خصوصيات بيولوژيك زنبور پارازيتوييد تخم كرم ساقه خوار ذرت و نيشكر در استان خوزستان

Biological Characteristics of Platytelenomus hylas (Byrn.: Scelionidae) an Egg Parasitoid of Corn and Sugarcane Stalk borer Sesamia nonagrioides (Lep.: Noctuidae) in Khuzestan province

Egg parasitoid wasp, Plateytelenomus hylas Nixon is a natural control agent of Sesamia species that is made great hope to biological control of these harmful] pests. This parasitoid was reported from many countries in Southern Africa, Middle East, Asia and Southern Europe. The rate of parasitism by this parasitoid varies in different condition and up to 94/2% was reported. In this study morphological and biological characteristics of this wasp in laboratory and field condition were studied. On the basis of result between 2001 and 2002, this parasitoid was able to parasitize up to 90% of Sesamia eggs in corn fields. Sex ratio in natural condition was (1+ :l) while in lab. condition was (1.26:1). Parasitoid wasp can complete its life cycle in 11-14 days and it can produce several generations each year. The study on host acceptance range showed that only Sesamia eggs were paratisized by this parasitoid.