Egg parasitization of Lymantria dispar (Lepidoptera, Lymantriidae)
1997
Zubrik, M. | Novotny, J. (Forest Research Inst., Banska Stiavnica (Slovak Republic). Research Station)
In 1991-1993 and 1995, the parasitization of gypsy moth (Lymantria dispar) eggs was investigated at 10 Slovak localities. Two species of egg parasitoids, Anastatus disparis (Hymenoptera, Eupelmidae) and Ooencyrtus kuvanae (Hymenoptera, Encyrtidae) were found. The total egg parasitization rate was 1.23 percent (0.00-10.08 percent). Overall, of 752 parasitized eggs 713 (94.8 percent) were parasitized by A. disparis and 39 (5.2 percent) by O. kuvanae. A. disparis occurred at 7 localities while O. kuvanae was rarer (it was found at 4 localities). The highest activity of both species was in low density host population. Gypsy moth population density (average number of egg masses per tree) was related to percentage of egg parasitism. A slight parasitization rate decrease with host population density increase was determined
显示更多 [+] 显示较少 [-]