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Colorado Potato Beetle Control Tests with Carbaryl, Dipel, and Carbaryl-Dipel Combinations, 1979


 Observations from previous field tests suggested that a Sevin - Bacillus thuringiensis mixture may have provided better control of Colorado potato beetle (CPB) than Sevin alone. The test reported here was designed to investigate this combination and was conducted at the North Alabama Horticulture Substation, Cullman. Red LaSoda Irish potatoes were planted 20 Mar 1979 in rows with 44 inch centers. Plots were 4 rows by 10 ft with 4 replications in a randomized complete block design. Treatments were all possible combinations of 5 levels of Dipel and 4 levels of Sevin. Treatments were applied on 18 May using knapsack sprayers. Prespray, 4, and 14 day larval postspray counts were made. Prespray larval counts averaged 10.25 ± 6.0 larvae/plant. Adults were present on plants but contributed less than 2% of the total CPB population.