Strategic pest management tactics for blackheaded fireworm using reduced risked ovicide/larvicide...
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Transcript of Strategic pest management tactics for blackheaded fireworm using reduced risked ovicide/larvicide...
Strategic pest management tactics for blackheaded fireworm using reduced risked ovicide/larvicide insecticides
Kim Patten & Chase Metzger
Background:• In 2015 the Washington Department of Agriculture will most likely
ban the use of OPs on 56% of cranberry beds in WA, due to water quality issues.
• Alternative reduced risk chemistries for fireworm control have been getting adopted by the industry, but control hasn’t always been satisfactory.
• There are a lot of new reduced risk insecticides that we are only beginning to figure out how to best use.
• Most applications are chemigated on systems with poor uniformity (DU< 70%) which compromise efficacy
• Our insect pests have a very asynchronous hatch (3+ weeks) which make insecticide timing more challenging
Grower survey July 2013 on their satisfaction with Altacor
never used moderately satisified
very satisified unsure
Blackheaded FirewormRhobobota naevana
2 generations / yearOverwinters as egg
Project objectives:• Assess an array of new insecticide for efficacy against fireworm• Assess duration of field efficacy• Optimize timing intervals • Develop more refined IPM program for fireworm management
1st generation BHFW efficacy trials
ControlIntrepid
AltacorCloser SC
Flubendimide
0102030405060
# alive larvae per sets of 5 sweeps
Applied 5/11 assessed 5/13 and 5/20
a
bb
ab
2nd generation BHFW efficacy trials
ControlVenerate
GrandevoDanitol
Altacor
05
1015202530
# alive larvae per two sets of 5 sweeps
a
b b
a a
Applied 7/21 assessed 7/25 & 7/29larvae size equally distributed between 1 and 5 instar
Duration of field efficacy – fireworm 2nd generationTreatments were applied weekly (5/27 to 6/26)
Which applications failed to provide control?
Treatment window
Sweep for efficacy
Duration of field efficacy – fireworm 2nd generation5 different timings (5/27 to 6/26) – how long do they provide control?
5/27/2013 6/6/2013 6/16/2013 6/26/2013 7/6/20130
2
4
6
8
10
12
14
16
AltacorIntrepid# larvae per 5
sweeps on 7/8/2013
Plots swept for efficacy
ab
ab
c
c c
ab
5/27/2013 6/6/2013 6/16/2013 6/26/2013 7/6/20130
100200300
BHFW adults trap counts
33 days of control w/ Altacor19 days of control w/ Intrepid
Spray dates
1 161
a
ab
5 days exposure10 DBE 5 DBE 1 DBE 1 DAE 5 DAE 10 DAE
Container of cranberries treated with Altacor or Intrepid before or after exposure to fireworm adults and assessed for damaged
DBE - days before exposureDAE – days after exposure
10 DBT 5 DBT 1 DBT 1 DAT 5 DAT 10 DAT0
20
40
60
80
100
AltacorIntrepid
% c
onta
iner
s w
ith fi
rew
orm
dam
age
ab
ab
ab
5 day ex-
posure
a
b
b
b b b
b b
Data – highly variable Intrepid applied pre-egg laying – minimal controlAltacor applied pre or post-egg laying - control
Timing window
Timing window
With new reduced risk insecticides – what is the ideal timing and frequency? Do you get any ovicidal activity?
Do you get any adulticidal activity? How long is the duration of field activity?
Pre-hatch application of insecticide for control of 1st generation BHFW
Control Intrepid Altacor0
5
10
15
20
25
30
35
31
0 0
21.5
0 0
# alive larvae per 5 sweeps
May 6th sweeping May 17th sweeping
Treatments applied May 30, 2013 –at early rough neck ~ 1/4” growth; no larvae present
Early timing for 1st generation provides superlative control, even under high pressure(17 days of control)
a
a
b b b b
Treat sweep
0
2
4
6
8
Control Altacor Intrepid Cyazypyr
# alive fireworm per 10 sweeps23-Jul 3-Aug
Treatments applied 6/11/12 at first significant moth flight
a
a
aa
abab
ab
Treat sweep
Total # alive BHFW larvae
# o
f larva
e/ 5
sweep
s
0
10
20
30
40
50
untreatedDelegateAltacorCyazypyr
6/24 7/8 7/22 8/7
Treat sweep
treat sweep
0
10
20
30
40
50
Control Altacor Intrepid Cyazypyr
# alive fireworm per 5 sweeps16-Jul 23-Jul
Treatments applied 6/29/12 just prior to egg hatch
a
b
a
ab bab
b
Treat sweep
Develop more refined IPM program for fireworm management• Refinement of trapping• Use of trap data with GDD models• Consideration of additional insect pest• Resistance management
• Comparison of Apples to Cranberries in the PNW– 2nd generation Codling moth larvae
• Altacor: ~120 to 150 dd base 10˚C from biofix • Intrepid: ~130 to 150 dd base 10˚C from biofix
– 2nd generation larvae Fireworm larvae• Altacor: ~110 to 150 dd base 10˚C from biofix • Intrepid: ~130 to 140 dd base 10˚C from biofix