Aflatoxin impacts and management
-
Upload
international-institute-of-tropical-agriculture -
Category
Science
-
view
158 -
download
3
Transcript of Aflatoxin impacts and management
![Page 1: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/1.jpg)
P
Aflatoxins Impacts & Management
Ranajit Bandyopadhyay IITA, Ibadan, Nigeria
EAC WORKING GROUP OF AFLATOXIN EXPERTS
11-15 MARCH 2013, ARUSHA, TANZANIA
![Page 2: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/2.jpg)
Food Systems
• Large Scale and Regulated – Developed countries
– Trade based
– Advanced infrastructure
– Capital intensive
Tim Williams, Peanut CRSP
Small Scale and Unregulated
– Developing countries
– Informal markets
– Subsistence
– High food insecurity
![Page 3: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/3.jpg)
www.iita.org
• Highly toxic metabolite produced by the ubiquitous Aspergillus flavus fungus
• The fungus infects crops and produces the toxin in the field and in stores
• Fungus carried from field to store
• Contamination possible without visible signs of the fungus
• Some predisposing factors:
– pre-harvest high temp and drought stress
– wet conditions at harvest and
post-harvest periods
– insect damage
Aflatoxin Facts
![Page 4: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/4.jpg)
www.iita.org
Aflatoxin Contamination Occurs in
Two Phases
Phase I: Before Crop Maturity
Developing crops become infected.
Associated with crop damage (insect, bird, stress).
Favored by high temperature (night) and dry conditions.
Phase II: After Crop Maturity
Aflatoxin increases in mature crop.
Seed is vulnerable until consumed.
Rain on the mature crop increases contamination.
Associated with high humidity in the field & store, insect
damage, and improper crop storage or transportation.
![Page 5: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/5.jpg)
Contamination is most severe at low elevations and during dry periods. During drought the zone with contamination expands.
35°N
35°S Zone with Perennial Contamination Risk
Aflatoxin Contamination: A Perennial Concern in Warm Climates
![Page 6: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/6.jpg)
Prevalence of Aflatoxins in Food & Feed
• Several African staple commodities affected
• High human exposure in Africa – mother to baby
• Levels and frequency of occurrence high
– >30% maize in stores with >20 ppb aflatoxin
– ~90% stores are contaminated with Afla fungi
– Up to 40% grain in households with aflatoxin
• Concern for food and feed processors, government and
emergency food reserve agencies, school-feeding
• Aflatoxins disproportionately impact the poor
• Highly toxic strains, conducive environmental
conditions, traditional farming methods and improper
grain drying and storage practices, unregulated markets
![Page 7: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/7.jpg)
International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
![Page 8: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/8.jpg)
www.iita.org
Aflatoxins in Food
District Samples Aflatoxin levels (ppb)
< 20 21 - 99 100 - 1,000 > 1,000
Makueni 91 35 13 40 12
Kitui 73 38 21 32 10
Machakos 102 49 25 23 3
Thika 76 66 17 13 4
TOTAL 342 47% 19% 27% 7%
Kenya – 2004 by CDC and Ministry of Health
![Page 9: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/9.jpg)
International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
Aflatoxin-albumin adducts (pg AFB1-lysine eq./mg albumin)
<5 5-25 26-100 >100
Nu
mb
er
of
ind
ivid
ua
ls (
%)
0
20
40
60
80
100 Gambia (n = 950)
Benin (n = 479)
USA (n = 48)
Europe (n = 74)
Aflatoxin Exposure in Africa,
Europe & USA
![Page 10: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/10.jpg)
International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
Aflatoxin Exposure in Africa
• Exposure to aflatoxin in sub-Saharan Africa is common and at high levels – important exposure occurs at the small subsistence farm level
• Exposure begins in utero and continues throughout life, with a reduced exposure during breastfeeding
• Exposure in young children is associated with impaired growth and development
