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Toxicity of Rapeseed Meal and Methyl Isothiocyanate to Larvae of the Black Vine Weevil (Coleoptera: Curculionidae)

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Abstract:

Soil amendments of Brassica spp. tissues display toxic effects to a number of soil organisms, including insects. However, application rates necessary to obtain effective insect suppression have not been determined. We tested the toxicity of soil amended with rapeseed, Brassica napus L., seed meal or methyl isothiocyanate to black vine weevil, Otiorhynchus sulcatus (F.), larvae. Control treatments included untreated soil and soil treated with detoxified rapeseed meal. Larvae were e1o.posedto treated soil for 24 h; those remaining motionless 30 min after their extraction from soil were recorded as dead. Mortality data were analyzed assuming the probit model. We estimated LC5l1s to be 19 g of rapeseed meal or 6 mg of methyl isothiocyanate per kilogram of soil. Total conversion of rapeseed meal glucosinolates (123 ┬Ámol/g) could produce up to 44.30 ┬Ámol/g of isothiocyanates; however, the actual production was ≍15% of the expected value. Lethal concentrations of rapeseed meal necessary for effective control in a nursery or field application may be too high for practical use because of low glucosinolate content in commercially grown rapeseed and canola cultivars. Consequently, Brassica spp. tissues containing higher concentrations of isothiocyanate-generating glucosi-nolates would have greater insecticidal potential.

Document Type: Research Article

Publication date: February 1, 1997

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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