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Broadleaf Weed Control in Sugarcane Curtis Rainbolt Sugarcane Extension Agent Spiny pigweed • Most common pigweed species – Stickerweed • Large, upright growth habit, entire leaves • Very evident spines located at nodes Alligatorweed • Common in many areas of the EAA – Prefers wet areas – Often spread by cultivation – Low growing • Hollow stems when growing in wet spots • Opposite leaves • Small white blooms Common lambsquarters • Common some years – Usually during the cooler months (Dec, Jan) – Can be difficult to control • Waxy leaf surface • Alternate leaves • Medium size lobes on leaves Common purslane • Very common – Probably not competitive – Prostrate growing – Succulent – Leaves small, smooth, opposite or alternate – Red stems – Controlled by most herbicides Common ragweed • Often found on ditch banks and field edges – Deeply dissected leaves – Many hairs on upper and lower surfaces – Long seedhead at top of plant – Yellow flowers Ragweed parthenium • Primarily ditchbanks – Less common than common ragweed – Leaves less deeply dissected • Divisions don’t go all the way to the stem – White flowers • Single, not multiples Dayflower • Common in open areas, field edges – Small, probably not competitive – Prostrate growth habit – Parallel veins on leaves • Actually a monocot, not a dicot – Blue flowers American black nightshade • Occasional weed in EAA – Problematic in vegetables (tomato, pepper) • Same family (Solanaceae) • Resistant to paraquat in some areas – Alternate leaves • Usually entire to somewhat lobed – Purple fruit – Competitive 2,4-D Amine • • • • Very versatile, useful product Controls most broadleaves Can use lower rates on smaller weeds At higher rates (2 lb ai) very good control of alligatorweed • Coverage is the key to good alligatorweed control Atrazine • Backbone of sugarcane weed control – Used both PRE and POST • PRE – Good soil activity (2-4 qt/A) – Controls most broadleaves – Suppress/control many grasses – Activity begins to fade 3-5 weeks after application – Broadleaf activity last longer than grass activity Diuron (Karmex/Direx/Etc) • Not used much – Sand soils (binds very strongly on muck) – Better control of broadleaves than grass – Not much experience • Crop injury? • Rate – 1.6 lb/A PRE Envoke • Excellent control of alligatorweed • Partial (slow acting) control of prostrate pigweeds • Partial control of Dayflower • Does not control American Black Nightshade or related species Evik (Ametryn) • Generally applied POST – Some is applied PRE • Controls many small grasses and broadleaves – Weeds need to be less than 4 inches – Directed application • Injury will be seen on treated foliage