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Zur Wirkung von Bacillus thuringiensis (Berliner) auf den Kiefernspanner Bupalus piniarius (L.) (Lep., Geometrid.)
Author(s) -
Skatulla U.
Publication year - 1971
Publication title -
zeitschrift für angewandte entomologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0044-2240
DOI - 10.1111/j.1439-0418.1971.tb03177.x
Subject(s) - bacillus thuringiensis , larva , pupa , biology , zoology , population , body weight , horticulture , toxicology , botany , bacteria , medicine , genetics , environmental health , endocrinology
Studies on the Effects of Bacillus thuringiensis (Berl.) on Bupalus piniarius (L.) (Lep., Geom.), I. Part I deals with methodics and presents the general data of the three preparations studied: Thuricide 90 TS, Biotrol BTB and “Bac. thg. lab.” (own production). Furthermore the results of special experiments on relationships between mortality, nutrition, development, sex ratio and pupal weight of Bupalus piniarius are demonstrated. The numeric relation between the indices of toxicity was 1 (Thuricide): 4 Biotrol): 5 (“Bac. thg. lab.”), that of the indices of time of efficiency 1: 2.3: 4. The t 75 amounted to 6.8 (“Bac. thg. lab.”), 10 (Biotrol) and 24 days (Thuricide). After treatment with Thuricide for 6 days mortality of L 3 increased from 8 % (1.10 9 sp/ml) up to 40 % (2.10 9 sp/ml) and after treatment for 20 days from 62% up to 94 %. With same concentrations Biotrol showed an equal effect of about 50 % after 6 days and 100 % after 20 days. The effectiveness of Bac. thuringiensis depended as well on origin of larvae (population density) as on time of skinning. No premortal septikaemie was found in the larvae. There was neither a significant effect of Bac. thuringiensis on sex ratio nor pupal weight of Bupalus piniarius .