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Chaperone on Cotton, A Three Year Study

Joe Townsend

ABSTRACT

Three years of Chaperone tests on the Westside Farm of Mr. John Mc Kee gave significant yield increases each year. The three year average yield increase was 12.2% for the 5 ounce rate applied early bloom, and 12.6% for the 10 ounce rate applied early bloom. The number of bolls harvested was also significant for all three years of the study. In 2003 plant sap nitrate was monitored after application, and elevated nitrate levels were shown for the Chaperone treatments. A caged bollworm efficacy trial was also conducted in 2003. First instar bollworms were caged on blooms in Delta Pine 555 cotton. Mortality was checked 72 hours after the larvae were placed in the blooms. This process was continued to give mortality at 5, 10, 15, and 21 days following the Chaperone treatment. An increase in mortality was noted. However, the increase may not be enough to allow the increased mortality to be a factor in making pest management decisions in Bt cotton.





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Document last modified 04/27/04