Zorial Mixtures with Cotoran or Karmex for Weed Control in Georgia Cotton

T. J. Holt, J. W. Wilcut, H. S. McLean, and J. S. Richburg, III


The weed spectrum in Georgia requires an integration of PPI, PRE, and POST herbicide application(s) or cultivation for profitable cotton production. Replicated studies were conducted at Plains and Tifton in 1992 and Tifton in 1993 to investigate the interaction of Zorial (1.2 lb ai/ac), Cotoran (1.5), Karmex (1.0), Zorial + Cotoran, or Zorial + Karmex applied PRE. Treflan was applied at 0.75 PPI to all plots. The effects of cultivation, Staple (0.063) applied POST, or Cotoran (1.0) + MSMA (2.0) applied post-directed following PRE treatments were also evaluated. Broadleaf weeds included common cocklebur, sicklepod, prickly sida, tall morningglory, Ipomoea morningglory species including entireleaf, pitted, and entireleaf, smallflower morningglory, and Florida beggarweed. Regardless of the POST inputs, the PRE tankmixtures of Zorial + Karmex and Zorial + Cotoran provided better season long broadleaf weed control than any of the herbicides applied PRE alone. Cultivation generally improved the weed control obtained with all PRE herbicide(s). Overall, broadleaf weed control was best with a PRE application of Zorial + Cotoran followed by a cultivation or post-directed application of Cotoran + MSMA. These systems also provided the highest seed cotton yields. Staple applied POST provided good to excellent control of smallflower morningglory, prickly sida, Ipomoea morningglory species, and Florida beggarweed but was not effective for sicklepod and tall morningglory. POST application, post-directed application, or cultivation did not provide acceptable weed control or seed cotton yields unless it was preceded by a PRE treatment.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pg. 1699
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998