Abstract
BACKGROUND: Although the abundance of insect natural enemies in crop fields may be influenced by the surrounding landscape and local field management, particularly insecticide use at the local scale, few studies have examined these factors simultaneously. In this study, we investigated the effects of landscape context and insecticide use in local fields on ladybeetle abundance in wheat fields in northern China. RESULTS: Woodlots and fallow land were the most important landscape variables enhancing ladybeetle abundance. We used the cumulative percentage of these land types to characterize landscape complexity. Comparing the change in ladybeetle abundance in wheat fields within different landscapes and with different in-field insecticide regimes, we found that although more complex landscapes enhanced ladybeetle abundance, the negative effects of insecticide use on ladybeetle populations were not offset by landscape complexity. Additionally, the positive effects of more complex landscapes on ladybeetle abundance were not significant in wheat fields subjected to high insecticide use. CONCLUSION: Ladybeetle abundance is enhanced by landscape complexity, but this is modified by insecticide use in local fields. Within-field efforts to maximize the conservation biological control of pests to improve crop yield should take into account the influence of the surrounding landscape. © 2018 Society of Chemical Industry.
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Claims 5
Claim · model-written summary
Woodlots enhanced ladybeetle abundance.
- Taxon
- wheat
Triticum aestivumt0 - Interactor
- ladybeetlee0biocontrol_agent
- Outcome
- ladybeetle abundancee0
- Direction
- enhancinge0
- Setting
- Woodlotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat fields”
e0“Woodlots and fallow land were the most important landscape variables enhancing ladybeetle abundance”
Claim · model-written summary
Fallow land enhanced ladybeetle abundance.
- Taxon
- wheatTriticum aestivumt0
- Interactor
- ladybeetlee0biocontrol_agent
- Outcome
- ladybeetle abundancee0
- Direction
- enhancinge0
- Setting
- fallow lande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat fields”
e0“Woodlots and fallow land were the most important landscape variables enhancing ladybeetle abundance”
Claim · model-written summary
Insecticide use reduced ladybeetle populations despite landscape complexity.
- Taxon
- wheatTriticum aestivume0
- Treatment
- insecticide usee1
- Interactor
- ladybeetlee1biocontrol_agent
- Outcome
- ladybeetle populationse1
- Direction
- negative effectse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ladybeetle abundance in wheat fields within different landscapes”
e1“the negative effects of insecticide use on ladybeetle populations were not offset by landscape complexity”
Claim · model-written summary
The positive landscape association was nonsignificant under high insecticide use.
- Taxon
- wheatTriticum aestivume0
- Treatment
- high insecticide usee0
- Interactor
- ladybeetlee1biocontrol_agent
- Outcome
- ladybeetle abundancee1
- Direction
- positive effectse1
- Setting
- more complex landscapese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat fields subjected to high insecticide use”
e1“the positive effects of more complex landscapes on ladybeetle abundance were not significant”
Claim · model-written summary
Conservation biocontrol efforts should account for the surrounding landscape.
- Taxon
- wheatTriticum aestivume0
- Outcome
- take into account the influence of the surrounding landscapee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insecticide use in local fields on ladybeetle abundance in wheat fields”
e1“Within-field efforts to maximize the conservation biological control of pests to improve crop yield should take into account the influence of the surrounding landscape”
The same questions in other papers
insecticide · pest · Triticum aestivum (wheat)Positive and negative results
7 papers in the same direction as this paper · 30 in the opposite direction
- positive
- positive
- positive
34 papers more in this group
See all 38 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.