Chemistry and biological activity of insect feeding deterrents from certain weed and crop plants
1978
JACOBSON, M. | REED, D.K. | CRYSTAL, M.M. | MORENO, D.S. | SODERSTROM, E.L.
Concentrations of 0.01-1.0% of a hexane extract of the seed of neem, Azadirachta indica A. Juss., and several of its chromatographic fractions significantly deterred feeding by three species of scale insects, citrus red mites, and woolly whiteflies. An ether extract of the hexane-extracted seed reduced egg deposition by driedfruit beetles, the ether and ethanol extracts repelled adults and larvae of this insect, and the hexane extract repelled only adults. A concentration of 1% of a pentane extract of the nuts of tung, Aleurites fordii Hemsl., considerably deterred feeding by adult boll weevils; a concentration of 0.1% of an ether extract of the defatted nuts reduced feeding by striped cucumber beetles and plum curculios; and a concentration of 0.2% reduced feeding by spotted cucumber beetles. Also, these extracts, and ethanolic and aqueous extracts as well deterred feeding by larvae of the codling moth and redbanded leafroller. Several polar and nonpolar components of neem seeds and tung nuts appear to be responsible for the antifeedant properties of these plant materials.
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