Incidence of parasitoids on the leaf-miner species, Liriomyza trifolii (Burgess) (Diptera: Agromyzidae), in tomato fields, at Qaluobia Governorate, Egypt.
Field studies were carried out to determine the population density of the leaf-miner, Liriomyza trifolii (Burgess) attacking early summer plantations of tomato fields and percentages of parasitism on it. The incidence of naturally major parasitoid species of the pest recorded during the two successive seasons, 2008 and 2009, at Qaluobia Governorate, Egypt, were also investigated. Obtained data revealed that, the common surveyed parasitoid species of L. trifolii were; Chrysocharis sp., Cirrospilus sp., Diglyphus crassinveris, D. isaea and Neochrysocharis sp. The surveyed parasitoid species played an important natural role in suppressing the pest population density. The total parasitism rate increased when all parasitoid species occurred together at the same time, compared to the existence of each parasitoid separately. The two common recorded parasitoid species; D. isaea and Neochrysocharis sp., are candidates to be mass reared for controlling L. trifolii in tomato fields and/or greenhouses.