• Under-nutrition and growth faltering is an underlying cause of 50% of deaths in children <5 years age (Black et al., Lancet, 2003)
![Page 11: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/11.jpg)
International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
Aflatoxin and Human Health
Death
Binds with DNA -- mutagenic
Type I carcinogen
Causes liver cancer – increasing incidence
Aflatoxin interacts with HBV
• 30 times more potent in HBV+ people
• 5-60 times higher cancer risk
• 40% of liver cancer cases linked to aflatoxin
Impede uptake and utilization of micronutrients in human systems
Associated with Kwashiorkor in children
Contributes to 40% of DALYs
![Page 12: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/12.jpg)
International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
Organs/Systems Effects
Gene and Gene
Expression
Teratogenic effect (birth defect)
Gene and Gene
Suppression
Carcinogenic effect—higher
incidence of cancer
Pathological changes Liver, kidney, and spleen
enlargement, fatty liver
syndrome
Immunosuppression Decreased resistance to
enteropathy, HIV, TB, and other
opportunistic infections
Aflatoxin Effect on Human Health
![Page 13: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/13.jpg)
International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
Aflatoxin & Stunting in Children
• Stunting - 40% more frequent in the high exposure zone
• 28% reduction in height gain
Aflatoxin exposure
group
AF-alb adduct
(pg mg-1)
Ht. increase*
(cm)
Lower quartile <23.3 5.88
Upper quartile >101.5 4.21
![Page 14: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/14.jpg)
Aflatoxin and HIV
• HIV increases the toxic effect of Aflatoxin (AF) by decreasing the levels of anti-oxidant nutrients that helps detoxify AF in the body
• For HIV virus to penetrate a cell it has to overcome the barrier of cell membrane & secretory IgA. AF reduces the level of secretory IgA thereby easing one of the barriers.
• In a large number of HIV cases there is a co-infection of HBV causing liver damages thereby potentiating the effects of AF
![Page 15: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/15.jpg)
International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
Animal Health Impact of Aflatoxin
Livestock and poultry losses
liver damage including cancer
recurrent infection due to immune system suppression
reduced growth rate
losses in feed efficiency
decreased milk and egg yield
embryo toxicity (reduced reproductivity)
death (cattle, turkey, poultry, swine..)
![Page 16: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/16.jpg)
www.iita.org
Aflatoxin and Poultry (Broilers)
Aflatoxin
levels in
feeds in
Nigeria
Aflatoxin level (ppb) Samples (%)
<20 (safe) 38
>20 to 100 (up to 5x) 14
>100 to 500 (up to 25x) 41
>500 to 1,000 (up to 100x) 7
AF-free diet 500 ppb AF diet
AF-free
diet
500 ppb AF diet
~40% reduction in
live weight (8 weeks)
![Page 17: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/17.jpg)
www.iita.org
Trade Losses due to Aflatoxins
• Nigeria and Senegal major groundnut exporters
in 1960s. Compliance has economic incentives
• Senegal: US$ 4.1 million added capital
investment and 15% recurring cost would attract
30% price differential to oil cake.
• Export would increase from 25K tons to 210K
tons.
• Increased export volume and price differential
would annually add $281 million value to
groundnut export for the capital investment.
• For confectionary groundnut, adherence to Good
Management Practices would increase export
value by US$ 45 million annually.
• Best quality exported; poorer quality consumed
domestically. Peanut
Maize
Coffee
Cocoa
Groundnut Pyramids in
Nigeria during 1960s Pyramids in Egypt?
World Bank; Mbaye (2004)
![Page 18: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/18.jpg)
International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
EU Rejections of Imports
According to Risks
SOURCE: EU Rapid Alert System For Food and
Feed (RASFF, 2005)
![Page 19: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/19.jpg)
www.iita.org
Trade Losses due to Aflatoxins
• Export compliance with food safety
and quality standards.
