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- W2016741766 abstract "Abstract Laboratory trials were conducted on the effect of larval overcrowding of Culex pipiens molestus and Theobaldia longiareolata on the biolethal efficacy of Bacillus thuringiensis var. israelensis against third and fourth instars of the first mosquito species as well as the third instar larvae of the second species. It was disclosed that there was a distinct biolethal efficacy of the bacteria against the third instar larvae of the two species on the density levels 25, 50, 75 and 100 larvae/200 ml water. The highest density levels (125 and 200 larvae/200 ml water) tolerated the effect of the bacteria. However, the fourth instar larvae of C. pipiens molestus exhibited comparable response to the biolethal effect of the bacteria in all the experimental density levels of larvae. It might be indicated that the third instar larvae of T. longiareolata exhibited higher response to B. thuringiensis var. israelensis compared with C. pipiens molestus in all density levels. Hence, larval density in mosquito breeding places should be considered as a factor which interfers with biological application of the bacterium in mosquito larvae management. Zusammenfassung Zur Wirkung von overcrowding auf die Insektizität von Bacillus thuringiensis var. israelensis gegen Larven der Stechmücken Culex pipiens molestus und Theobaldia longiareolata Es wurden Laborversuche über das Zusammenwirken von B. t. var. israelensis und overcrowding bei den Dritt‐ und Viert‐Larven von C. p. molestus sowie den Dritt‐Larven von T. longiareolata durchgeführt. Es zeigte sich, daß die Bacillus‐Wirkung auf die Dritt‐Larven der 2 Mückenarten bei Dichtewerten von 25, 50, 75 und 100 Larven pro 200 ml Wasser vergleichbar waren. Bei höchster Dichte (125 und 200 Larven/200 ml Wasser) machte das overcrowding die Bacillus‐Wirkung zunichte. Bei den Viert‐Larven von C. p. molestus zeigte die Bacillus‐Wirkung keine deutliche Abhängigkeit von der Larvendichte. Allgemein erwiesen sich die Dritt‐Larven empfindlicher gegenüber dem Bacillus als die Viert‐Larven. Somit steht die Mückenlarven‐Dichte zur Bacillus‐Wirkung in Beziehung, was bei biolgischen Bekämpfungsaktionen zu beachten ist." @default.
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- W2016741766 date "1983-01-12" @default.
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- W2016741766 title "Effect of overcrowding on the biolethal efficacy of Bacillus thuringiensis var. israelensis against Culex pipiens molestus and Theobaldia longiareolata larvae" @default.
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- W2016741766 doi "https://doi.org/10.1111/j.1439-0418.1983.tb02667.x" @default.
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