Residual Poison Sprays Against the Onion Thrips on Carnations1

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Abstract
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.

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