Field evaluation of cartap, cyromazine, permethrin and phenthoate for control of the stone leek leafminer Liriomyza chinensis (Diptera: Agromyzidae)

The stone leek leafminer, Liriomyza chinensis (Kato), has become a serious pest on onioncrops in the whole Vietnam, and it is treated by a wide range of conventional insecticides. Growers apply insecticides early after a few mines on several leaves have been seen, and repeated applications are usually made. Field trial was conducted to evaluate the effects of a single application of four currently and potentially used insecticides on L. chinensis. These insecticides were applied at recommended field rates. Leaf samples were used to monitor larval population, and yellow sticky traps were used to monitor adult population. Cyromazine was effective on the larvae, but no effective on the adults. Cartap, permethrin and phenthoate were not or less effective on neither larvae nor adults of the leafminer. These results suggest that cyromazine application provide one potential component of an effective L. chinensis control strategy for Vietnamese onion farmers.