dc.contributor.author |
Car, M.
|
|
dc.contributor.editor |
Bigalke, R.D. |
|
dc.date.accessioned |
2015-11-05T11:01:00Z |
|
dc.date.available |
2015-11-05T11:01:00Z |
|
dc.date.created |
2015 |
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dc.date.issued |
1984 |
|
dc.description |
The articles have been scanned in colour with a HP Scanjet 5590; 600dpi.
Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format. |
en_ZA |
dc.description.abstract |
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) 20m 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". |
en_ZA |
dc.description.librarian |
am2015 |
en_ZA |
dc.identifier.citation |
Car, M. 1984, 'Laboratory and field trials with two Bacillus thuringiensis var. israelensis products for Simulium (Diptera: Nematocera) control in a small polluted river in South Africa', Onderstepoort Journal of Veterinary Research, vol. 51, no. 2, pp. 141-144. |
en_ZA |
dc.identifier.issn |
0330-2465 |
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dc.identifier.uri |
http://hdl.handle.net/2263/50375 |
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dc.language.iso |
en |
en_ZA |
dc.publisher |
Published by The Government Printer, Pretoria |
en_ZA |
dc.rights |
©ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). ©University of Pretoria. Dept. of Library Services (digital). |
en_ZA |
dc.subject |
Veterinary medicine |
en_ZA |
dc.subject.lcsh |
Veterinary medicine -- South Africa |
|
dc.title |
Laboratory and field trials with two Bacillus thuringiensis var. israelensis products for Simulium (Diptera: Nematocera) control in a small polluted river in South Africa |
en_ZA |
dc.type |
Article |
en_ZA |