Insecticide susceptibility of Liriomyza sativae, L. trifolii, and L. bryoniae (Diptera: Agromyzidae)

Abstract

The insecticide susceptibility of the vegetable leafminer, Liriomyza sativae Blanchard, the serpentine leafminer, L. trifolii (Burgess), and the tomato leafminer, L. bryoniae (Kaltenbach), on kidney bean leaves were evaluated at 25°C under a 15L-9D photoperiod. Susceptibility to the tested insecticides varied among the developmental stages, species, and populations of the leafminer. Among the 25 insecticides tested on second instar larvae using an insecticide spraying tower, chlorpyrifos, isoxathion, cartap, thiocyclam, cyromazine, emamectin benzoate, pyridalyl, and spinosad were more toxic on the three Liriomyza species. Among the 20 insecticides tested on adult leafminers using the leaf dipping method, cartap and thiocyclam produced high mortality in the three Liriomyza species. The application of cartap, thiocyclam, emamectin benzoate, and spinosad reduced the number of feeding and oviposition punctures made by female adults of the three Liriomyza species on the leaves. None of the insecticides examined significantly affected the egg mortality of any of the three Liriomyza species.