Russian knapweed (Centaurea repens )
Chemical Control
Desription of Plant:
The stems of Russian knapweed are erect and branched openly, they can be from 18 to 36 inches tall. Lower leaves are 2 to 4 inches long and the upper leaves are very narrow and shorter. The roots can be from 6 to 27 roots per square foot, they also can grow to a depth of 23 feet. The flowers are cone-shaped and the heads are 1/4 to ½ inches in diameter. Flowering occurs from June to August. The flowers have a thistle like texture, are 1/3 to 1/4" in diameter and are lavender to white in color. The seeds are flattened, ivory color, 2-3 mm long, 2 mm broad, 1 mm thick, and have small bristles.Useful Herbicides:
2, 4-D (Amine,LV Esters), Tordon 22K/Tordon 101, Touchdown 600
Herbicide Brand How to Apply When to Apply 2, 4-D (Amine,LV Esters) Broadcast Before Full Flower Or Fall Regrowth Tordon 22K/Tordon 101 Broadcast Before Full Flower Or Fall Regrowth Touchdown 600 Broadcast Before Full Flower Or Fall Regrowth
Further Information About These Herbicides:
Herbicide Brand Active Ingredient Mode of Action 2, 4-D (LV ester) 2, 4-D (LV ester) Growth Regulator Herbicide Touchdown 600 Chemical fallow: Banvel, (or 2,4-D Amine) + non-ionic surfactant.
Non-ionic surfactants: Agral 90, Ag-Surf, Frigate, Companion, Enhance.Moves from the foliage into the roots and kills the entire plant. Tordon 22K/Tordon 101 Tordon 101 plus Sodium TCA, Tordon 101 plus Sylgard. Growth Regulator Herbicide
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Don't let bad weeds do this to your mind!
By: Ryan Hunt 1/23/03