Abstract
A glass vial technique was developed to estimate the toxicity of oregano phosphorus, carbonate, cyclocliene, and pyre throed insecticides to the boll weevil, Anthonomus grandis grandis Bohemian, and to monitor field populations for tolerance to such insecticides. In tests in which responses of the USDA Ebony strain boll weevils were compared With those collected in the field in the Bravos Valley, TX, in 1988, tolerance to oregano phosphorus, pyre throed, and carbonate insecticides was demonstrated. The usefulness of the glass vial technique for monitoring tolerance was confirmed in 1991 and 1992 by field data from Texas, Arkansas, Mississippi, Oklahoma, and Sonora, Mexico. These tests indicated tolerance to oregano phosphorus and pyre throed insecticides in several boll weevil populations. Tolerance monitoring may be a useful technique in the implementation of boll weevil eradication programs.
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