Plum Curculio (Coleoptera: Curculionidae) Adult Mortality and Associated Fruit Injury After Exposure to Field-Aged Insecticides on Tart Cherry Branches

Abstract

Plum curculio, Conotrachelus nenuphar (Herbst) (Coleoptera: Curculionidae), adults were exposed to field-aged residues of thiamethoxam, acetamiprid, thiacloprid, indoxacarb, or azinphos-methyl on tart cherry, Prunus cerasus L. variety Montmorency. At 1, 3, 7, and 14 d postapplication, fruit were sampled for chemical residues, and bioassays were used to assess beetle mortality and plant tissue injury. Azinphos-methyl had lethal activity within 1 d of exposure at all postapplication intervals and significant fruit protection extended to 14 d postapplication. All of the neonicotinoids had lethal activity at 3 d posttreatment, with acetamiprid activity extending to 7 d. Antifeedant and oviposition deterrent effects were seen with thiamethoxam and thiacloprid; damage incidence was significantly reduced in the absence of significant beetle mortality or intoxication. Thiamethoxam and acetamiprid penetrated into leaf and fruit tissue and were detected in the interior tissues at 14 d postapplication, but interior thiacloprid residues were not detected after day 1. Indoxacarb provided some fruit protection out to 7 d postapplication, and 14-d-old residues intoxicated beetles, but the slow action of this compound allowed significant damage to occur before beetles were incapacitated. Indoxacarb was only detected as a surface residue after the first day postapplication. These data on the plant-insect-chemistry interactions will support use and management decisions as compounds with acute contact activity are phased out.

Lethality of reduced-risk insecticides against plum curculio (Coleoptera: Curculionidae) in blueberries, with emphasis on their curative activity

“…In blueberries, the neonicotinoid acetamiprid had weak adulticidal activity on C. nenuphar in the field. These results differ from a previous study showing lethal activity of acetamiprid on C. nenuphar adults in tart cherry, indicating possible crop‐specific adult toxicity of neonicotinoids on this weevil pest. The neonicotinoids acetamiprid and thiamethoxam, however, had the best curative control of all reduced‐risk and OP‐replacement insecticides tested against C. nenuphar (Fig.…”

Laboratory and field comparisons of insecticides to reduce infestation of Drosophila suzukii in berry crops

“…antifeeding, repellency, ovipositional deterrence) 13, 14. Furthermore, their systemic properties have led to interest in their curative potential, recently extensively investigated in apple and blueberry14–16 and cherry 17. While the sublethal effects of these products were not studied, altered behavior (slower movement and accelerated oviposition) of D. suzukii adults exposed to neonicotinoid treated fruit was observed.…”

Rainfastness and Residual Activity of Insecticides to Control Japanese Beetle (Coleoptera: Scarabaeidae) in Grapes

“…Nontransformed means are shown. The contact toxicity of thiamethoxam on beetles is known to be short lived, but as residues move into plant tissue antifeedant effects become more prominent (Hoffmann et al 2010). The antifeedant effects of thiamethoxam on Japanese beetle protect grape leaves from defoliation (Fig.…”