Fate of Spinosad in Litter and Soils of a Mixed Conifer Stand in the Acadian Forest Region of New Brunswick

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• 作者：Dean G. Thompson ; Brenda J. Harris ; Leonard J. Lanteigne ; Teresa M. Buscarini ; and Derek T. Chartrand
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2002
• 出版时间：February 13, 2002
• 年：2002
• 卷：50
• 期：4
• 页码：790 - 795
• 全文大小：82K
• 年卷期：v.50,no.4(February 13, 2002)
• ISSN：1520-5118

文摘

Spinosad is a natural insecticide, produced via fermentation culture of the actinomycete Saccharopolyspora spinosa, with potential use against a number of forest pests including spruce budworm(Choristoneura fumiferana [Clem]). Persistence of spinosad was determined in terrestrial fateexperiments conducted within a semimature stand of black spruce (Picea mariana [Mill.]) and balsamfir (Abies balsamea [L]) in the Acadian forest region of New Brunswick, Canada. Results of experimentsestablished under full coniferous canopy and in a canopy opening indicated that spinosad dissipatedrapidly following hyperbolic kinetics in both litter and soils and was not susceptible to leaching. Timeto 50% dissipation estimates for spinosyn A ranged from 2.0 to 12.4 days depending upon matrixand experimental conditions. Spinosyn D dissipated to levels below quantitation limits (0.02 mages/entities/mgr.gif">g/g ofdry mass) within 7 days in all cases. Sporadic low-level detection of the demethylated metabolitessuggested that parent compounds were degraded in situ.Keywords: Spinosad; spinosyns; degradation; leaching; soils; fate; forestry