Dry farming in western Canada . dryfarminginwes00brac Year: 1921 WEEDS AND THEIR CONTROL 217 Among the influences by which man aids weed distribu- tion are (1) importing weedy foodstuffs including hay, (2) sowing impure seed, (3) neglecting road allowances and railway rights-of-way and freight yards, (4) using weed-infested, undecayed farm yard manure, (5) cus- tom threshing, and (6) by tillage machinery in moving from dirty roads or fields to clean fields. ****»&&)0y>5x TUMBLING MUSTARD. Fig. 77.—Tumbling Mustard Piling Up Against a Fence. The Russian Thistle, another weed of tumbling
Dry farming in western Canada . dryfarminginwes00brac Year: 1921 WEEDS AND THEIR CONTROL 217 Among the influences by which man aids weed distribu- tion are (1) importing weedy foodstuffs including hay, (2) sowing impure seed, (3) neglecting road allowances and railway rights-of-way and freight yards, (4) using weed-infested, undecayed farm yard manure, (5) cus- tom threshing, and (6) by tillage machinery in moving from dirty roads or fields to clean fields. ****»&&)0y>5x TUMBLING MUSTARD. Fig. 77.—Tumbling Mustard Piling Up Against a Fence. The Russian Thistle, another weed of tumbling habit is a serious menace to farmers in South Western Manitoba, South Western Saskat- chewan and Southern Alberta. The chief natural agencies resulting in the distribu- tion of weeds are the wind, water, animals and birds. The wind scatters (a) fluffy or hairy seeds such as Dandelion, Canada thistle and Sow thistle, (b) winged seeds such as Dock and Parsnip, (c) seeds having ex- ten, led edges such as Penny Cress, (d) plants that roll like Russian thistle and Tumbling mustard, (e) sticky seeds like Plantain adhering to weeds that blow, and (f) weed seeds in drifting soils. Irrigation water, flood streams, and rapid 'run off' water also distribute
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