Occurrence and parasitisation of the cereal leaf beetles (Oulema spp.) in central Hesse in 1986, and experiments for rearing of the egg parasite, Anaphes flavipes (Foerster)
1987
Lei Hua (Giessen Univ. (Germany, F.R.). Inst. fuer Phytopathologie und Angewandte Zoologie)
The cereal leaf beetles (Oulema spp.) were in Hesse in 1986. The mymarid wasp Anaphes flavipes parasitised 8 to 19 per cent of Oulema-eggs on cereals, 12 per cent on couch grass and zero on Bromus spp. Larval parasites (presumably 3 species) parasitised 60 per cent of O. lichenis cocoons. A. flavipes was reared in the laboratory in eggs of both Oulema spp. up to the fifth generation. One female produced a progeny of 22 at maximum, at the average 8.6. From one Oulema-egg 2.8 parasites emerged at the average, 10 to 13 days after oviposition by the parasites, at temperatures between 22 and 25 degrees C. The optimal number of parasites should be achieved with 20 to 30 Oulema-eggs exposed to 3 to 4 parasites (including 1 male). Unmated females have male progeny only. The possibilities of using A. flavipes for biological control of cereal leaf beetles in the field are discussed
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