Summary of DPX-PE350 Efficacy Trials in Arkansas

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


 
ABSTRACT

DPX-PE350, previously KIH-8921, is being developed for postemergence broadleaf weed control in cotton (Gossypium hirsutum L.). Experiments were conducted from 1989 through 1991 in six replicated trials to determine the effects of application rate and timing on efficacy of DPX-PE350 on broadleaf weeds typically found in cotton. DPX-PE350 was applied at rates of 0.05, 0.10, and 0.15 lb ai/acre at the cotyledon (cot.) to 1-leaf (1f) and 4- to 6-lf stages. A non-ionic surfactant (0.25%) was included with all treatments. Treatments were applied in 20 gal./acre. Species evaluated included velvetleaf (Abutilon theophrasti Medicus), pitted morningglory (Ipomoea lacunosa L.), entireleaf morningglory (Ipomoea hederacea var. inteciriuscula Gray), sicklepod (Cassia obtusifolia L.), tall morningglory (Ipomoea purpurea L. Roth.), palmleaf morningglory (Ipomoea wrightii Gray), hemp sesbania (Sesbania exaltata L.), and prickly sida (Sida spinosa L.). Plots were established by planting seeds in rows 1 ft. apart. Treatments then were applied perpendicular to the weed rows at the appropriate growth stage. Visual estimates of percent control were taken approximately 3 weeks after application.

Pooled over the six locations, control of velvetleaf, pitted morningglory, entireleaf morningglory, palmleaf morningglory, hemp sesbania, and prickly sida averaged 92% or greater when DPX-PE350 was applied at 0.05, 0.10, or 0.15 lbs/acre at the cot. to 1-lf stage. Sicklepod was controlled 25, 42, and 53% with 0.05, 0.10, and 0.15 lb/acre, respectively; while tall morningglory control averaged 33, 49, and 73%, respectively, with these rates. Delaying applications until the 4- to 6-lf stage resulted in a decrease in control and an increase in variability across trials. Tall morningglory and sicklepod control averaged 36% or less at the 4- to 6-lf stage. However, the range of tall morningglory control varied as much as 60% among trials. Sicklepod control was 33% or less in all trials regardless of the rate applied. Control of velvetleaf, pitted morningglory, entireleaf morningglory, palmleaf morningglory, hemp sesbania, and prickly sida with 0.05 lb/acre averaged 82, 68, 84, 66, 72, and 59%, respectively. Control of these species with 0.10 and 0.15 lb/acre was 78% or greater at this stage of application.



Reprinted from 1992 Proceedings Beltwide Cotton Conferences pg. 1317
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998