• Total losses: $1.2 billion
• World Bank estimate of unrealized
trade
– 2005 study: ~ Tens of millions of $
• Reasonable estimate: US$ 450 million
• Some countries active to meet
standards by putting in place relevant
institutions
• Best quality exported; poorer quality
consumed domestically. Peanut
Maize
Coffee
Cocoa
![Page 20: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/20.jpg)
Aflatoxin
Intervention
Medical
Agriculture
Surveillance
Enterosorption
Pre-harvest
Post-harvest
Crop resistance to fungal infection or
aflatoxin biosynthesis
Biocontrol e.g. nonaflatoxigenic strains
Reduce crop stress- irrigation,
Insecticides, fungicides
Improved drying, sorting, insect control
and storage
Detoxification, e.g., ammoniation
Alternative uses
e.g. Novasil clay
Agriculture & Medical Prevention of Aflatoxin-
related Food Security and Health Effects
(Adapted from Wild and Hall, Mutation Res., 2000)
Awareness
Regulation
Provision of safe food
Early diagnosis
![Page 21: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/21.jpg)
Agriculture Based Prevention of Aflatoxin-
related Food Security and Health Effects
• Pre-harvest
– Resistant cultivars, if available
– Biological control, e.g., aflasafe
– Irrigation and water conservation practices
– Lime and FYM application
• Post-harvest
– Sorting
– Insect control
– Improved drying and storage
– Detoxification, e.g., ammoniation
– Alternative uses including blending
![Page 22: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/22.jpg)
www.iita.org
334 396 400 488 800 809 816 956
5474 5671
6438 6087
5685
7115
6040 5891 5743
5662
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
Hybrids
Aflatoxin (ppb)
Grain yield (kg/ha)
Afl
ato
xin
(p
pb
)
Gra
in y
ield
(kg
/ha)
Less Aflatoxin Susceptible, High-
Yielding Yellow Maize Hybrids
Less toxin – high yield
![Page 23: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/23.jpg)
www.iita.org
Aflatoxin (ppb) in Low-Aflatoxin
Maize Lines With and Without
Aflasafe Treatment
Experimental variety
At harvest
Control Treated
RSYN2-Y 19.6 1.7
RSYN3-W 6.9 1.8
SYN3-Y 18.4 1.7
TZB-SR (susc.) 57.5 4.7
After poor storage
Control Treated
462 44
627 38
387 19
1152 163
![Page 24: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/24.jpg)
www.iita.org
Experimental varieties
Aflatoxin reduction (%)
Resistance alone
Biocontrol alone
Resistance + Biocontrol
RSYN2-Y 66 (60) 91 (90) 97 (96)
RSYN3-W 88 (46) 74 (94) 97 (97)
SYN3-Y 68 (66) 91 (95) 97 (98)
TZB-SR (Susc.) 58 (1152) ppb 92 (86)
% Reduction in experimental varieties compared to susceptible variety (TZB-SR) under natural conditions
% Reduction in varieties with biocontrol compared to susceptible variety (TZB-SR) under natural conditions
% Reduction in biocontrol treated plots compared to control plots of the same experimental variety
% Reduction in varieties with biocontrol compared to susceptible variety (TZB-SR) under natural conditions
% Reduction in biocontrol treated plots compared to untreated plots of the same variety
Synergistic Effect of Resistance and
Biocontrol in Reducing Aflatoxins at Harvest and after poor storage
![Page 25: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/25.jpg)
Contaminated Crops have Uses and Can be Valuable
Markets are needed to provide value to crops unsafe for human consumption
US FDA
Action Level
Permitted Use
(Examples)
500 ppb Middleman (Blender)
300 ppb Finishing Beef
200 ppb Finishing Swine
100 ppb Breeding beef and
swine; mature poultry
20 ppb Human Food, Feed
0.5 ppb (M1) Milk
![Page 26: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/26.jpg)
Ammoniation is Highly
Effective in
Eliminating Aflatoxin
![Page 27: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/27.jpg)
Trade Based Prevention of Aflatoxin-related
Food Security and Health Effects
• Awareness campaigns to increase demand for aflatoxin safe products
and incentivize adoption of aflatoxin control strategies along the value
chain
• Upgrade food control system
• Enhanced laboratory capacity and availability of rapid test kits, trained
users, documentation of results and withdrawal of contaminated
products
• Improved trader compliance with national regulatory codes
• Create a commodity exchange system such as warehouse receipts
• Improve enforcement mechanisms for domestic, import and export
trades
![Page 28: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/28.jpg)
www.iita.org 28
Awareness and Training
![Page 29: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/29.jpg)
Branding for Aflatoxin Testing as a Case for Self-Regulation
