Submitted to: Cotton Research and Extension Report
Publication Type: Experiment Station
Publication Acceptance Date: 2/15/2008
Publication Date: 3/15/2008
Citation: Lawrence, K.S., Balkcom, K.S., Durbin, B. 2008. Cotton cultivar response to Temik 15G Plus Avicta in two tillage regimes in Alabama, 2007. Cotton Research and Extension Report. No. 32. p. 31-32.
Technical Abstract: Six cotton cultivars were evaluated for yield response to the root-knot nematode in a naturally infested field at the Field Crops Unit of the E.V. Smith Research Center near Shorter, AL. Plots consisted of four rows, 50 feet long, with 3-foot row spacing and were planted in a factorial arrangement in a randomized complete block design with five replications. Avicta was applied to the seed by the manufacturer. Temik 15G (5 pounds per acre) was applied at planting on May 16 in the seed furrow with chemical granular applicators attached to the planter. Orthene 90S (0.12 pound per acre) was applied to all plots as needed for thirps control. Rainfall was the limiting factor during the 2007 season; thus nematode pressure was moderate under these conditions. At planting, root-knot nematode numbers averaged 107 J2s per 150 cm3 of soil. Root-knot numbers of J2 from the soil and eggs from the roots varied between varieties and nematicide application. ST 5599BR root-knot numbers were numerically lower than all other cultivars, and all cultivars exhibited numerically greater numbers of root-knot nematodes in the control plots compared to the nematicide plots. ST 5599BR, DP 117B2RF, and DP 143B2RF did not produce a numerical yield increase with the namaticide combination of Temik 15G and Avicta; thus tolerance is a possibility under the environmental conditions of this growing season.