Contact Toxicity of Five Insecticides to California Oakworm1 Reared on an Artificial Diet2

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Five insecticides were tested by topical application to 3rd- and 4th-stage larvae of Phryganidia californica Packard. The decreasing order of toxicity at LD50was: pyrethrins, Zectran® (4-dimethylamino-3,5-xylyl methyl- carbamate), p,p'DDT, carbaryl, and malathion. At LD90 the decreasing order became: pyrethrins, Zectran, p,p'- DDT, malathion. and carbaryl. A low slope of the re- gression curve for carbaryl suggests that small gains in mortality would be achieved at the expense of large increments of dosage. Pyrcthrins, Zectran, and malathion seem to be likely candidates for field testing.

Document Type: Research Article

Publication date: February 1, 1971

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