Biological control of Liriomyza sativae on greenhouse tomatoes.
Liriomyza sativae Blanch. is an important pest of greenhouse tomatoes in northern USA and Canada. Studies on its biology showed that the sum of effective temperatures for development from egg to adult was about 220.8 day-degrees C above a threshold of 12.3 deg C. Several species of parasites were reared at 22-24 deg C and the average duration of development from the time of the exposure of suitable hosts to the emergence of the adult parasite was found to be 14.25 days for Diglyphus begini (Ashm.); 16.06 for Pnigalio flavipes (Ashm.); 20.37 for Opius dimidiatus (Ashm.); 22.43 for Chrysocharis viridis Prov.; and 24.64 for Halticoptera patellana (Dalm.). Further studies are in progress to evaluate the usefulness of these parasites for control.