Effect of Time of Application of DDT on Lygus Bug Populations and Yield of Lima Beans

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Abstract
In experiments conducted in southern California in 1952-57 a single early or blossom application and a single intermediate application in late July when small pods were present gave significant increases in yield of beans, each being superior to a single late application made in August. A late application to plots treated early did not further increase the yield. All these treatments significantly reduced the percentage of pitted beans, the intermediate and the early-plus-late applications being responsible for the greatest reductions. Peak populations of lygus during the first half of August indicated the necessity for applying an insecticide 2 weeks after blossoming, or in the latter half of July, to prevent damage to small and half-mature pods present on the plants in August. The intermediate application made about this time was the most effective in reducing corn ear worm damage to pods and beans.

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