none Factors affecting envenomation by the braconid, B. brevicornis Wesmael were investigated. Envenomation capacity of the females increased with age, especially after 3 h of exposure to host larvae. Starvation of the parasitoid female did not decline its capacity of stinging and immobilization of host larvae. At 10 degree C, females seem to be unable to sting and paralyze Sesamia (S. cretica) larvae even after 12 h. The numbers of host larvae which a female paralyzes differ at different temperatures and with different hosts. The relationship between envenomation and temperature was positive.