The aerobic soil degradation of spinosad ‐ a novel natural insect control agent
| Autor: | David E. Portwood, Kerry A. Hale |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Journal of Environmental Science and Health, Part B. 31:477-484 |
| ISSN: | 1532-4109 0360-1234 |
| DOI: | 10.1080/03601239609373010 |
| Popis: | Spinosad is a natural product with biological activity against a range of insects including lepidoptera. It is comprised of two major components namely spinosyns A and D. The degradation of spinosad in soil under aerobic conditions was investigated using two U.S. soils (a silt loam and a sandy loam) which were treated with either 14C‐spinosyn A or ‐spinosyn D at a 2X use rate of 0.4mg/kg soil for spinosyn A and 0.1mg/kg for spinosyn D. Further samples of soil were pre‐sterilised prior to treatment in order to establish whether spinosyns A and D degrade abiotically. Flasks of treated soil were incubated in the dark at 25°C for up to one year after treatment. HPLC and LC‐MS of soil extracts confirmed that the major degradation product of spinosyn A was spinosyn B, resulting from demethylation on the forosamine sugar. Other degradâtes were hydroxylation products of spinosyns A and B, with hydroxylation probably taking place on the aglycone portion of the molecule. Half lives were similar for both sp... |
| Databáze: | OpenAIRE |
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