Efficacy of selected juvenoids on egg hatchability of the oriental fruit moth, Cydia molesta, and the grapevine moth, Lobesia botrana, in laboratory and field experiments
Kuldova, J.; Ricankova, M.; Hrdy, I.
Ochrana Rostlin 32(1): 19-25
The carbamate derivative of 2-(4-hydroxybenzyl)cyclohexanone (W-328) synthesized in the Institute of Organic Chemistry and Biochemistry, Prague, is similarly active as fenoxycarb or pyriproxyfen according to laboratory screening tests with freshly laid eggs of the oriental fruit moth, Cydia molesta, and the grapevine moth, Lobesia botrana. Concentrations that inhibited hatching in 50% of eggs (IC 50) in the range of 0.0202% (fenoxycarb) to 0.0654% (W-328) in C. molesta and in the range of 0.0158% (fenoxycarb) to 0.0744% (pyriprosy fen) in L. botrana were determined. Juvenoid W-328 was significantly more efficaceous than Insegar (a.i. fenoxycarb) in field trials with C. molesta on peach tree branches. Infestation by the oriental fruit moth larvae in the blank treatment was very high, reaching 56.2% to 97.5% in shoots and 31.5% to 79.1% in fruits. After W-328 treatment the infestation was 2.9% to 13.2% in shoots and 3.4% to 7.2% in fruits. Similarly, the damage by L. botrana was very high in the control, where up to 22.3% to 50% of berries were infested, but after W-328 treatment the infestation was only 0.9%. The compound W-328 appears promising for further development and application in Integrated Pest Management of orchard and vineyard pests.