![Page 30: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/30.jpg)
Breeding Tens of Millions of dollars spent for over 40 years… No results
Exceptionally difficult problem due to complex trait
Leading international seed companies given up
Storage Pre-harvest problem, that can be made worse post-harvest
Toxic levels exist at harvest… Garbage in garbage out
Studies
• Health
• Economics
• Trade
Already regulated to the most stringent standards globally; 0.05 ppb in milk
26 animal studies have proven health effects; Why test on African children
Prevalence and severity can shift 100 fold in one year
Fungus likes warm, humid places… A.K.A, African Tropics
Aflatoxin reduces the revenue potential of poor farmers
Alternative
uses
A critical piece of the puzzle, but is NOT a solution
Alternative uses would by default create a lower price market
Must first control, or volumes would be too large to be sustainable
Biocontrol Proven, Cost Effective Solution
Solves the problem at it’s root cause
Dedicated team of African and International partners
Builds on over a decade of work to fin real solution for Africa
![Page 31: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/31.jpg)
www.iita.org
Aflatoxin Problem Starts in the Field
0
20
40
60
80
100
120
140
160
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Farmers
Afl
ato
xin
(p
pb
)
792 309
2010: Maize
64% fields above 20 ppb at harvest in northern Nigeria
Increases in stores; interventions required in field and stores
![Page 32: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/32.jpg)
www.iita.org
Texas 2010: At harvest this field’s grain contained 400 to 1200 ppb aflatoxins
![Page 33: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/33.jpg)
www.iita.org
AF36
Aflaguard
Biocontrol WORKS
In 100’S of thousands of acres in
the US!
IT WORKS In Africa
TOO!
Aflasafe
![Page 34: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/34.jpg)
www.iita.org
From an article in Southwest Farm Press by Ron
Smith published October 24th, 2011 in which Ron
interviews Dr. Jim Swart, Integrated Pest
Management Specialist, Texas A&M based in
Commerce, Texas
• In spite of 40 years of research, no
aflatoxin resistant cultivars are
available commercially
• Biocontrol is the only viable solution
used by farmers
![Page 35: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/35.jpg)
Strong Partnership
www.iita.org
• IITA
• USDA
• AATF
• BMGF
• Doreo Partners
• KARI
• Several African institutions Training is an important
component
![Page 36: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/36.jpg)
www.iita.org
Aflatoxin Mitigation by Native
Beneficials: Principles In nature, some strains produce a lot
(toxigenic), and others no aflatoxin
(atoxigenic)
Atoxigenic strains identified from
nature, introduced in a carrier, and
applied in fields to exclude toxigenic
strains
Shift strain profile from toxigenic to
atoxigenic
Thus, aflatoxin contamination reduced
Strains move from field to stores
Multiple year carry-over effect
We identify and promote only native
beneficial strains
0
25
50
75
100
Natural Biocontrol
Incid
en
ce (
%)
T
O
X
I
G
E
N
I
C
A
T
O
X
I
G
E
N
I
C
S Strain A. flavus L Strain or “typical” A. flavus
On average, S strain isolates produce much
more aflatoxin than L strain isolates.
![Page 37: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/37.jpg)
www.iita.org
Atoxigenic Strain Identification
Collection/characterization Toxin assay
Lab
competition
assay
VCG/DNA characterization
cnx nia-D
Unknown 2
+
![Page 38: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/38.jpg)
Pre-field selection criteria
does not produce aflatoxin
can genetically not produce aflatoxin
can genetically not produce CPA
outcompetes toxigenic strains
belongs to different clonal lineages (SSR)
VCG with wide geographic distribution in country
VCG does not contain a single toxigenic member
~12 native strains are tested in the field
![Page 39: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/39.jpg)
Selection of 4 strains
selection criteria:
superior capacity
to colonize,
multiply and
survive
superior field
efficacy in
reducing aflatoxin
www.iita.org
4 native strains formulated
into a registered product
![Page 40: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/40.jpg)
NAFDAC officials inspecting maize fields treated with AflaSafe
![Page 41: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/41.jpg)
Product: Aflasafe
Mixture of 4 native atoxigenic strains
Nigeria
![Page 42: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/42.jpg)
How Does aflasafe Work?
