Authors: RICHARDSON, CHARLES H.; HAAS, LOUISE E.

Source: Journal of Economic Entomology, Volume 25, Number 5, October 1932 , pp. 1078-1088(11)

Publisher: Entomological Society of America

Abstract:

Adults of the red-legged grasshopper, Melanoplus femur-rubrum (Deg.) and the differential grasshopper, M. differentialis (Thomas) were fed determined quantities of bran, molasses and water bait which contained known concentrations of arsenious oxide, monosodium arsenite in solution, trisodium arsenite in solution, Paris green, acid lead arsenate, sodium fluosilicate or rotenone. The method is described. The estimated median lethal dose (M.L.D.) of arsenious oxide is 0.36 milligram per gram of body weight. For the sodium arsenites, Paris green and sodium fluosilicate, the M.L.Ds. are approximately equal and estimated to be about 0.16 mg./gram. The M.L.D. for acid lead arsenate is> 3.0 mg./gram and for rotenone probably >2.0 mg./gram. For survival periods less than 96 hours, monosodium arsenate was more toxic than the other compounds. Under experimental conditions, the grasshoppers were not repelled by the odor or taste of the bait mixtures used, and ceased to feed only when they became satiated or were too sick to eat more. If undisturbed, they usually consumed a toxic dose of an active poison before leaving the bait.

Document Type: Research article

Publication date: 1932-10-01

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.
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