Demographic study of sunn pest egg parasitoids in Qazvin province

Species composition of sunn pest egg parasitoids is related to region and canvas, but in a specified range of the time and place, one or a few species are more abundant. In order to evaluate and compare the life table parameters of sunn pest egg parasitoids, parasitized eggs were collected during sunn pest oviposition period in Qazvin province cereal fields and transferred to the laboratory of sunn pest research department. Then, the emerged wasps were reared on the sunn pests or Graphosoma eggs separately. Afterwards, the biological characteristics of each species including immature developmental period, adult's survivorship, fecundity, and longevity were measured. The faunistic studies results showed that there were two species of parasitoids including Trissolcus grandis and T. semisttriatus on sunn pest eggs in Qazvin province. Data analysis showed that immature developmental period of T. grandis was significantly lower than that of T. semistriatus. Moreover, the comparative studies of population growth parameters of T. grandis and T. semistriatus showed that net and gross reproductive rates of T. grandis were higher than those of T. semistriatus and totally, T. grandis had higher reproductive potential.