Broadcast @ 10 kg/ha 2-3 weeks before flowering
Sporulation on moist soil
Spores
Insects
Aflasafe in 5 kg boxes
3-20 days
Wind
Soil colonization
30-33 grains m-2
Fungal network in killed grain
![Page 43: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/43.jpg)
www.iita.org
Farmers treating maize and groundnut fields with Aflasafe in Nigeria
MAIZE: Aflatoxin reduction (%)
Stage 2009 2010 2011
Harvest 82 94 83
Storage 92 93 x
PEANUT: Aflatoxin reduction (%)
Stage 2009 2010 2011
Harvest - 95 82
Storage 100 80 x
Results from 382
on-farm trials
71% and 52% carry-over of
inoculum 1 & 2 years after
application
![Page 44: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/44.jpg)
www.iita.org
0
10
20
30
40
50
60
70
80
90
untreated fields treated fields
reco
ve
ry o
f re
lea
se
d
ato
xig
en
ic s
train
s (
%) soil before inoculation
soil at harvest grain at harvest
Recovery of Atoxigenic Strains from
Treated and Untreated Fields
![Page 45: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/45.jpg)
www.iita.org
Aflatoxin Reduction in 4 zones 4
Months after Poor Storage in Nigeria
0
200
400
600
800
Birnin Gwari Lere Maigana Pampaida
Afl
ato
xin
(p
pb
) Control
Treated
96
14
271
49
646
17
171
9
85% 82% 99% 95%
% reduction in aflatoxin reduction in treated fields over control
Mean
reduction
90%
Moist conditions may lead to moulding of feed
Aflasafe-treated maize: non-toxic strains grow
Non-aflasafe maize: mostly toxic strains grow
![Page 46: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/46.jpg)
75
94 100
0 3
39
73
27
100
80
60
40
20
0
<4 <10 <20 >20
EU WFP US unsafe
maximum allowable aflatoxin level (ppb)
farm
ers'
fie
lds
(%)
Aflasafe
untreated
Productivity increased of communities in
aflasafe-treated areas
DALYs saved: 103,000 - 184,000 cost-effectiveness ratio: 5.1 - 24.8
Source: Felicia Wu, Pittsburgh Univ.
www.iita.org
Impact of Aflasafe on Trade and Health
![Page 47: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/47.jpg)
Aflasafe Development in Kenya
• More than 3,400 isolates recovered from 263 maize samples obtained between 2004 and 2006 from the Eastern, Coast and Rift Valley
• 11 atoxigenic VCGs (13 strains) repatriated to Kenya and tested in three experimental stations.
• Reduced aflatoxin contamination in on-station trials by 88%
• Four selected and formulated as aflasafe KE01
• 4.5 tons inoculum shipped from Nigeria to Kenya
• 240 efficacy trials completed in farmers’ field in 2012; 200 more in 2012/2013
![Page 48: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/48.jpg)
Plots
Observed
aflatoxin
Apparent
reduction
Applied
VCGs
in Control
Aflatoxin if
Applied VCGs
not Present
Actual
Reduction
Treated 17 ppb
64% 88%
Control 49 ppb 66% 143 ppb
Data Measured Calculated Measured Calculated Calculated
Apparent Versus Actual Reductions in Maize Aflatoxin
Content, Bura Irrigation Scheme, 2011
Observed Aflatoxin = Quantity of total aflatoxin measured in the harvested crop.
Apparent Reduction = Calculated from the Observed Aflatoxin = [1 – (Treated Observed Aflatoxin ÷ Control
Observed Aflatoxin)] x 100.
Percent Applied VCGs in Control = the percent of the overall A. flavus community on the harvested crop composed
of the applied atoxigenic VCGs. Measured by performing Vegetative Compatibility Analyses on isolates from the
harvested crops.
