Abstract
One of the major challenges in managing the Colorado potato beetle, Leptinotarsa decemlineata (Say) is its remarkable ability to develop resistance to virtually every insecticide that has ever been used against it. Resistance is particularly common throughout northeastern USA as far north as Maine. The first instances of resistance to imidacloprid have already been reported from several locations in New York, Delaware and southern Maine. Rotating insecticides with different modes of action may delay insecticide resistance, but successful implementation of this technique depends on a good understanding of resistance and cross-resistance patterns in populations of target pests. LC(50) values were measured for imidacloprid and thiamethoxam in Colorado potato beetle populations from a variety of locations in the USA and Canada using diet incorporation bioassays. The field performance of imidacloprid, thiamethoxam and clothianidin against imidacloprid-resistant beetles on a commercial potato farm in southern Maine was also evaluated. Correlation between LC(50) values for imidacloprid and thiamethoxam was highly significant, even when populations previously exposed to thiamethoxam were excluded from the analysis. There was no statistically detectable difference in the LC(50) values between populations exposed to both insecticides and to imidacloprid alone. Applications of neonicotinoid insecticides at planting delayed build-up of imidacloprid-resistant beetle populations on field plots by 1-2 weeks but failed to provide adequate crop protection. Consistently with bioassay results, there was also substantial cross-resistance among the three tested neonicotinoid insecticides. Results of the present study support the recommendation to avoid rotating imidacloprid with thiamethoxam as a part of a resistance management plan.
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Claims 6
Claim · model-written summary
LC(50) values for imidacloprid and thiamethoxam were highly significantly correlated in Colorado potato beetle populations.
- Taxon
- potato
Solanum tuberosume4 - Interactor
- Colorado potato beetle
Leptinotarsa decemlineatae0pest - Compound
- imidaclopride1
- Outcome
- LC(50) valuese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One of the major challenges in managing the Colorado potato beetle, Leptinotarsa decemlineata (Say) is its remarkable ability to develop resistance to virtually every insecticide”
e1“Correlation between LC(50) values for imidacloprid and thiamethoxam was highly significant”
e4“on a commercial potato farm in southern Maine”
Claim · model-written summary
Populations exposed to both insecticides did not differ detectably in LC(50) values from populations exposed to imidacloprid alone.
- Taxon
- potatoSolanum tuberosume4
- Treatment
- exposed to both insecticidese3
- Interactor
- Colorado potato beetleLeptinotarsa decemlineatae0pest
- Outcome
- LC(50) valuese3
- Comparator
- imidacloprid alonee3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One of the major challenges in managing the Colorado potato beetle, Leptinotarsa decemlineata (Say) is its remarkable ability to develop resistance to virtually every insecticide”
e3“There was no statistically detectable difference in the LC(50) values between populations exposed to both insecticides and to imidacloprid alone”
e4“on a commercial potato farm in southern Maine”
Claim · model-written summary
Neonicotinoid applications at planting delayed build-up of imidacloprid-resistant beetle populations on field plots by 1-2 weeks.
- Taxon
- potatoSolanum tuberosume4
- Treatment
- Applications of neonicotinoid insecticides at plantinge2
- Interactor
- Colorado potato beetleLeptinotarsa decemlineatae0pest
- Outcome
- build-up of imidacloprid-resistant beetle populationse2
- Direction
- delayede2
- Value
- 1-2 weekse2
- Setting
- field plotse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One of the major challenges in managing the Colorado potato beetle, Leptinotarsa decemlineata (Say) is its remarkable ability to develop resistance to virtually every insecticide”
e2“Applications of neonicotinoid insecticides at planting delayed build-up of imidacloprid-resistant beetle populations on field plots by 1-2 weeks but failed to provide adequate crop protection”
e4“on a commercial potato farm in southern Maine”
Claim · model-written summary
Neonicotinoid applications at planting failed to provide adequate crop protection on potato.
- Taxon
- potatoSolanum tuberosume4
- Treatment
- Applications of neonicotinoid insecticides at plantinge2
- Outcome
- adequate crop protectione2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Applications of neonicotinoid insecticides at planting delayed build-up of imidacloprid-resistant beetle populations on field plots by 1-2 weeks but failed to provide adequate crop protection”
e4“on a commercial potato farm in southern Maine”
Claim · model-written summary
Substantial cross-resistance was found among the three tested neonicotinoid insecticides in Colorado potato beetle.
- Taxon
- potatoSolanum tuberosume4
- Interactor
- Colorado potato beetleLeptinotarsa decemlineatae0pest
- Outcome
- cross-resistancee5
- Qualifier
- substantiale5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One of the major challenges in managing the Colorado potato beetle, Leptinotarsa decemlineata (Say) is its remarkable ability to develop resistance to virtually every insecticide”
e5“there was also substantial cross-resistance among the three tested neonicotinoid insecticides”
e4“on a commercial potato farm in southern Maine”
Claim · model-written summary
The authors recommend avoiding rotation of imidacloprid with thiamethoxam as part of a resistance management plan for potato.
- Taxon
- potatoSolanum tuberosume4
- Outcome
- avoid rotating imidacloprid with thiamethoxame6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“on a commercial potato farm in southern Maine”
e6“Results of the present study support the recommendation to avoid rotating imidacloprid with thiamethoxam as a part of a resistance management plan”
The same questions in other papers
insecticide · control · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
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See all 10 papers →insecticide · Leptinotarsa decemlineata · Solanum tuberosum (potato)Positive and negative results
13 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
12 papers more in this group
See all 16 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.