EVALUATION OF THREE TREATMENTS TO CONTROL THE COMMON CITRUS PEST, ARGENTINE ANT Iridomymex humilis (Mayr)

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  • 1 Crop Science Department, California Polytechnic State University, San Luis Obispo, CA 93407

Three different treatments were evaluated for preventing the common citrus pest, Argentine ant Iridomymex humilis (Mayr), from foraging in skirt pruned citrus trees. The treatments were: 1) 1% (AI) chlorpyrifos 4 EC applied to the basal 15 cm portion of the trunk, 2) 32 g (AI) diazinon 14G broadcast in a 60 cm radius around the trunk, and 3) a trunk barrier of petroleum wax applied in a 10 cm wide strip around the trunk. The treatments were evaluated in two-week increments from August 1, 1991, to October 20, 1991, by counting the number of ants to cross an arbitrary line 10 cm above the soil surface on the trunk of each tree. Each of the three treatments resulted in a highly significant reduction in the number of ants entering trees compared to untreated control trees. There were no significant differences among the three treatments.

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