Toxin if Applied VCGs not Present = Control Observed Aflatoxin ÷ [1 – (% Applied VCGs in Control ÷ 100)].
Actual Reduction = [100 – (Treated Observed Aflatoxin ÷ Aflatoxin if Applied VCGs not Present)] x 100.
![Page 49: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/49.jpg)
www.iita.org Farmers treating groundnut fields with
AflaSafe
Aflatoxin Reduction:
2010 : 87% at harvest; 89% after Storage
2011: 82% at harvest; 93% after Storage
Senegal
38 Farms Treated in 2010
40 Farms Treated in 2011
196 Farms Treated in 2012
![Page 50: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/50.jpg)
Area-wide application: 196 Farms Treated in 2012
![Page 51: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/51.jpg)
La
Capacity Development
Laboratory infrastructure
• Burkina Faso
• Kenya
• Zambia
Human Technical capacity
• Senegal
• Ghana
• Cameroon
• Tanzania
• Nigeria
![Page 52: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/52.jpg)
![Page 53: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/53.jpg)
53
Awareness and Training
![Page 54: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/54.jpg)
![Page 55: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/55.jpg)
B
Ownership and Advocacy by the Nigerian Government
Billboard Interactive Forum
A commercialization strategy for distribution and adoption being piloted Consider Aflasafe as public health intervention for aflatoxin
![Page 56: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/56.jpg)
Policy Statement by the Honorable Minister of Agriculture, Nigeria
Various Nigerian stakeholders have developed a 5 year, 4 step commercialization plan. All parties involved, IITA, Doreo, and the government, have critical roles to play over the next five years to ensure that Aflasafe treated food crops are successfully introduced into the market.
When we consider the potential benefits of Aflasafe, it is ultimately the smallholder farmer who stands to gain the most benefits. Farmers consume 65% of the maize they produce thus they stand to benefit the most from the improved health benefits of Aflasafe maize. Trading in Aflasafe products also increases smallholders’ opportunity to access premium and foreign markets where the product is in demand.
![Page 57: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/57.jpg)
How do we Generate Demand in the Medium-Term
• Develop manufacturing capacity
• Create awareness about aflatoxin
• Demonstrate efficacy of Aflasafe
• Incentivize use of Aflasafe by the poor
• Train farmers in aflatoxin management
• Enable aflatoxin testing of products
• Link Aflasafe users to food and feed market
• Being piloted by Doreo Partners
![Page 58: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/58.jpg)
Babban Gona Franchise Pilot
• Farmers’ cooperative with professional management
• Credit, inputs and technical services
• Yield enhancing practices
• Aflasafe use
• Aflatoxin testing – 100% met standard
• Incentive for meeting aflatoxin standard
• Warehousing
• Output marketing – linking to market
• Return profit after sale
• Farmers keep part of the harvest for family use
![Page 59: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/59.jpg)
Poultry feeding study
• Stakeholders’ meeting on 15 Jan
• Poultry producers with farmers’ groups on one platform
• Build relationships and create sustainable market
![Page 60: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/60.jpg)
Farmers’ Willingness to Pay
100% 99%
83%
60%
25%
19%
34% 31%
18%
12%
5% 4% 0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
$0 $3 - $6 $6 -$9 $9 - $12 $12 - $15 $15 - $19 $20
Farmers who have used Aflasafe (n=246) Farmers who have not used Aflasafe (n=119)
Target Farm Gate Price
Range
Source: Godwin Okpachu & Tahirou Abdoulaye
• 365 farmers in Kano and Kaduna interviewed in Nigeria
• All prior-users willing to pay; almost 50% non-users willing to pay
• Prior-users willing to pay more than non-users
![Page 61: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/61.jpg)
AF36 manufacturing facility Arizona Cotton Research & Protection Council, USA
Innovative Product, Excellent Efficacy……. SCALING!
