ABSTRACT
Prowl (pendimethalin) + Cotoran (fluometuron) applied preemergence (PRE) and Prowl + Cotoran PRE followed by (fb) a postemergence treatment provided excellent (> 92%) control of Palmer amaranth (Amaranthus palmeri) 7 weeks after planting (WAP). Roundup Ultra (glyphosate) applied postemergence over-the-top (POST) without a soil-applied residual herbicide was less effective, and provided only 82 to 89% control. Roundup Ultra applied POST provided excellent control of Palmer amaranth that was present at the time of application, but the lack of residual activity resulted in substantial weed populations later in the growing season. Best control of ivyleaf morningglory (Ipomoea hederacea) was attained with systems that included Prowl + Cotoran PRE fb a postemergence treatment.
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