Laboratory Assays Against Adult and Larval Sap Beetles (Coleoptera: Nitidulidae) Using Entomopathogenic Nematodes, Microbial-Based Insecticides, and Synthetic Insecticides
2019
Cottrell, Ted E. | Shapiro-Ilan, David I. | Horton, Dan L.
Sap beetles, Carpophilus spp. (Coleoptera: Nitidulidae), damage peach fruit leading to the need for efficacious control measures. We assayed different species and strains of entomopathogenic nematodes (Heterorhabditis bacteriophora Vs strain, H. indica HOM1 strain, H. megidis UK211 strain, Steinernema carpocapsae All strain, S. feltiae Sn strain, and S. riobrave 355 strain) against larval Carpophilus spp. and insecticides (microbialbased Grandevo® and Venerate™ bioinsecticides, along with the synthetic thiamethoxam, acetamiprid, indoxacarb, β-cyfluthrin, clothianidin, carbaryl, chlorantraniliprole, fenpropathrin, spinetoram, phosmet, malathion, and imidacloprid) against adult Carpophilus spp. in the laboratory. All entomopathogenic nematodes assayed caused significantly higher larval mortality than the control. How the insecticides were presented to the adult beetles affected whether beetles were rated as nonfeeding (dead+moribund). Fewer insecticides were active against the adults when applied to filter paper than when applied to a plug of pear that beetles fed upon. Overall, indoxacarb and phosmet provided consistently better control, regardless of the exposure method. These two insecticides, with different modes of action, also have a 14-d preharvest interval when used on peach, making it imperative to detect these pests well before harvest. Chlorantraniliprole and the microbial-based products had no effect on adult beetles regardless of the exposure method.
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