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Effects of PIX, a Plant Growth Regulator, on Allelochemical Content of Cotton and Growth of Tobacco Budworm Larvae (Lepidoptera: Noctuidae)

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In 1982, second-instar tobacco budworms, Heliothis virescens (F.), were fed leaves, bracts, and squares without bracts (buds) of 'Stoneville 213' cotton, Gossypium hirsutum L., treated with PIX (1,1-dimethyl-piperidinium chloride). PIX was applied at rates 0.0, 0.4, 1.3, and 3.9 liters/ha. Two applications of PIX were made 2 weeks apart. Plant tissues were analyzed for allelochemicals. Relative growth rate (RGR), relative consumption rate (RCR), and efficiency of conversion of ingested food to body tissue (ECI) were measured. Gossypol in buds and leaves was increased by the application of PIX; however, anthocyanin in buds and tannin and total flavonoids in leaves were decreased. Treatment with PIX did not decrease the nutritional indices of larvae. Other than an increase in larval RGR on leaves, PIX had no major effects on nutritional indices. The increase in RGR on leaves possibly was due to decreases in tannin and total flavonoids and possible increases in percentage nitrogen. RGR was greatest on buds while ECI was greatest on leaves. In a test of 'Stoneville 213' bud parts, anthers were more nutritious than petals or calyx.

Document Type: Research Article

Publication date: October 1, 1985

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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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