Abstract

The influence of the size of host patch (Eurygaster integriceps Put. egg mass size), mating and parasitism period on the sex ratio and parasitism rate of Trissolcus semistriatus Nees was investigated under laboratory conditions. The results showed that the parasitism rate and sex ratio did not significantly change depending on egg mass size and parasitism period. However, these rates decreased with increasing mating period. The lowest values for parasitism rate and sex ratio, were recorded as 54.50 % and 0.48, respectively, at a mating period of 3 days. In conclusion, it was suggested that an egg mass of 12-24 eggs was exposed to one female during 24 hours for parasitism after 1 day of mating period for mass production of T. semistriatus.