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Ambrosia artemisiifolia L.Common ragweed
Biology
! Family: Asteraceae
! Life Span: summer annual
! Photoperiode: shortening-day
! Germination: late spring – to early summer
! Growth height: up to 2.5 m (highly plastic)
! Growth rate in first month: up to 20 mg d-1 (soybean: 8-12 mg d-1)
! Male inflorescence: mid of July
! Main flowering season: August – September" up to 8 bn. pollen/plant
! Competitive power: medium but very high plasticity " plants can adapt to almost
all environmental conditions
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! Per gramm biomass dry matter 177 flowering heads are developed on average
! Per gramm biomass dry matter 23 female agglomerations are developed which
contain 5 to 20 seeds on average
More biomass = more pollen and seeds
Flowering Heads: R²=0.63; p < 0.001 Female Agg.: R²=0.64; p < 0.001
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Development steps
week 1 week 2 week 3 week 4
week 5 week 6 week 11
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Distribution pathways
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Spread across Europe and Austria
! First appearance of the plant in Western Europe was documented in Pfaffenberg
(Brandenburg, Germany) in the year 1863
! Main naturalization and establishment of the plant in Europe occurs after WW II (Kazinczi et al., 2008)
! The geographical route of distribution can be traced back to harbors like Rijeka,
Trieste and Genoa (Comtois, 1998)
! In Austria, a steady spread of the plant was observed since the 1960ies, primarily
along the high-capacity road system (Karrer, 2007; Kazinczi et al., 2008)
! Particularly, agricultural machinery and implements of the road maintenance services
contribute substantially to the further transmission of the seeds (Vitalos und Karrer, 2009)
! Natural distribution along riverruns and through soil movement
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Economic impact
! Infestation of crop fields with ragweed can cause harvest losses
between 20 and 70 %, depending on the crop
(Bullock et al., 2010; Novak et al., 2009)
! Yield losses in oil seed pumpkin can rise up to 70 % (Kazinczi et al., 2008)
! 3 plants per squaremetre decrease photosynthesis performance of soybean by
approx. 30 % (Coble et al., 1981)
! Proteins in the ragweed pollen have strong allergenic effects. They were identified to
be a significant cause of allergic rhinitis and hay fever during late summer and autum.
! In Austria, annual cost per person concered are estimated at 630 € >> in Austria
approx. 1 mio. people are affected by ragweed pollen (LK Steiermark, s. a.)
>> in 2016 social cost due to ragweed allergy exceeded the 100 Mio. € mark (Medical University Vienna)
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The seeds = the factor of success
! Fruit = achene, covered by a dry spiny involucrum
! Average seed production: ø 1.000-3.000 seeds/plant
(max. 62.000; Kazinczi et al., 2008; Fumanal et al., 2008)
! Ripening: from September onward
! Primary dormant seeds
! Stratification (4°C – 8 weeks; Willemsen & Rice, 1972)
! Soil seed bank: persistent >> seeds can remain germinable
in soil up to 40 years (Toole & Brown, 1949)
! > several studies indicated that viability and vitality decrease
constantly, even under constant storage conditions(Long et al., 2015; Ratajczak et al., 2015)
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Burial trial
! Within the HALT Ambrosia project a long-term experiment was
conducted to test seed longevity of ragweed seeds from 2 different
origins in 2 different depths (5 and 25 cm)
! Seeds were enclosed at portions of 50 in fine polyethylene nets
! Since 2012, every year in early spring a randomly chosen subset of 5 nets per depth
layer are digged out at all sites (until 2022)
! Intact seeds were counted and tested for viability by germination test and subsequent
TTC-test
Main questions:
! Do seeds of common ragweed in lower or in upper soil layers decay faster?
! Do seeds of common ragweed decay faster in soil than under controlled conditions?
