Pacific Southwest Research Station

Publication Information

Title: Contact toxicity of 40 insecticides tested on pandora moth larvae

Author: Lyon, Robert L.

Date: 1971

Source: Res. Note PSW-RN-235. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 4 p

Station ID: RN-PSW-235

Description: Forty insecticides and an antifeeding compound were tested on pandora moth larvae (Coloradia pandora Blake) in the second and third instars. A total of 21 insecticides were more toxic at LD₉₀ than DDT, providing a good choice of candidates for field testing. Ten exceeded DDT in toxicity tenfold or more. These were, in descending order of toxicity at LD₉₀: pyrethrins, tetramethrin, Zectran MA (a degradation product of Zectran), Dursban, N-4543, allethrin, aminocarb, B-10119, Zectran, and dichlorvos. Pyrethrins, more toxic by an order of magnitude than the second place candidate, appear to be especially promising.

Key Words: Coloradia pandora, insecticides, toxicity tests, pyrethrins, pyrethroids

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Lyon, Robert L.   1971.  Contact toxicity of 40 insecticides tested on pandora moth larvae  Res. Note PSW-RN-235. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 4 p.