Electrophysiological and Behavioral Responses of to Volatiles from Peanut.

(Coleoptera: Scarabaeidae: Melolonthinae) is a notorious pest of many crops, especially peanuts. In this study, volatiles from peanut plants were analyzed using both gas chromatographic-electroantennographic detection (GC-EAD) and gas chromatography/mass spectrometry (GC/MS) techniques, and tested for adult attraction with field trapping bioassays in Hebei Province, China. GC-EAD analyses indicated that antennae strongly responded to twelve GC peaks, including eight identified compounds, ()--ocimene, hexanal, 6-methyl-5-hepten-2-one, nonanal, dihydromyrcenol, linalool, -caryophyllene, methyl salicylate, and four unidentified compounds. When tested individually in field conditions from 24 to 31 July, 2020, -caryophyllene and hexanal significantly attracted both sexes of , whereas all other compounds were unattractive. A blend of -caryophyllene and hexanal at a ratio of 2:1, close to the natural ratio of these two compounds from the intact peanut plant, was most attractive to the beetles. The remaining identified compounds, ()--ocimene, 6-methyl-5-hepten-2-one, nonanal, dihydromyrcenol, linalool, and methyl salicylate had no synergistic effects on attraction when tested in combination with the blend of -caryophyllene and hexanal. These results demonstrated that -caryophyllene and hexanal in the volatiles from peanut plants have strong attraction to . These two compounds have the potential to be used for monitoring and its management programs.