Bioactivity of Dasanit in a Mineral Soil, in Rutabagas in the Field and in Storage, and Effect of Cooking on Toxicants in the Roots

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Abstract:

Bioassays on the toxicity of JOG Dasanit® (O-O-diethyl O-[p-methylsulfinyl) phenyl] phosphorothioate) , applied in a 4-in. band 3/4 in. below the soil surface in ridged rows in the field showed that initial toxicity to 1st-stage larvae of the cabbage maggot, Hylemya brassicae (Bouche) was moderate but decreased to near zero in about 4 days. Toxicity then increased to a peak between 15 and 30 days after application and thereafter decreased at a fairly constant rate. Bioassays on rutabagas grown in soil treated with 2.5 to 30 lb toxicant Dasanit per acre banded in the row prior to seeding indicated that toxicants of Dasanit were absorbed by rutabagas and reached a peak 60 to 80 days after planting. At rates of 10 lb per acre, toxicants present in the roots at 80 days killed all test larvae (when larger roots were 31/2 to 4 inches in diameter) , At the 2.5 and 5 Ib rates, toxicity reached a peak 70 to 80 days after planting and then decreased at a relatively constant rate. Toxicants were still detected at the normal time of harvest but decreased quickly to non-detectable levels in roots in storage. Even at the rate of 30 Ib (6 to 7 times the commercially recommended application), no toxicity was detected after 2 to 3 months in storage. Cooking destroyed approximately 55% of the toxicants present in samples tested at different times after harvesting.

Document Type: Research Article

Publication date: June 1, 1971

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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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