Residual Poison Sprays Against the Onion Thrips on Carnations

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The onion thrips, Thrips tabaci Lind., is so injurious to greenhouse carnations in eastern Washington that they may become entirely unsaleable. Damage occurs during the early fall, spring and summer. These seasons are characterized by intense sunlight, high temperatures, and low humidity; climatic conditions which apparently favor the rapid multiplication of thrips. In feeding, the onion thrips punctures the pigment cells on the surface of the petals and ingests the fluid contents. As a result decolorized areas, commonly referred to as “flecks,” appear on dark varieties (Fig. 1) and brown petal edges develop on light varieties.

Document Type: Research Article

Publication date: December 1, 1940

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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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