Document Detail


Laboratory and field trials with two Bacillus thuringiensis var. israelensis products for Simulium(Diptera: Nematocera) control in a small polluted river in South Africa.
MedLine Citation:
PMID:  6493728     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects on Simulium adersi and S. hargreavesi larvae of 2 Bacillus thuringiensis var. israelensis products, the liquid formulation "Teknar" (Sandoz) and a powder formulation produced by the Ben Gurion University, Israel, were compared in the laboratory and in the Pienaars River. This river was heavily polluted with effluent from a nearby sewage works and contained 77 mg/l chloride. In the laboratory S. adersi and S. hargreavesi larvae showed 26; 48; 95 and 100% mortality 6 hours after a 10-minute application of 0,8; 1,6; 3,2 and 16 ppm "Teknar" in rain water. The powder formulation applied at 0,2; 1,0; 2,0 and 30 ppm resulted in a 7; 17; 35 and 100% mortality. In polluted river-water the mortality was 85% with 16 ppm "Teknar" and 80% with 30 ppm B. thuringiensis powder. In the field trials "Teknar" at 1,6 ppm and B. thuringiensis powder at 3 ppm did not cause any larval mortality at flow rates of 3 060 l/min and 2 040 l/min, respectively. However, 24 hours after application of the powder formulation, numbers of S. hargreavesi decreased significantly (P = 0,05) 20 m below the application point. A further 24 hours later, after "Teknar" had been applied, the numbers of S. adersi decreased and those of Chironomidae increased significantly. There was a significant increase in S. hargreavesi 200 m downstream after treatment with "Teknar".
Authors:
M Car
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Onderstepoort journal of veterinary research     Volume:  51     ISSN:  0030-2465     ISO Abbreviation:  Onderstepoort J. Vet. Res.     Publication Date:  1984 Jun 
Date Detail:
Created Date:  1984-12-13     Completed Date:  1984-12-13     Revised Date:  2006-04-19    
Medline Journal Info:
Nlm Unique ID:  0401107     Medline TA:  Onderstepoort J Vet Res     Country:  SOUTH AFRICA    
Other Details:
Languages:  eng     Pagination:  141-4     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Bacillus thuringiensis*
Chlorides / analysis
Fresh Water / analysis
Pest Control, Biological / methods*
Sewage
Simuliidae*
Chemical
Reg. No./Substance:
0/Chlorides; 0/Sewage

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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