Pilot-Versuch zur Bekämpfung von Stechmückenlarven im Freiland mit einem UV-behandelten Präparat von Bacillus thuringiensis var. israelensis |
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| Authors: | Dipl-Biol S Engler J Morawcsik W Schnetter A Krieg |
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| Institution: | 1. Zoologisches Institut I und II der Universit?t Heidelberg, Im Neuenheimer Feld 230, D-6900, Heidelberg 1
2. Biologische Bundesanstalt für Land- und Forstwirtschaft, Institut für biologische Sch?dlingsbek?mpfung, Darmstadt
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| Abstract: | Preparations derived from sporulated cultures ofBacillus thuringiensis var.israelensis were used in a small field trial for control of mosquito larvae (Aedes cantans, Aedes rusticus, Culiseta morsitans). In the test two liquid formulations (suspension) were compared: (1) a native preparation containing living spores and toxic crystals, and (2) a preparation in which the spores have been inactivated to a high degree (99.99%) by ultraviolet rays. The efficacy of both preparations against mosquito larvae showed no difference: doses of 104 to 105 spore equvalents/ml, induced 100% mortality of the target insects. But no harmful effect on non-target organisms (especially water arthropods with exception of Chironomidae larvae) could be observed. To minimize the contamination of surface water with living spores, the use of UV-inactivated preparations ofB. t. var.israelensis is indicated for mosquito control. |
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