Stimulation Effects of Low Gamma Radiation Doseson the Ectoparasitoid Habrobracon hebetor Say. (Hymenoptera: Braconidae)

N. BALEVSKI and N. GENCHEV
Plant Protection Institute, BG-2230 Kostinbrod, Bulgaria

Abstract

BALEVSKI, N. and N. GENCHEV, 2004. Stimulation effects of low gamma radiation doses on the ectoparasitoid Habrobracon hebetor Say. (Hymenoptera:Braconidae). Bulg. J. Agric. Sci., 10: 657-661

Stimulation effects of low gamma radiation doses on some biological parameters related to the propagation of the entomophagous ectoparasitoid Habrobracon hebetor Say. (Hymenoptera:Braconidae) have been studied. All irradiations were done with doses ranging from 5 Gy to 20 Gy. Treatment with dosage of 10 Gy resulted in considerable prolongation of both longevity and oviposition period of the female parasitoids accompanied with significant increase of their fecundity. Evidently, the extended time for oviposition enables the irradiated females to realize on a larger extent their egg production. The experimented gamma radiation doses did not affect the actual reproduction of H. hebetor and its sex ratio in the filial generation. Irradiations with doses of 15 Gy and 20 Gy led to reduction of male longevity.

Key words: Habrobracon, ectoparasitoid, entomophag, gamma radiation, stimulation effects