Synergism between local‐ and landscape‐level pesticides reduces wild bee floral visitation in pollinator‐dependent crops

Bloom, Elias H.; Wood, Thomas J.; Hung, Keng‐Lou James; Ternest, John J; Ingwell, Laura L.; Goodell, Karen; Kaplan, Ian; Szendrei, Zsofia

doi:10.1111/1365-2664.13871

Cited by 39 publications

(28 citation statements)

References 43 publications

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“…The specific concentrations reported for imidacloprid in croptreated pollen were high (median in watermelon: 75.4 ng g −1 ) but within the range detected in other studies of neonicotinoids in cucurbits [45][46][47]. For example, Bloom et al [45] reported the median thiamethoxam concentration in seed-treated cucumber pollen from commercial fields at 73.7 ng g −1 . Similarly, Dively & Kamel [46] found the mean imidacloprid residues in pumpkin pollen at 60.9 ng g −1 , using the same soil drench technique and product used here.…”

Section: Discussionsupporting

confidence: 75%

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Supplemental forage ameliorates the negative impact of insecticides on bumblebees in a pollinator-dependent crop

et al. 2021

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Insecticide use and insufficient forage are two of the leading stressors to pollinators in agroecosystems. While these factors have been well studied individually, the experimental designs do not reflect real-world conditions where insecticide exposure and lack of forage occur simultaneously and could interactively suppress pollinator health. Using outdoor enclosures, we tested the effects of insecticides (imidacloprid + lambda-cyhalothrin) and non-crop forage (clover) in a factorial design, measuring the survival, behaviour and performance of bumblebees ( Bombus impatiens ), as well as pollination of the focal crop, watermelon. Colony survival was synergistically reduced to 17% in watermelon alone + insecticides (survival was 100% in all other treatments). However, behavioural shifts in foraging were mainly owing to insecticides (e.g. 95% reduced visitation rate to watermelon flowers), while impacts on hive performance were primarily driven by clover presence (e.g. 374% increase in the number of live eggs). Insecticide-mediated reductions in foraging decreased crop pollination (fruit set) by 32%. Altogether, these data indicate that both insecticides and non-crop forage play integral roles in shaping pollinator health in agricultural landscapes, but the relative importance and interaction of these two factors depend on which aspect of ‘health’ is being considered.

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Section: Discussionsupporting

confidence: 75%

“…For example, Bloom et al . [ 45 ] reported the median thiamethoxam concentration in seed-treated cucumber pollen from commercial fields at 73.7 ng g −1 . Similarly, Dively & Kamel [ 46 ] found the mean imidacloprid residues in pumpkin pollen at 60.9 ng g −1 , using the same soil drench technique and product used here.…”

Section: Discussionmentioning

confidence: 99%

Supplemental forage ameliorates the negative impact of insecticides on bumblebees in a pollinator-dependent crop

et al. 2021

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“…However, this differential response among pollinators is likely driven in part by other factors inherent to honey bee biology and management (e.g., hives are stocked at high densities, with >20,000 individuals per colony; large individual body size, and thus pesticide tolerance, compared to many solitary wild species). A recent field experiment on commercial cucurbit farms in the midwestern United States similarly found that insecticide use reduces wild bee visitation with no corresponding effect on honey bees ( 78 ). This effect is notable, since wild bees in our experiment were both most sensitive to insecticide use and most strongly correlated with crop yield.…”

Section: Discussionmentioning

confidence: 99%

IPM reduces insecticide applications by 95% while maintaining or enhancing crop yields through wild pollinator conservation

Pecenka

Ingwell

Foster

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Pest management practices in modern industrial agriculture have increasingly relied on insurance-based insecticides such as seed treatments that are poorly correlated with pest density or crop damage. This approach, combined with high invertebrate toxicity for newer products like neonicotinoids, makes it challenging to conserve beneficial insects and the services that they provide. We used a 4-y experiment using commercial-scale fields replicated across multiple sites in the midwestern United States to evaluate the consequences of adopting integrated pest management (IPM) using pest thresholds compared with standard conventional management (CM). To do so, we employed a systems approach that integrated coproduction of a regionally dominant row crop (corn) with a pollinator-dependent specialty crop (watermelon). Pest populations, pollination rates, crop yields, and system profitability were measured. Despite higher pest densities and/or damage in both crops, IPM-managed pests rarely reached economic thresholds, resulting in 95% lower insecticide use (97 versus 4 treatments in CM and IPM, respectively, across all sites, crops, and years). In IPM corn, the absence of a neonicotinoid seed treatment had no impact on yields, whereas IPM watermelon experienced a 129% increase in flower visitation rate by pollinators, resulting in 26% higher yields. The pollinator-enhancement effect under IPM management was mediated entirely by wild bees; foraging by managed honey bees was unaffected by treatments and, overall, did not correlate with crop yield. This proof-of-concept experiment mimicking on-farm practices illustrates that cropping systems in major agricultural commodities can be redesigned via IPM to exploit ecosystem services without compromising, and in some cases increasing, yields.

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“…The information-theoretic approach based on the corrected Akaike's information criterion (AICc) was applied to remove non-signi cant terms (Grueber et al, 2011). We used the "dredge" and "get.models" functions in the R package MuMIn (Bartoń, 2019) to generate all possible models and selected the top ranked models with a ΔAICc value (i.e., AICc -AICc min ) < 2 (Bloom et al, 2021). The variance expansion factor (VIF) of models was calculated to evaluate the collinearity between explanatory variables.…”

Section: Discussionmentioning

confidence: 99%

Effects of Forest Structure On Dendroctonus Valens Damage Under Natural and Human Disturbances

Zhan

Wang

et al. 2021

Preprint

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Background In recent years, the red turpentine beetle (Dendroctonus valens, RTB), an invasive pest species has spread northward along the distribution of pine forests, forming a potential threat to healthy pine forests in North China. Previous studies have shown that natural (e.g., fire) and human (e.g., felling) disturbances can significantly promote bark beetle damage. However, few studies have considered the effect of forest landscape structure on bark beetle damage under disturbance conditions. Here we used generalized linear models and generalized linear mixed models to explore the effects of multi-scale factors on RTB damage under different disturbance conditions (presence or absence) in 109 forest stands in the Heilihe National Nature Reserve, Inner Mongolia. Result Disturbance (i.e., fire and stolen felling) could significantly promote the occurrence of RTB. In the absence of disturbance, small-scale stand factors (i.e., aspect and canopy density) played important roles in the prediction of RTB damage. In the presence of disturbance, forest landscape structure (i.e., forest isolation) was the main factor affecting RTB invasion. Conclusion In the presence of disturbance, the forest structure played an important role in the process of the diffusion of RTB from the surrounding habitat to the disturbance. This study, which emphasizes the potential importance of forest landscape structure on RTB spread, not only provides new insights into understanding the roles of large-scale factors but also assists in the implementation of pest management programs.

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Synergism between local‐ and landscape‐level pesticides reduces wild bee floral visitation in pollinator‐dependent crops

Cited by 39 publications

References 43 publications

Supplemental forage ameliorates the negative impact of insecticides on bumblebees in a pollinator-dependent crop

Supplemental forage ameliorates the negative impact of insecticides on bumblebees in a pollinator-dependent crop

IPM reduces insecticide applications by 95% while maintaining or enhancing crop yields through wild pollinator conservation

Effects of Forest Structure On Dendroctonus Valens Damage Under Natural and Human Disturbances

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