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Paper chromatography of freeze-dried larvae of Mayetiola destructor (Say) in a solvent system of 1-butanol:methanol:water, 80:5: 15, isolated a peak of plant-growth-promoting substance at R, 0.15-0.25. This growth promoter was detected also on chromatograms of stomachs and carcasses of fresh larvae but was absent from chromatograms of larvae collected from 'Knox 62' wheat, triticum aestivum L, a cultivar resistant to the Hessian fly, or from chromatograms of larvae that had never fed. Paper chromatograms of ethanol extracts of both infested and uninfested wheat plants revealed that feeding by the larvae did not reduce the amount of the growth promoter, but benzene extracts of infested plants produced chromatograms with more peaks of growth- inhibiting substances than did benzene extracts of un- infested plants. The inhibitors in the benzene extracts of infested plants may be the reaction of the wheat plant to secretions introduced into the plant by the feeding larvae. Therefore, the most likely cause of stunting of winter wheat by the Hessian fly is the result of some- thing discharged into the plant by the Hessian fly larva as it feeds.
Document Type: Research Article
Publication date: August 1, 1972
More about this publication?
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.