Constituents of the Cotton Bud. IX. Further Studies on a Polar Boll Weevil1 Feeding Stimulant Complex2,3,4

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Techniques were used to concentrate and fractionate the polar feeding stimulant for the boll weevil, Anthonomus grandis Boheman, that is found in the buds of cotton, Gossypiun hirsutum L., Delta Pine Smooth Leaf. An active fraction could be extracted from freeze-dehydrated bud powder with water after successive extractions with several less polar solvents and, consequently, after removal of hydrocarbons, carotenoids, terpenoids, and flavonoids. The major active polar principle extractable with water was not absorbed on a weak cation exchange resin and was precipitated with lead ions. Studies by gel permeation suggested a moderate molecular weight <2000) for the active constituent (s) and eliminated proteins. large peptides, and polysaccharides with high molecular weights. Moderate feeding activity was found in methanol extracts of cotton buds in a fraction containing acidic components, but no active phenolic or carboxylic acid was. isolated. Strong feeding activity was retained after fractions from methanol extracts were treated to remove or degrade flavonoid glycosides (and other glycosides), although 2 flavonoids with modest activity were isolated.

Document Type: Research Article

Publication date: February 1, 1968

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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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