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Response of the Pea Aphid to Chemical Repellents1

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During 1956-57 a series of tests were conducted with methyl pentanone, camphene, 10-undecenoic acid and paradichlorobenzene against the pea aphid (Macrosiphum pisi(Harris)) in an olfactometer and in the field to evaluate the effect of some of the factors determining the degree of repellency. The factors determined were the effect of concentration, the presence or absence of winged forms, laboratory-reared versus field-collected, number of test cages and the different test materials varied, but concentration and the length of exposure of a treated surface to an air stream had the greatest effect on the index of repellency. All of the materials tested rested resulted in fair or good repellency of pea aphids in laboratory tests. In field tests no repellency was experienced. It was concluded that since no material was repellent for more than 4½ hours in the laboratory, and field counts were not made for 24 hours after application that any initial repellency had disappeared before field counts were made.

Paradichlorobenzene was more repellent toward the winged form of M. pisi than the wingless form, while camphene and methyl pentanone were slightly more repellent to the wingless forms. Ten-undecenoic acid exhibited no important differences between the strains. Very little difference existed between the repellents, indicating that differences in vitality did not account for differences between laboratory and field tests.

Document Type: Research Article

Publication date: February 1, 1959

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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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