Effect of Dichlorodiphenyl Dichloroethane on Larvae of the Clear Lake Gnat in California

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Abstract
Two California lakes were sprayed with TDE-xylene emulsion for the control of Chaoborus astictopus. The emulsion contained 30 g. of TDE, 10 cc. of araralkyl polyether alcohol (Triton X-100), and 72 cc. of xylene (crude). Lower Blue Lake containing 775 acre feet was sprayed in Nov. 1947 with a concn. of 1 part of TDE to 45 million parts of water. Chaoborus larvae were reduced to zero within 96 days. Chironomid larvae were eliminated 13 days after treatment, but recovered in 356 days. Oligochaeta and Culicoides were not reduced in numbers. Detert Reservoir, containing 490 acre feet, was sprayed in Oct., 1948, at rate of 1 part of insecticide to 75 million parts of water. No larvae were found 194 days after treatment. The chironomids were eliminated, but Oiigochaeta were not injured. No damage to fish life occurred.

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