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Competition Among Larvae of Hippelates collusor (Diptera: Chloropidae) as a Natural Control Factor

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Abstract:

Competition in the laboratory among larvae of Hippelates Collusor Townsend on the roots of millet seedlings reached an intensity that has not been observed under field conditions in southern California. Crowded populations resulted in fewer and smaller adults than uncrowded populations. when the oven-dry weight of emerged adults fell below about O.50x 10-4g. it represented competition at its greatest intensity .. Additional crowding at this point resulted in a den-case of adult development, accompanied by a further weight loss. Dispersal was considered a means by which larvae in nature escape the severe competition such as occurred these experiments. laboratory tests demonstrated that hatched larvae dispersed at' random from egg inoculation sites permitting the mean weight of resulting adults to surpass 0.66x10-4g, a degree of competition apparently tolerated by a large percentage of the population, since continued movement was possible as shown by its occurrence with a smaller percentage of individuals.

The indication of larval dispersion away from inoculation sites offers a possible explanation for low recoveries of adults from artificially inoculated field plots. Such dispersal increases their exposure to destructive natural physical and biotic agents. One stimulus to dispersal may involve the excretion of undesirable levels of biologically active substances by the larvae themselves at high densities.

Document Type: Research Article

Publication date: December 1, 1966

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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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