Abstract
Concern over insecticide resistance has led to the suggestion of spatially variable within-field management of Colorado potato beetle, Leptinotarsa decemlineata (Say). Here we compare L. decemlineata spatial and temporal dynamics, and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields and to fields where all rows received the systemic. The systemic targeted immigrating individuals which, having acquired the field through either flight or walking, first established themselves in the outer 5.5 m of the field. The perimeter treatment (≈25% of field area) reduced mean densities with no effect on timing of peak densities. Immigrating adults established similar spatial trends in both perimeter and untreated fields. Although trends in F1 larval densities have been shown to follow the patterns established by immigrating adults, trends in the F1 larval densities of the perimeter treatments diverged from adult patterns and developed highest densities in field centers. Immigrating adults had little to no spatial dependence in the covariance structure in any treatments. Spatial dependence in the covariance structure of F1 larval and F1 adult populations developed as density increased in both perimeter and untreated fields, with a tendency for increasing spatial dependence in perimeter fields, though this was not statistically significant. Comparing the perimeter to untreated fields, yields increased at a proportion that was higher than the proportion of land area treated, but remained significantly lower than the whole-field treatment. These results suggest that the perimeter tactic has promise as a site-specific resistance management program, but that refinement of border width is needed to optimize trade-offs among yield, quality, and long-term maintenance of susceptibility.
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Claims 11
Claim · model-written summary
The perimeter treatment reduced mean Colorado potato beetle densities relative to untreated fields.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- narrow perimeter (5.5 m) of systemic imidaclopride0
- Interactor
- Colorado potato beetle
Leptinotarsa decemlineatae1pest - Outcome
- mean densitiese2
- Direction
- reducede2
- Comparator
- untreated fieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e1“Concern over insecticide resistance has led to the suggestion of spatially variable within-field management of Colorado potato beetle, Leptinotarsa decemlineata (Say)”
e2“The perimeter treatment (≈25% of field area) reduced mean densities with no effect on timing of peak densities”
Claim · model-written summary
The perimeter treatment had no effect on the timing of peak Colorado potato beetle densities.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- perimeter treatmente2
- Interactor
- Colorado potato beetleLeptinotarsa decemlineatae1pest
- Outcome
- timing of peak densitiese2
- Direction
- no effecte2
- Comparator
- untreated fieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e1“Concern over insecticide resistance has led to the suggestion of spatially variable within-field management of Colorado potato beetle, Leptinotarsa decemlineata (Say)”
e2“The perimeter treatment (≈25% of field area) reduced mean densities with no effect on timing of peak densities”
Claim · model-written summary
Immigrating Colorado potato beetle adults showed similar spatial trends in perimeter and untreated fields.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- Immigrating adultse3
- Interactor
- Colorado potato beetleLeptinotarsa decemlineatae1pest
- Outcome
- spatial trendse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e1“Concern over insecticide resistance has led to the suggestion of spatially variable within-field management of Colorado potato beetle, Leptinotarsa decemlineata (Say)”
e3“Immigrating adults established similar spatial trends in both perimeter and untreated fields”
Claim · model-written summary
F1 larval beetle densities in perimeter treatments diverged from adult patterns and were highest in field centers.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- F1 larvale4
- Treatment
- perimeter treatmentse4
- Interactor
- Colorado potato beetleLeptinotarsa decemlineatae1pest
- Outcome
- F1 larval densitiese4
- Direction
- divergede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e1“Concern over insecticide resistance has led to the suggestion of spatially variable within-field management of Colorado potato beetle, Leptinotarsa decemlineata (Say)”
e4“trends in the F1 larval densities of the perimeter treatments diverged from adult patterns and developed highest densities in field centers”
Claim · model-written summary
Immigrating Colorado potato beetle adults had little to no spatial dependence in the covariance structure in any treatment.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- Immigrating adultse5
- Interactor
- Colorado potato beetleLeptinotarsa decemlineatae1pest
- Outcome
- spatial dependence in the covariance structuree5
- Direction
- little to noe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e1“Concern over insecticide resistance has led to the suggestion of spatially variable within-field management of Colorado potato beetle, Leptinotarsa decemlineata (Say)”
e5“Immigrating adults had little to no spatial dependence in the covariance structure in any treatments”
Claim · model-written summary
Spatial dependence in F1 larval and F1 adult beetle populations developed as density increased in both perimeter and untreated fields.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- F1 larval and F1 adult populationse6
- Interactor
- Colorado potato beetleLeptinotarsa decemlineatae1pest
- Outcome
- spatial dependence in the covariance structuree6
- Direction
- increasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e1“Concern over insecticide resistance has led to the suggestion of spatially variable within-field management of Colorado potato beetle, Leptinotarsa decemlineata (Say)”
e6“Spatial dependence in the covariance structure of F1 larval and F1 adult populations developed as density increased in both perimeter and untreated fields”
Claim · model-written summary
A tendency for increasing spatial dependence in perimeter fields was not statistically significant.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- perimeter fieldse7
- Outcome
- spatial dependencee7
- Direction
- increasinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e7“with a tendency for increasing spatial dependence in perimeter fields, though this was not statistically significant”
Claim · model-written summary
Yields in perimeter fields increased by a proportion higher than the proportion of land area treated, compared with untreated fields.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- perimetere2
- Outcome
- yieldse2
- Direction
- increasede2
- Qualifier
- at a proportion that was higher than the proportion of land area treatede2
- Comparator
- untreated fieldse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e2“Comparing the perimeter to untreated fields, yields increased at a proportion that was higher than the proportion of land area treated”
Claim · model-written summary
Yields with the perimeter treatment remained significantly lower than with whole-field treatment.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- perimetere2
- Outcome
- yieldse2
- Direction
- lowere3
- Comparator
- whole-field treatmente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e2“Comparing the perimeter to untreated fields, yields increased at a proportion that was higher than the proportion of land area treated”
e3“but remained significantly lower than the whole-field treatment”
Claim · model-written summary
The perimeter tactic has promise as a site-specific resistance management program in potato.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- site-specific resistance management programe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e4“These results suggest that the perimeter tactic has promise as a site-specific resistance management program”
Claim · model-written summary
Border width of the perimeter treatment needs refinement to optimize trade-offs among yield, quality and susceptibility maintenance.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- refinement of border widthe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and potato yield, in fields treated with a narrow perimeter (5.5 m) of systemic imidacloprid supplemented with spatially targeted sprays to untreated fields”
e5“refinement of border width is needed to optimize trade-offs among yield, quality, and long-term maintenance of susceptibility”
The same questions in other papers
imidacloprid · Leptinotarsa decemlineata · Solanum tuberosum (potato)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.