Effects of DPX-PE350 on Weed Control and Cotton Growth and Yield

C.T. Bryson, C.E. Snipes, and D.R. Shaw


 
ABSTRACT

Field experiments were conducted in 1990 at the Delta Research and Extension Center (DREC) and Southern Weed Science Laboratory Research Farm (SWSL) at Stoneville, Mississippi, and Mississippi State University (MSU), Starkville, Mississippi, to evaluate the efficacy of DPX-PE350 on weed control and cotton growth and yield. DPX-PE350 was applied preplant incorporated (PPI), preemergence (PRE), and postemergence over-the-top (POT) at 0.4, 0.8, 1.2, 1.6, 2.0, and 2.4 oz ai/A on common cocklebur, hemp sesbania, morningglories, prickly sida, and velvetleaf in cotton. Each treatment was compared to standard cotton herbicide treatments of Cotoran + Zorial at 1.5 lb ai/A each PRE, Cotoran or Probe at 0.5 and 1.0 lb ai/A, respectively + MSMA at 2.0 lb ai/A postemergence directed (PDS) at DREC; Cotoran + Zorial at 1.5 lb ai/A each PRE at MSU; and Cotoran + Zorial at 1.0 lb ai/A each at SWSL. Herbicides were applied in water at 20 gal/A. POT treatments were applied broadcast with a nonionic surfactant at 0.25% v/v on 1- to 3-, 3- to 4-, and 3-to 6-inch cotton. Cotton cultivars 'Deltapine 50', 'DES 119', and 'Stoneville 506' were planted in the tests at MSU, DREC, and SWSL, respectively. In general, maximum visual cotton injury was <5% following POT treatments with DPX-PE350. Cotton injury ranged from 10 to 43% and 10 to 22% at 0.8 to 2.4 oz/A for PPI and PRE application, respectively at 2 to 4 weeks after treatment. There was no cotton injury at ò8 weeks after treatment with DPX-PE350 applied PPI, PRE, or POT. Cotton yields were unaffected when DPX-PE350 was applied PPT, PRE, or POT. Entireleaf and ivyleaf morningglory (Ipomoea hederacea) were 10 to 20% more susceptible to DPX-PE350 applied PPI, PRE, or POT than pitted morningglory (I. lacunosa L.). DPX-PE350 at 0.8 to 2.4 oz/A more effectively controlled hemp sesbania [Sesbania exaltata (Raf.) Rydb. ex A. W. Hill] when applied POT (95 to 100%) than PPI or PRE (52 to 85%, respectively). DPX-PE350 at 0.8 oz/A gave greater control of prickly sida (Sida spinosa L.) when applied PRE (94%) than POT (88%) at DREC but prickly sida control was equivalent with DPX-PE350 at 0.8 oz/A gave greater control of prickly sida (Sida spinosa L.) when applied PRE (94%) the POT (88%) at DREC but prickly sida control was equivalent with DPX-PE350 at 0.8 oz/A applied PRE and POT (88%) at SWSL. Prickly sida control with rate ò1.2 oz/A with DPX-PE350 was equivalent for PRE and POT at DREC> Hemp sesbania, morningglory, prickly sida, and velvetleaf control with a single treatment of DPX_PE350 at ò2.0 oz/A POT was equivalent to Zorial + Cotran PRE or PROBE + MSMA PDS. Based on these experiments, the new experimental herbicide DPX-PE350 will be invaluable for effective weed management in cotton when applied early POT.



Reprinted from 1991 Proceedings Beltwide Cotton Conferences pg. 957
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998