Abstract
In annual tests from 1954 through 1957 for the control of thrips, mainly Frankliniella occidentalis (Perg.), on seedling cotton near, Yuma, Arizona, 11 insecticides, including chlorinated hydrocarbons, phosphorus compounds and systemic insecticides were tested one or more times in foliage applications or seed treatments. In no case was there a significant increase in yields of seed cotton as compared with untreated plots, although thrips populations were at least temporarily reduced in numerous cases. Thrips populations were relatively light, except in 1954, in this area of comparatively low altitude.
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