واكنش تابعي زنبور پارازيتوييد روي دو نوع ميزبان آزمايشگاهي

Functional Response of Trichogramma embryophagum (Hym.: Trichogrammatidae)on Two Laboratory Hosts

In order to determine the effect of the type of host species on searching efficiency, handling time and functional response of Trichogramma embryophagum, it was reared on Ephestia kuehniella and Sitotroga cerealella eggs for 15 generations. Different levels of hosts egg densities as: 2. 4, 6, 8, 14, 20, 30, 40 and 50 were used. Each density was placed in a test tube (16 x 100 mm) and then exposed to a 24 h mated female. The experiments were carried out at 25+1 °C, 50+5% RH and 16:8 (L:D) photoperiod. In both experiments functional response was a type III and Rolling disc equation was used to estimate the parameters. Searching efficiency, handling time and estimated maximum percent of parasitism for parasitoids reared on S. cerealella were 0.13, 1.64 and 75.73, and for those reared on E. kuehniella were 0.1 I, 1.65 and 68.78, respectively. There was no significant difference between estimated parameters in both experiments. The results revealed that the type of laboratory host has no important effect on functional response of T. embryophagum.