Evaluation of Variety Tolerance and Use of Vydate C-Lv for Management of Southern Root-Knot Nematodes

The southern root-knot nematode, Meoidogyne incognita, is an economically important parasite of cotton in Gaines County, Texas.  Higher populations of this pest tend to occur in sandier fields that have had consecutive cotton crops and very little rotation to a nonhost, such as peanuts. The objectives of this research were to evaluate the performance of ST 4288B2F and FM 9180B2F with an without the 3 weekly over-sprays of 17 oz of Vydate C-LV starting at three true leaves and to compare the net returns between varieties, use of Vydate C-LV, and the interaction between varieties and Vydate C-LV.  Gall ratings, in-season juvenile and eggs counts/cm³ soil provided further information on the presence and impact of root-knot nematodes.  The field trial was conducted in Gaines County, TX in 2011 in a field with a 5 year crop history of back to back cotton.   The field’s soil make up was 93% sand, 3% silt, and 4% clay.