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Burial depth
- 4.6 % - 19.2 % - 41.6 %
! Mean values of 3 different
European labs which
participated in this joint-trial
! With the Austrian population a
significantly higher degradation
rate was monitored in the lower
soil layer (25 cm)
! No significant differences were
detectable with the Hungarian
seeds
! Highest degradation rate was
observed under controlled
storage (4°C in darkness)
Au
stri
aH
un
gar
y
- 7.0 % - 5.1 % - 9.6 %
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
2012_5cm 2016_5cm 2012_25cm 2016_25cm 2012 Control 2016_Control
Via
ble
see
ds
[%]
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
2012_5cm 2016_5cm 2012_25cm 2016_25cm 2012 Control 2016_Control
Via
ble
see
ds
[%]
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Very high adaptive capacity
! Very high flexibility in terms of growing and environmental conditions
! High tolerance against: salt, heavy metals, nutrient deficite, drought
and contaminants like tyre abrasion
! Different life cycle compared to other (native) plant species >> ragweed
can evade common/typical management regimes
! actually existing management systems promote establishment, growth
and spread of ragweed (i.e. mowing regimes along road verges)
! Very high regenerative capacity after management intervention
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Further problems in controlling ragweed
! almost no effective herbicides particularly with crops like soybean, potatoe, different
kinds of vegetables, sugar beet and grassland
! particularly along road verges and railways herbicide application is often not allowed
due to environmental and human health issues
! very quick development of resistancies (4 years with glyphosate)
! on ruderal areas and low-interest-sites (dumps, landfill sites, hedges, timer
stockyards, field paths etc.) an effecitive management would be completely
uneconomic and unfeasable
! conflicts of competence
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GOAL: Road sidesDevelopment of a management system, which
significantly reduces/prevents the further spread of
ragweed
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Status quo
The most common mowing regime in Austria and Germany
! 1. Cut (April/May): competitive plants are removed/damaged
>> ragweed can germinate freely
! 2. Cut (end of June): kif ragweed has grown high enought (min. 5 mm) the plants are damaged
instead of apical growth the plant switches to basal growth = more stems, more males more seeds
! during summer native plants reduce their growth to a minimum, whereas ragweed continue to
grow due its high tolerance against heat and drought
! no cutting event during summer (holidays etc.) >> ragweed can develop pollen and seeds
almost undisturbed
! 3. Cut (September/October): ragweed seeds are ripe and are further spread by mowing- and
mulching machinery (up to 90 seeds per 100 g biomass)
! Further aspect: road construction >> distribution of seeds with contaminated soil
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Treatment 1: no mowing (control)
Treatment 2: 1. Cut: last week of June (before the start of the flowering)
2. Cut:: second week of September
Treatment 3: 1. Cut: third week of August (after the beginning of flowering)
2. Cut:: second week of September
Treatment 4: 1. Cut: last week of June (before the start of the flowering)
2. Cut: last week of July (before mass flowering)
3. Cut:: second week of September
Treatment 5: 1. Cut: last week of June (before the start of the flowering)
2. Cut: third week of August (after the beginning of flowering)
3. Cut:: second week of September
Experiment to find the optimum cutting regime (2009-2011)
5 mowing regimes – 7 sites
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Number of male flowers
! During all 3 years, road verges under cutting treatment 4 showed the significantly lowest
number of male flowers (= pollen)
! Treatment 4: last week of June / last week of July / second week of September
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Seed production
! During all 3 years cutting treatment 3 and 5 were the best choice to reduce seed
production
! Treatment 3: third week of August / second week of September
! Treament 5: last week of June / third week auf August / second week of September
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Soil seed bank
! After these 3 years it became obvious that treatment 3, 4 and 5 are most suitable to
deplete the soil seed bank
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GOAL: Agriculture & Nature
conservationDevelopment of crop rotation systems and farm
routines which prevent the further spread of
ragweed
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83
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14.08.1
8
84
One single seed contamination event is enough to infest a site (agricultural field,
meadow etc.) sustainably.
