BIENNIAL AND PERENNIAL WEEDS TOP 5
#2 Canada Thistle (perennial) Canada thistle is erect, up to 4 feet tall, with tremendous leaf variability. Leaves vary from light to dark green and are oblong or lance-shaped, deeply cut, often with spiny-toothed margins, and slightly hairy below. Flowers are small, bristly clusters and light lavender to deep rose purple. Plants are male and female. Treatment: Apply 16 to 20 fluid ounces of DuraCor per acre or 1.5 to 2.1 pints of GrazonNext HL per acre. Apply after the first buds form in late spring. This timing provides the best compromise between Canada thistle emergence and stage of growth of older plants. Fall to early winter applications of DuraCor can be made prior to the first hard frost. #3 Silverleaf Nightshade Silverleaf nightshade has foliage with gray or silvery appearance with violet, light blue or white flowers and is 1 to 3 feet tall. Stems are sparsely covered with short, yellow thorns. Leaves and stems have a dense silvery covering of hair. Treatment: Apply 12 to 16 fluid ounces of DuraCor per acre or 1.5 to 2.1 pints of GrazonNext HL per acre during bloom. Use higher rate in range when flowering or when weeds are larger. Re-treatment is necessary for total control.
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#4 Tall & Western Ironweed Tall and western ironweed are lump- forming perennial herbs with erect stems 2 to 4 feet tall and reproduce by rhizomes and seed. Long, lance-shaped leaves are sharply toothed with short hairs on the lower surface. Reddish purple flowers are arranged along slender branches at top of plant. Treatment: Apply 12 to 16 fluid ounces of DuraCor herbicide per acre before flowering, during vegetative stage (starting when plants are about 10 inches in height) prior to bloom. Use higher rate in range when weeds are larger.
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#1 Bull, Musk and Plumeless Thistle (biennials) Bull Thistle: This erect, 2- to 5-foot- tall weed has many spreading branches and spiny wings from leaves. Rosette forms first year; flowering stem elongates second year. Leaves have short prickles on the surface and are cottony below. Flowers are dark purple and somewhat clustered. Musk Thistle: This erect, freely branching weed reaches up to 7 feet tall. Leaves are dark green with light midrib and hairless on both sides, with long, sharp spines. Flowers are deep rose to purple, up to 3 inches in diameter. Plumeless Thistle: This branching plant has spiny wings that extend up to flowers. Stems grow 1 to 4 feet tall. Rarely flowers the first year; when it flowers, the blooms are purple to pink, 1 to 2 inches in diameter, and solitary or in clusters of two to five. Bracts are sparsely to densely hairy. Treatment: Apply 16 to 20 fluid ounces of DuraCor® herbicide per acre or 1.2 to 1.5 pints of GrazonNext® HL herbicide per acre during the rosette stage early in the season. Fall to early winter applications can be made to rosettes prior to the first hard frost.
#5 Carolina and
Western Horsenettle Carolina and western horsenettle have erect stems, loosely branched and covered with gray hairs, and yellow spines. The weeds grow to 2 feet tall. Leaves are dark green, oval, pointed at tip, and sharply lobed or wavy-toothed. Clusters of white to purple flowers look like tomato flowers. Bloom is May to October when yellow-orange berries form. Berries are poisonous. Treatment: Apply 12 to 16 fluid ounces of DuraCor per acre or 1.5 to 2.1 pints of GrazonNext HL per acre. Spray when plants begin to flower in the early summer.
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