. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. Russim KMjJwed (cmtaurca rcycm) - Category I Noxious Weed Russian knapweed is a bushy, branched perennial plant reproducing by seed and underground rhizomes. The roots are characteristically black in color and have a scaly appearance. The stems are erect, 2 to 3 feet tall, branched at the base, ridged and have a dense gray hair-like covering. The basal leaves are hairy and the upper leaves are small and linear with smooth edges. The intermediate leaves have slightly toothed
. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. Russim KMjJwed (cmtaurca rcycm) - Category I Noxious Weed Russian knapweed is a bushy, branched perennial plant reproducing by seed and underground rhizomes. The roots are characteristically black in color and have a scaly appearance. The stems are erect, 2 to 3 feet tall, branched at the base, ridged and have a dense gray hair-like covering. The basal leaves are hairy and the upper leaves are small and linear with smooth edges. The intermediate leaves have slightly toothed margins. The flowers are 1/2 inch wide, rose to purple composite heads and solitary on the ends of leafy branches. The seeds are grajdsh to yellow, smooth, flattened, oval, and about 1/8 of an inch long. The flowers generally bloom from June to August. Russian knapweed was introduced from southern Russia and Asia. It grows in pastures, grain fields, cultivated fields, meadows, waste places, roadsides, and irrigation ditches. It is found throughout Montana. Once established it will completely crowd out other vegetation. fi^'^hi. Russian PCnapweed A. Plant Habit B. Head C. Bracts D. Flower E. Achene Helpful identification tip: Bracts under the flower are rounded with pointed papery tips. |,,,|,..l.,.' 132. 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
Size: 1305px × 1915px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionamericana, bookl, booksubjectweeds
