Toxicity and Affecting Factors of Bacillus thuringiensis var. Israelensis on Chironomus kiiensis Larvae

Bacillus thuringiensis var. israelensis (Bti) is a suitable agent for controlling Chironomus kiiensis, a major pest polluting water. In this study, laboratory bioassays were used to study toxicity and affecting factors of Bti on C. kiiensis larvae. Tests were conducted using three commercial Bti for...

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Published inJournal of Insect Science Vol. 12; no. 126; pp. 1 - 8
Main Authors Cao, Chuan-Wang, Sun, Li-Li, Wen, Rong-Rong, Li, Xiao-Peng, Wu, Hong-Qu, Wang, Zhi-Ying
Format Journal Article
LanguageEnglish
Published United States University of Wisconsin Library 2012
Oxford University Press
Subjects
Animals
autoclaving
Bacillus thuringiensis
Bacillus thuringiensis subsp. israelensis
bioassay
bioassays
Biological assay
Biological Control Agents
Chironomidae - growth & development
Chironomus
Control
Diptera
Dose-Response Relationship, Drug
instars
Larva
larvae
lethal concentration 50
Lethal Dose 50
oils
Pest Control, Biological
Pests
Population Density
Powders - pharmacology
Properties
rearing
sand
soil
Temperature
toxicity
China
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Summary:Bacillus thuringiensis var. israelensis (Bti) is a suitable agent for controlling Chironomus kiiensis, a major pest polluting water. In this study, laboratory bioassays were used to study toxicity and affecting factors of Bti on C. kiiensis larvae. Tests were conducted using three commercial Bti formulations (oil miscible suspension, 1,200 ITU/mL; wettable power, 1,200 ITU/mg; technical material, 5,000 ITU/mg) of Bti. The toxicity of Bti formulations to third and fourth instar C. kiiensis larvae was in decreasing order of technical material, oil miscible suspension, and wettable powder, based on the 12 and 24 hour LC50 values. Increasing larval densities (from 10 to 30 per bioassay cup) increased the LC50 values for fourth instar C. kiiensis larvae. The LC50 values for fourth instar larvae reared in sand substrate were higher than those from soil substrate, and autoclaved substrates significantly increased the LC50 values. The technical material of Bti at 12 and 24 hours responded similarly to changes in temperature between 30° C and 15° C, but the LC50 values at a range of tested temperatures showed distinct differences in time points.
Bibliography:http://www.insectscience.org/12.126/
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Editor: Karl Gordon was editor of this paper.
ISSN:1536-2442
1536-2442
DOI:10.1673/031.012.12601