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Migration of Grasshoppers from Plots Sprayed with Dieldrin in a Saskatchewan Wheat Field1

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A field experiment is described in which the migration of grasshopper populations from plots sprayed with dieldrin was measured by the use of 2 fluorescent dyes. After I dye in aqueous solution had been sprayed on the plots with a hand sprayer, a second dye mixed with dieldrin was applied with a farm sprayer. Collections of grasshoppers were taken from inside and outside the test plots before and after the plots were sprayed. A sharp drop in the numbers of grasshoppers in the test plots was accompanied by a considerable rise in the population of the control plots, and many of these grasshoppers bore marks showing that they had come from the sprayed area. The effect of local migration on calculated mortality rates is discussed.

Document Type: Research Article

Publication date: February 1, 1968

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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