oa Journal of the Entomological Society of Southern Africa - Biological and ecological studies of the parasitoid Chelonus inanitus (L) (Hymenoptera: Braconidae) in Israel II. Releases of adults in a cotton field



Repeated releases of adults of chelonus inanitus (L) in a cotton field were made during the summer of 1970 to study the ability of this parasitoid to hold the pest Spodoptera littoralis (Boisduval) below an economic threshold. The highest percentage parasitism recorded was 23,6%. In spite of parasitoid releases, the pest population reached above the economic threshold and the cotton field was sprayed with phosfolan; this treatment destroyed the parasitoid population and subsequently no parasitoids were recovered until late in the season, The 15 000 parasitoids which were released in the study area during four weeks did not produce reductions, in host population below the economic threshold.


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