Each seed which enters our fields today is a potential threat until the year 2038!!!
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BFFs: sugar beet & ragweed
! Special dispersal dynamic in interaction with sugar beet
! almost no negative effect on yield >> no special interest to eradicate the plant
BUT: ragweed and sugar beet show a temporal uniform ripening and are
therefore „harvested“ at the same time
! The majority of sugar beets are harvest at a time when the majority of ragweed
seeds have already ripened and have fallen from the mother plant
>> under moist field conditions (October onwards) the huge beet lifters carry –
besides the sugar beets – a lot of soil and ragweed seeds with them
! one counting of BOKU showed a contimation of 7.500 seeds/harvest machine in
a medium-contaminated field
! particularly successfull vectors ragweed seeds are machinery contractors
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86
beet storage
place in
Raasdorf
(Lower Austria)
autumn 2017
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Registered herbicides & their efficacy (Bayerische Landesanstalt für LW, 2016)
PRE-EMERGENCE EARLY POST-EMERGENCE(Ragweed BBCH 12-14)
LATER POST-EMERGENCE(Ragweed BBCH up to 59 before flowering)
Goltix 700 SC (Metamitron)
Click (Terbuthylazin)
Arelon Top (Isoproturon)
Sencor WG (Metribuzin)
Biathlon (Tritosulfuron)
Starane XL
(Fluroxypyr)
Pointer (Tribenuron)
Lontrel (Clopyralid)
Callisto (Mesotrione)
Clio + Dash
(Topramezone)
Mais Banvel WG
(Dicamba)
Certrol B (Bromoxynil)
Roundup (Glyphosat)
Starane XL
(Fluroxypyr)
Lontrel (Clopyralid)
U46 M-Fluid (MCPA)
U46 D-Fluid (2,4 D)
Mais Banvel WG
(Dicamba)
Certrol B
(Bromoxynil)
Simplex (Fluroxypyr)
Roundup (Glyphosat)
Results
Click, Arelon Top und Sencor WG
prevent the germination of ragweed
Callisto und Clio (4-HPPD-inhibitor)
showed a 100% efficacy
limited success of Simplex and
Roundup (70-80 %)
Goltix 700 SC reduced ragweed
germination only by 35 % compared
to the untreated controll
Certrol B first showed a very good
effect but promoted new growth a few
days after application
even though Starane XL showed
quite good results in the early post-
emergence, there was only a small
effect on the ragweed plants later on
Sulfonylurea-herbicides like Biathlon
und Pointer SX showed no significant
effect on ragweed plants
all other herbicides showed no effect
Compounds for herbicide treatment in wheat, maize, sugar beet, potato and grassland
Soybean: only one registered herbicide (Pulsar 40 (Imazamox)) with medium-efficacy
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ALTERNATIVE APPROACHES
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Competitor seed mixturesmulit-trait limiting similarity theory
Yanelli, Karrer & Hall, 2017
AA SG
Betonica officinalis
Campanula rotundifolia
Centaurea scabiosa
Dactylis glomerata
Galium album
Linum perenne
Medicago lupulina
Peucedanum oreoselinum
Teucrium montanum
Veronica chamaedrys
Achillea millefolium
Agrostis capillaris
Buphthalmum salicifolium
Campanula rotundifolia
Dactylis glomerata
Festuca rubra
Galium album
Poa pratensis
Veronica chamaedrys
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Volatile organic coumpounds (VOCs)Plant-to-Plant-Interaction
! Living plants emit VOCs from organs (leaves, roots etc.) in their surrounding environment but
also dead plant residues can release allelopathic substances
! Today, more than 1,700 VOCs have been identified, most of them having the ability to inhibit or
stimulate growth of other plants
! Competition between plants has been recognized as one of the most important factors affecting
growth of individuals and the distribution of species (chemical behaviour)
! Enemy release hypothesis states that invasiveness of non-native species like ragweed can
result from a loss of natural enemies due to the production of toxic compounds (i.e. growth
inhibitors) that unfavorably affect native communities >> native plants are unable to tolerate
compounds released by a non-native plant due to missing co-evolution in the same environment
! Ragweed: 53 compounds, 10-15 active; toxic substances like neurotoxines, as well as positive
substances like substances having the potential to cure haemorrhoides
Communication is no one-way-street
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Ophrealla communa
! 3-4 mm long
! Caput is yellow with a black spot on the back
! fluffy
! temperature optimum: 25-28°C
! native to North America too
! up to 6 generations per year
! favorite food: ragweed >> all life stages (eggs, larvae, adults) live on the plant and
have therefore the potential to harm it severely
! BUT: What happens when the beetle has eradicated all ragweed?
