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Evaluation of Transplant Drench and Foliar Insecticide Applications for Wireworm (Coleoptera: Elateridae) Management in Sweetpotato
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Evaluation of Transplant Drench and Foliar Insecticide Applications for Wireworm (Coleoptera: Elateridae) Management in Sweetpotato
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Evaluation of Transplant Drench and Foliar Insecticide Applications for Wireworm (Coleoptera: Elateridae) Management in Sweetpotato
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Journal Article
Evaluation of Transplant Drench and Foliar Insecticide Applications for Wireworm (Coleoptera: Elateridae) Management in Sweetpotato
2024
Overview
The revocation of chlorpyrifos tolerances in 2022 left sweetpotato growers without their most important tool to combat a complex of soil-borne root pests that includes wireworms (Coleoptera: Elateridae). Since then, growers have reported increased root damage despite a rapid pivot to pyrethroid-based management systems to replace mechanically incorporated preplant chlorpyrifos broadcast sprays. Our goal was to evaluate the efficacy of alternative insecticide chemistries and application methods to expand the portfolio of management options for wireworms, specifically Conoderus spp. and Melanotus communis (Gyllenhal). We tested (i) insecticidal transplant water drenches and (ii) a foliar spray program targeting adult elaterids. We found that incorporating insecticides into transplant water reduced wireworm damage when compared to untreated transplant water. Our treatments included a recently registered meta-diamide, broflanilide, which represents a promising path to diversify active ingredients and shift away from an overreliance on preplant and post-directed pyrethroid soil sprays. Foliar spray plots had less damage than plots that did not receive foliar sprays. One benefit of adult-focused management is the availability of effective monitoring tools such as sex pheromones and blacklight trapping. Developing a robust adult monitoring program would enable more precise applications of foliar insecticides versus season-long prophylactic soil sprays targeting larvae. Our results demonstrated a significant benefit to both alternative delivery methods.These management alternatives could expand treatment options beyond traditional preplant and post-directed pyrethroid sprays.
Publisher
Entomological Society of America,Oxford University Press
