The pea leafminer, Liriomyza huidobrensis (Blanchard) arrived in Israel a decade ago; its adults were resistant to conventional insecticides. Both adults and larvae cause damage by disrupting photosynthesis in all plants; additionally, there is damage to the cosmetic appearance in flowers and ornamentals. Field trials were conducted for two years on the effects of two translaminar insecticides (abamectin and cyromazine) for the control of the agromyzid leafminer, L. huidobrensis and their effect on the eulophid parasitoid, Diglyphus isaea, in potatoes (Solanum tuberosum) and celery (Apium graveolens). Abamectin and cyromazine were applied at recommended rates, only once and early in the growing season. Yellow sticky traps and leaf samples were used to monitor population levels. Gas chromatograph-mass spectrometer was used to monitor cyromazine residues within the plants for one season. Abamectin (plus 1% Ultrafine oil) significantly reduced larval leafminer levels for a shorter duration than cyromazine. Diglyphus isaea were less affected by abamectin treatments than by cyromazine. Cyromazine significantly reduced larval leafminer populations even after no residuals could be detected in plants. Implications of these results on management practices are discussed.
Species 1: Diptera Agromyzidae Liriomyza huidobrensis (pea leafminer)
Species 2: Hymenoptera Eulophidae Diglyphus isaea
Keywords: vegetables, residues
The ESA 2001 Annual Meeting - 2001: An Entomological Odyssey of ESA