[Parasitization of black bean aphid population aphis fabae scop. (Aphididae:Homoptera) on their winter host plan]
1995
Chikh-Khamis, Z. (j"a:mi3at al-ba3t", Homs (Syria). Kulliyyat al-zira:3at)
Studies were carried out in Poland, Wroclaw in 1989-1991, on spindle tree Evonymus europaea L. as a winter host plant. The aim of present paper was to determine the degree of parasitization on aphid colonies, and to define the species composition of parasitodis and hyperparasitodis. During three years of this study, the maximum of parasitization were made up 25.4,44.3 and 30.1, respectively. They synchronized with appearance of winged form of aphid and the beginning of migration from winter host. A total of 1735 parasitic wqasps were collected. They were identified to 13 species, including parasitoids and hyperparasitoids, belonging to Hymenoptera. The parasitoid Trioxys angelicae Hal. (Aphidiidae) was the most abundant species. However the species Asaphes vulgaris Wlk. (Pteromalidae) was the most abundant hyperparasitoid.
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