! Next possible snack bars: sunflower and other Asteraceae (nature conservation
issues???)
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How to manage the Ambrosia plant?
1) Depletion of the soil seed bank
2) Prevention of seed formation and avoidance of further spread of existing seeds
! Bare fallow with shallow soil management to „motivate“ seeds to germinate
proper monitoring and management of this stands are essential
>> very useful for smaller sites with low-medium seed contamination as approximately
85 % of the seeds germinate the year after ripening
! targeted soil management against ragweed (hoeing, grooming etc.) is possible until
BBCH 18 (crops) only >> after that: uprooting if possible
! Mulch sowing (weed suppressing effect)
! as viability slowly but steady decreases, farmers should focus on competitive autumn-
sown crops (wheat, rape seed etc); particularly on heavy contaminated fields spring-
sown crops like soybean or sunflower with low competitive power should be avoided
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How to manage the Ambrosia plant?
! targeted actions against ragweed not only along roadside verges and agricultural
fields but also on low-interest-sites (ruderal areas)
! Attention: high regenerative capacity >> a regular monitoring of the areas after the
management event is essential >> in most cases repetitive actions are necessary
since „under pressure“ the plant can build up new seeds within 5 weeks
! Dirty machinery (soil/biomass etc) should be cleaned each time before the enter a
new field/road/ruderal area
! Education and communication
But all previouse experience show:
Once ragweed = always ragweed
![Page 34: $0#1#2$/3$ !#$%&’( !#$%#&’#$(#))$*+(, 4)#1/5$internationalragweedsociety.org/wp-content/uploads/2018/... · 2018-09-21 · Economic impact! Infestation of crop fields with ragweed](https://reader033.fdocuments.net/reader033/viewer/2022042116/5e9421bf01cd90491f691f7c/html5/thumbnails/34.jpg)
And there is still no end in sight....
Ambrosia psilostachya and the hybrid (A. artemisiifolia x psilostachya)
![Page 35: $0#1#2$/3$ !#$%&’( !#$%#&’#$(#))$*+(, 4)#1/5$internationalragweedsociety.org/wp-content/uploads/2018/... · 2018-09-21 · Economic impact! Infestation of crop fields with ragweed](https://reader033.fdocuments.net/reader033/viewer/2022042116/5e9421bf01cd90491f691f7c/html5/thumbnails/35.jpg)
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To prepare the old and young adults for the experiment, pupae are collected and isolated in a
petri dish. When the new adults emerged, they were sexed, and isolated in a 15ml Falcon®
tube (Figure 2) with a leaf of Ambrosia artemisiifolia for the supply and dated. In total 86 old
males and 110 young females have been isolated for the experiment (Figure 2).
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13 = {1 ,4} ! ! ! 34 = {2, 4,6} ! ! !
14 = {1 ,5} ! ! ! 35 = {3, 4,5} ! ! !
15 = {1 ,6} ! ! ! 36 = {3, 5,6} ! ! !
16 = {2 ,4} ! ! ! 33 = {4, 5,1} ! ! !
17 = {2 ,5} ! ! ! ! ! ! !
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