Manufacturing facility in
Africa is the missing piece for SCALING
![Page 62: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/62.jpg)
Aflasafe plant in Nigeria (under construction)
Capacity:
5 tons/hour OR
4,000 ha per shift
![Page 63: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/63.jpg)
• G20: Aflasafe incentivization selected for implementation in Nigeria
• Aflasafe will be used by smallholder farmers in 200,000 ha
![Page 64: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/64.jpg)
Strategic Plan to Drive Sustainability Leverage Strong Regulatory Enforcement to Sustain Premium Market for Aflasafe maize
64
1
Year
2 3 4 5
PACA and Pull Mechanism Generate Supply of
Cost Effective Low
Aflatoxin Maize
Enforce Regulatory
Policy
Enable Market
Forces to Drive
Sustainability
Promote Health
Awareness to Value
Chain Actors
Policy:
Build
Regulators
Capacity
Policy:
Develop
regulatory
framework
Policy: Phased in regulatory enforcement mechanism
Market Forces
Health Awareness: Farmer Focus
Health Awareness: Industry
Focus Health Awareness: End Consumer
1
2
3
4
![Page 65: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/65.jpg)
Partnerships are Key: Nigeria
• USDA-ARS, IITA, Universities of Ibadan and Bonn: Technology development
• GTZ/AATF/EU/BMGF: Funds
• Doreo Partners: Commercialization
• AATF: Intellectual propriety
• USDA-FAS: Registration
• NAFDAC: Regulation, monitoring
• Ag Dev Program (extension): Testing/promotion/awareness
• Maize Association of Nigeria: Promotion/awareness
• Ministry of Health: Promotion/awareness
• Ministry of Agric: Promotion/awareness
• Nigerian Mycotoxin Society: Awareness
• Commercial Ag Development Program: Testing/awareness
• Millennium Village Program:
Testing/awareness
• Nestle: Market
• Babban Gona: Commercialization
• Obasanjo Farms: Poultry Study
• Poultry Association of Nigeria: Market
• UNIDO: Promotion/investor forum
• Nigerian Export Promotion Council:
Promotion/investor forum
• NEPAD Business Group: Promotion/investor
forum
• Nigerian Economic Summit Group:
Promotion/investor forum
• Bill and Melinda Gates Foundation:
Promotion/commercialization
![Page 66: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/66.jpg)
National Products
www.iita.org
Products ready for registration
Products under testing in farmers’ fields
Strain development to start or in progress
Aflasafe-NigeriaTM
Aflasafe-SenegalTM
Aflasafe-KenyaTM etc…
Aflasafe-WestTM
Aflasafe-EastTM
Aflasafe-SouthTM
Regional Products
Senegal Mali
Burkina
Ghana
Nigeria
Kenya
Tanzania
Mozambique
Zambia
![Page 67: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/67.jpg)
Aflatoxin Biocontrol Facts
Crops are infected by complex
communities of diverse fungi Fungal communities differ in aflatoxin-
producing ability & this influences crop
vulnerability to contamination. Atoxigenic
strains can be used to reduce aflatoxin-
producing ability.
There are many atoxigenics Select safe strains best adapted to cropping
systems, ecosystems, & climates
Atoxigenics are Already
Present on the Crop Just increase the frequency of endemic
strains & natural interference with
contamination
Treatments May have
Long-Term Influence
& Cumulative
Benefits
More than One Crop
May Benefit From
the Applied Strain
Atoxigenic Strains can
be Applied Without
Increasing Infection and without increasing the overall
quantity of A. flavus on the crop &
throughout the environment
![Page 68: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/68.jpg)
Summary • Aflatoxins in food and feed pervasive in Africa
• Biological control in conjunction with other management practices can dramatically reduce aflatoxin contamination
• Efforts underway to pilot commercialization of aflatoxin biocontrol and develop regional strains
• Technologies available but must be implemented to reduce aflatoxin burden in African economies and food system
• Support and partnership needed from national governments, regulators, donors/investors, private food/feed sector and farmer groups
![Page 69: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/69.jpg)
![Page 70: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/70.jpg)
IITA Aflasafe Team
![Page 71: Aflatoxin impacts and management](https://reader034.fdocuments.net/reader034/viewer/2022042608/55ca8c33bb61ebdf648b45e2/html5/thumbnails/71.jpg)