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Evaluation of Staple Plus and Roundup Ultra Max Weed Control Programs
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ABSTRACT
Research was conducted in 2001 at the Northeast Research Station in St. Joseph, La on a silt loam soil (pH 6.8, OM 0.5%) to evaluate weed control programs with Staple Plus (pyrithiobac plus glyphosate) and Roundup Ultra Max (glyphosate). EPOST, MPOST, or LPOST application was to cotyledon to one, two to three, or three to four-leaf cotton, respectively. Staple Plus treatments were applied as Staple (pyrithiobac) plus glyphosate (Roundup Original). Treatments evaluated included Staple Plus (0.5 oz ai/A + 0.75 lb ai/A or 0.7 oz ai/A + 1.0 lb ai/A) applied MPOST; Staple Plus (0.3 oz ai/A + 0.5 lb ai/A) applied EPOST followed by Staple Plus (0.3 oz ai/A + 0.5 lb ai/A or 0.5 oz ai/A + 0.75 lb ai/A) applied LPOST; Staple Plus applied EPOST followed by LPOST (0.5 oz ai/A + 0.75 lb ai/A); glyphosate (Roundup Ultra Max) (0.75 or 1.0 lb ai/A) applied MPOST; glyphosate applied EPOST followed by LPOST (0.75 or 1.0 lb ai/A); and Staple plus Cotoran (fluometuron) (0.5 oz ai/A + 0.9 lb ai/A) applied PRE followed by Staple Plus (0.5 oz ai/A + 0.75 lb ai/A) applied LPOST. A nontreated control was included for comparison. Nonionic surfactant was included with all Staple Plus treatments at 0.25% v/v. Herbicides were applied broadcast to all rows of each 4 x 12 m, four row plot. Weeds evaluated included barnyardgrass (Echinochloa crus-galli L.), goosegrass (Eleusine indica), hemp sesbania (Sesbania exaltata), sicklepod (Senna obtusifolia), smooth pigweed (Amaranthus hybridus L.), pitted morningglory (Ipomoea lacunosa), and entireleaf morningglory (Ipomoea hederacea). Multiple weed flushes were observed due to above average rainfall season long. Efficacy of treatments was determined with a visual rating 21, 35, and 67 d after EPOST application. Late season rainfall resulted in heavy weed infestation and disease, therefore yield could not be determined. |
©National Cotton Council, Memphis TN |
Document last modified May 20, 2002
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