Want to Shorten Range & Pasture’s Most (Un)Wanted Weeds List? Here’s How. From Absinth wormwood to Zanthoxylum fagara (lime pricklyash) and everywhere in between, different weeds wreak varying levels of havoc on pastures around the country. We surveyed Corteva Agriscience Range & Pasture Specialists to learn more about the most troublesome weeds. Check out these most wanted to see if your weed nemesis made the list.
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TROUBLESOME ANNUAL WEEDS TOP 5
triangular, toothed or lobed and rough. In each oval bur,
two female flowers are enclosed while male flowers are in clusters on short stalks. Treatment: Apply 12 to 16 fluid ounces of DuraCor herbicide per acre. Where a nonresidual option is preferred, apply 1 to 1.5 pints of PastureGard® HL herbicide per acre. Use the lower rate in the rate range when weeds are small and actively growing. Increase rate as season progresses and plants become more mature. #3 Common/Giant Ragweed Common/giant ragweed is an erect, branching summer annual. It reaches 1 to 4 feet tall and has many lobed leaves. The weed flowers in late summer, producing large amounts of wind-dispersed pollen. Treatment: Apply 12 to 16 fluid ounces of DuraCor or 1.2 to 1.5 pints of GrazonNext HL per acre. Use lower rates when weeds are small and actively growing. Increase rates as season progresses and plants become more mature.
#5 Spiny Amaranth/Pigweed Spiny amaranth — or pigweed — has erect stems that are rough and textured. The weed grows up to 6 feet tall. Leaves alternate on long stems and are dull green in color. Small green flowers are in dense spikes at stem tips and upper leaf axils. Each flower is surrounded by three shiny bracts, and seeds are small, shiny and black. Treatment: Apply 12 to 16 fluid ounces of DuraCor per acre. Use lower rates when weeds are small and actively growing. Increase rate as the season progresses and plants become more mature. #4 Wild Mustard Wild mustard is a winter annual or biennial that emerges in the fall. The lower egg-shaped leaves occur as a rosette in the fall. As the stem elongates in the spring, the upper leaves become progressively smaller. The telltale yellow flowers emerge in the early spring Treatment: Apply 1.5 to 2 ounces of Chaparral™ herbicide per acre or a combination of 16 fluid ounces of DuraCor plus 16 ounces of PastureGard HL herbicide per acre when plants are in the rosette stage (fall to early spring).
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#1 Horseweed/Marestail Horseweed, also known as marestail, is a tall-growing winter or summer annual. Its stem usually has short bristly white hairs with many alternate and lance-shaped leaves. It blooms June to August with numerous tiny, inconspicuous flowers. Treatment: Apply 12 to 16 fluid ounces of DuraCor® herbicide per acre or 1.5 to 2.1 pints of GrazonNext® HL herbicide per acre. #2 Common Cocklebur Common cocklebur has a taproot, is annual and bushy and reaches 2 to 4 feet tall. The leaves are alternate,
™ ® Trademarks of Corteva Agriscience and its affiliated companies. DuraCor ® and GrazonNext ® HL have no grazing or haying restrictions for any class of livestock, including lactating dairy cows, horses (including lactating mares) and meat animals prior to slaughter. Label precautions apply to forage treated with DuraCor or GrazonNext HL and to manure and urine from animals that have consumed treated forage. Consult the label for full details. DuraCor and GrazonNext are not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow label directions. ©2023 Corteva. 2
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