Seed Production and Control of Sicklepod (Senna obtusifolia) and Pitted Morningglory (Ipomoea lacunosa) with 2,4-D, Dicamba, and Glyphosate Combinations

• DOI: 10.1614/wt-d-15-00108.1
• Publication Date: 2015-09-09T16:26:44Z
• Authors: Ramon G. Leon; Jason A. Ferrell; Brent A. Sellers
• Keywords: Dicamba; Senna

Sicklepod and pitted morningglory are two of the most important weed species in row-crop production southeastern United States. The upcoming introduction soybean cotton varieties resistant to 2,4-D dicamba will increase reliance on these auxinic herbicides. However, it is not clear how herbicides affect sicklepod control. Field experiments were conducted 2013 2014 Jay, FL determine whether (560 1,120 g ae ha −1 ), (420 840 glyphosate (1,060 ) alone or combination applied when shoots 11 (early POST [EPOST]) 22 (late [LPOST]) cm long effectively control prevent seed morningglory. LPOST provided more effective than EPOST. This was attributed emergence seedlings after EPOST application. When tank mixed with dicamba, higher (78 89% 87 98% 2014, respectively) for single-herbicide treatments (45 77% 38 80% 6 wk treatment (WAT). Pitted affected by application timing, 91 100% WAT, which equivalent mixtures containing glyphosate. Dicamba at 420 had lowest (44 70% 82 86% respectively). plants that survived recovered from herbicide produced same number viable seeds as nontreated treatments. results present study indicated use provide adequate extended sicklepod, combine other be necessary manage adequately 2,4-D- dicamba-resistant cotton. Because a single capable producing abundant seeds, integrated approaches include PRE sequential options may ensure bank reductions.