. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. Yellow starthistk (centmrea solstitmlis) - Category 3 Noxious Weed Yellow starthistle is commonly a winter annual but it can germinate and grow to maturity in one season. The plant is gray green in color with cottony hair on the leaves and stems. It reaches a height of 1 to 3 feet, is branched, and has a yellow flower on the end of each branch. The leaves are narrow with the base of the leaf extending along the stem, giving them a winged or ridged appearance. The flower is b
. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. Yellow starthistk (centmrea solstitmlis) - Category 3 Noxious Weed Yellow starthistle is commonly a winter annual but it can germinate and grow to maturity in one season. The plant is gray green in color with cottony hair on the leaves and stems. It reaches a height of 1 to 3 feet, is branched, and has a yellow flower on the end of each branch. The leaves are narrow with the base of the leaf extending along the stem, giving them a winged or ridged appearance. The flower is bright yellow and has long sharp rigid spines as bracts below each flower. Two types of seeds are produced; light colored with bristly awns and dark with no bristles. Yellow starthistle is found in cultivated and fallow fields, pastures, rangelands and waste places. It can invade range and pasture and competes well with existing vegetation. It crowds out existing grasses where moisture is limited and grasses are weakened from overgrazing. It produces a toxic chemical that can cause death in horses and the spines can cause serious injury to grazing animals. It has been reported in Montana in RavalU, Lake, Gallatin, and Liberty counties. It is a serious problem in Idaho and Washington. It should be eradicated when found in Montana. .^?^S. Yellow Starthistle A. Plant Habit B. Involucre C. Flower D. Achenes Helpful identification tip: Yellow spines up to 3/4 inch long extend from the involucre or seed case. 133. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Montana. Dept. of Agriculture; Hinck, Laura; Johnson, Kim; Mullin, Barbara H; Montana. Agricultural Sciences Division. Helena, Mont. : Montana Department of Agriculture
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