Summary of DPX-PE350 Cotton Response Trails in Arkansas

D.L. Jordan, R.E. Frans, and X.R. McClelland


 
ABSTRACT

DPX-PE350, previously KIH-8921, is being developed for broadleaf weed control in cotton (Gossypium hirsutum L.). Experiments were conducted from 1989 through 1991 in four sets of experiments to determine cotton response to applications of DPX-PE350. In one experiment, DPX-PE350 (KIH-8921) was applied postemergence over-the-top (POT) at the early pinhead square stage of cotton at rates of 0.05, 0.10, and 0.20 lb ai/acre. The experiment was conducted in 1989 and 1990 at both Marianna, AR (Calloway silt loam) and Clarkedale, AR (Sharkey silty clay). In experiment 2, DPX-PE350 was applied POT at approximately the 1-leaf (1f.), 3-1f., and 6-1f. Stages of growth at rates of 0.10 and 0.15 lb/acre. The experiment was conducted in 1989 and 1990 at Marianna and in 1991 at Clarkedale. In experiments 1 and 2, the cultivars 'Stoneville 835' and 'Deltapine 50' were grown at Marianna and Clarkedale, respectively. In experiment 3, DPX-PE350 (KIH-8921) was applied POT at 0.15 lb/acre to cotton which had received differing in-furrow insecticide treatments. Insecticide treatments included a no insecticide check phorate, aldicarb, and disulfoton each applied at a rate of 1.0 lb/acre. KIH-8921 was applied at the V2 stage of cotton. The experiments were conducted in 1989 and 1990 at Keiser on a Sharkey silty clay. The cotton cultivar was 'Deltapine 50.' The final experiment was conducted at Marianna (Calloway silt loam) in 1989 and at Clarkedale (Sharkey silty clay and Dundee silt loam) in 1990. The experiment was conducted on a Sharkey silty clay and Dundee silt loam at Clarkedale. DPX-PE350 was applied preplant incorporated (PPI), preemergence (PRE), and POT at the cotyledon stage, and POT at the V2 stage of cotton at rates of 0.125 and 0.25 lb/acre. The cultivars 'Stoneville 825' and 'Deltapine 50' was grown at Marianna and Clarkedale, respectively. An untreated check was included in all experiments. Treatments were applied in 20 gallons/acre. A nonionic surfactant (0.25% v/v) was included in all POT applications.

Less than 15% injury was observed from POT applications of DPX-PE350. In all experiments, there were no reductions in seed cotton yield from POT applications regardless of application rate or timing. In-furrow insecticides had no effect on cotton response to DPXPE350. Some cotton injury occurred from DPX-PE350 applied PPI and PRE at 0.25 lb/acre. On the Dundee silt loam, cotton was injured approximately 50% with PRE applications compared to 30% from PPI applications. On the Sharkey silt clay there were no differences in injury from PPI and PRE applications. Pooled over both soils, seed cotton yield was reduced approximately 15% when DPXPE350 was applied PRE at 0.25 lb/acre.



Reprinted from 1992 Proceedings Beltwide Cotton Conferences pg. 1314
©National Cotton Council, Memphis TN

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page
 
Document last modified Sunday, Dec 6 1998