Abstract
During 1991 and 1992, investigations were conducted in two vineyards of southwestern Germany to determine the predation pressure of selected arthropod species on Eupoecilia ambiguella (Hbn.) (Lepidoptera: Cochylidae), a serious pest of grapevine. Predation was detected by an antiserum, which was used in the Enzyme-Linked Immunosorbent Assay (ELISA). The test was carried out with four predatory species, which are common on the flower and fruit of the investigated grapevines. The percentage of positive reactions when testing 698 animais was 4.4% for Orius minutus (Heteroptera: Anthocoridae), 10.3% for larvae of Chrysoperla carnea (Planipennia: Chrysopidae), 15.1% for Aptus mirmicoides (Heteroptera: Nabidae) and 5.8% for Forficula auricularia (Dermaptera: Forficulidae). Because of the extreme polyphagy of the species under study and the fact, that the assays were not very sensitive, the immunological results alone are insufficient for the evaluation of the importance of the predators asantagonists of Eupoecilia ambiguella.
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