| Abstrakt: |
Southern Root-Knot nematodes are found in an estimated 60 to 70 percent of Georgia's cotton acreage. Medium to high populations are found in 41 of the state's 78 cotton-producing counties. Strategies to control nematodes and reduce yield loss include crop rotation to a non-host crop, use of nematicides, use of seed treatments, and use of nematode-resistant varieties if available. Studies were conducted a 3 locations in 2003 and 2004 to evaluate nematicide treatments. Yields, costs, and net returns were determined for each treatment at each location for each year. Each year, the untreated check was 3.5 lbs/acre of Temik applied in-furrow at planting. This is a standard practice for Georgia producers to control thrips and provides no nematode control. In 2003, this was compared to (a) a split application of Temik consisting at 5 lbs/acre at planting plus 5 lbs/ac side-dressed and (b) 3 gallons/acre of Telone plus 3.5 lbs/ac of Temik at planting. In 2004, the 3.5 lbs/acre Temik check was compared to (a) 5 lbs/acre of Temik at planting, (b) a split application of Temik consisting at 5 lbs/acre at planting plus 5 lbs/ac side-dressed and (c) 3 gallons/acre of Telone plus 3.5 lbs/ac of Temik at planting. In 2004, each treatment resulted in lowering average nematode populations compared to the check in 2 of 3 locations. Although not necessarily resulting in the lowest nematode populations, the split Temik treatment and Telone+Temik treatment resulted in the highest yield per acre at each location in 2004. Net returns were highest with the split Temik or Telone+Temik treatments at all 3 locations in 2004. In 2003, the differences in net returns were not as pronounced. The Telone+Temik treatment resulted in the highest net return at 1 location while there were no treatment effects at the other 2 locations. [ABSTRACT FROM AUTHOR] |
