Nitrate as a Deterrent to Feeding by the Sweet clover Weevil1,2

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Potassium nitrate and ammonium nitrate had similar Deterring capabilities against Sitona cylindricollis F1'thraeus when mixed with hot-water extracts from Melilotus officinalis. Furthermore, weevil feeding on bioassay disks treated with mixtures of varying proportions of M. infesta and M. officinalis hot-water extracts was closely correlated (r = 0.98i, significant at I % level) with feeding predicted from the nitrate content of the mixture.

The nitrate contents of M. officinalis leaves were generally about 110 as high as levels observed in M. infesta leaves. Resistance to feeding was induced in M. officinalis leaves by administering sodium nitrate through excised stems. However, a nitrate content in M. officinalis from 2 to 4 times as high as that of M. infesta was required to give a similar level of resistance.

Document Type: Research Article

Publication date: October 1, 1969

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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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