Effects of Plant Pathogens on the Fate of Soil-Applied (14C]Carbofuran in Corn Plants

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The effects of common root rot and leaf rust diseases of corn plants on the translocation and metabolism of soil-applied (5 ppm) [14C]carbofuranin corn were investigated. The corn diseases studied were caused by the fungi Giberella zeae (Schw.) Petch or Puccinia sorghi Schw., respectively. Both root rot and leaf rust affected the translocation of [14C]carbofuranfrom soils into the plant tissue. Soil-applied radiocarbon accumulated in the diseased organs of the plants, i.e., in roots of corn with root rot and in leaves of plants with rust, which contained 1.4 and 1.7 times more radiocarbon than roots or leaves from control plants, respectively. The amounts of 14C translocated into leaves were directly related to the transpiration stream, which was increased in both root rot and leaf rust-infected plants. Carbofuran was the major compound recovered from control leaves, amounting to 42% of all organic-soluble radiocarbon present. Similar amounts were isolated as 3-hydroxycarbofuran. Leaves from plants with root rot, however, contained primarily 3-hydroxycarbofuran(50% of organic-soluble 14C)and considerably less carbofuran (24% of organic-soluble 14C). Conversely, leaves with rust contained more carbofuran (47% of organic-soluble 14C) and slightly less 3-hydroxycarbofuran than did control leaves. Based on analyses by gas-liquid chromatography, concentrations of carbofuran in leaves from control plants and from plants with root rot or rust amounted to 8.8, 3.7, and 16.7 ppm, respectively.

Document Type: Research Article

Publication date: October 1, 1983

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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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