Two PhytoGen cottonseed varieties reduce root-knot-nematode populations at levels equal to alternate rotation crops, according to trial data presented during the 2015 Beltwide Cotton Conferences in San Antonio.

PhytoGen Cotton Development Speciaist Russell Nuti, Ph.D., reported, “In multiple studies, we see about a 90 percent reduction in root-knot-nematode survival throughout the season. That’s as good as any rotation crop. It allows you to keep farming cotton on the same ground.”

Company development specialists recommend growers sample for nematodes just before or soon after harvest to determine the species of nematodes in each field to determine the need for a cotton variety that performs best with the species present. Variety selection is key in terms of nematode management options.

The two varieties of cotton with excellent resistance to root-knot-nematodes were bred to provide high-level nematode resistance in varieties suited for specific geographies. One works best in Texas and Oklahoma, and the other provides optimum performance in the Midsouth, Southeast and Mid-Atlantic. Both are early maturing varieties for use in fields with cotton root-knot-nematode pressure.

During Beltwide, two years of data from university studies, official variety trials, and on-farm trials managed by PhytoGen cotton development specialists were presented related to the two root-knot-nematode varities.

PhytoGen is an affiliate of Dow AgroSciences, and more information is available at