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Biological Control of Saissetia nigra (Nietn.) in California1

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In California during the first half of the present century, the nigra scale, Saissetia nigra (Nietn.), a tropical insect, adapted itself to subtropical conditions and increased to very destructive numbers on various ornamental plants and native vegetation. The maximum population density occurred in 1939.The upward trend was then drastically reversed by the action of the hymenopterous endoparasite Metaphycus helvolus (Comp.), which had been colonized on nigra scale infestations in 1938. Within a few years the nigra scale population in California had fallen to a completely noneconmic density. The continual action of M. helvolus populations produced on associated scale insects against the nigra scale tends toward the eradication of the nigra scale.

Document Type: Research Article

Publication date: August 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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