A FOUR YEAR STUDY OF CHAPERONE IN THE MISSISSIPPI DELTA

摘要

Four years of Chaparone testing were conducted on the Westside Farm of Mr. John Mc Kee with the fourth continuous year being 2004. Yield increases were found each of the four years with the Chaparone treatments compared to untreated checks. Lint yields for years where direct rate comparisons could be made show a 12.2% yield increase with the five ounce early bloom rate, 13.4% with the 10 ounce early bloom rate, 18.5% increase with the five ounce rate applied at match head square and early bloom, anda 20.7% increase with 10 ounces applied at match head square and early bloom. Similar increases in bolls picked were found. In 2003 plant sap nitrate levels were monitored after the Chaparone treatments, and elevated nitrate levels were found in the Chaparone treatments compared to the untreated cotton. A caged bollworm efficacy trial was conducted in 2003. First instar bollworms were caged on blooms in Bollgard cotton. Mortality was checked 72 hours after the larvae were placed in the blooms. Increased bollworm mortality was found at 5, 10, 15, and 21 days following a five ounce treatment of Chaparone. This increased mortality, however, may not be enough to make a difference in making pest management decisions.