Project Summaries

12-133AL  Project Manager: P. F. O'Leary

EFFECTIVENESS OF DIFFERENT INSECTICIDES IN CONTROLLING SPIDER MITES AND APHIDS INFESTING COTTON

Tim Reed, Auburn University

Materials and Methods: Studies to evaluate the efficacy of different chemicals in controlling spider mites and aphids were conducted in  growers' fields  near  Belle Mina (Limestone county) and Moulton (Lawrence county), respectively. Chemical treatments used and rates applied are presented in Tables 1 and 2. There were 4 replications/treatment with treatments arranged in an RCB design in both tests. Spider mite treatments were applied June 27 using a tractor-mounted spray boom equipped with TX 10 conejet nozzles that delivered 15 gallons of spray/acre using 40 psi.  Aphid treatments were applied June 30 using a CO2 back- pack sprayer equipped with TX 10 conejet nozzles that delivered 16.3 gallons/acre using 38 psi. Spider mite counts were made 4 and 9 days after application (DAA).  Aphid counts were made 4 and 7 DAA. Yields were obtained by hand-harvesting 10 row ft/plot in the spider mite test and 5 row ft/plot in the aphid test. Results are presented in Tables 1 and 2. Number of spider mites and the percentage of leaves with spider mite eggs was significantly greater in the bifenthrin treatment  9 DAA  in comparison to all the other treatments including water. Thrips were observed feeding on mite eggs and bifenthrin may have reduced thrips predation.  All treatments significantly reduced aphid numbers in comparison to water both 4 and 7DAA. There were no statistically significant differences among treatments with respect to yield in either study.

 

Project Year: 2012
 

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