Archive image from page 147 of Cyclopedia of farm crops . Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada cyclopediaoffarm00bailuoft Year: 1922, c1907 118 CHEMICAL WEED-KILLERS OR HERBICIDES the charlock, and this amount causes little or no damajje to the grain. This same treatment is reporttni to be more or less etfective against a variety of other common grain-field weeds. The Pig. 170. Pacific Coast poison oak (Rhus diversiloba). A trailing or climbing plant. wild turnip (Brassica campestris) and some allied cruciferous weeds
Archive image from page 147 of Cyclopedia of farm crops . Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada cyclopediaoffarm00bailuoft Year: 1922, c1907 118 CHEMICAL WEED-KILLERS OR HERBICIDES the charlock, and this amount causes little or no damajje to the grain. This same treatment is reporttni to be more or less etfective against a variety of other common grain-field weeds. The Pig. 170. Pacific Coast poison oak (Rhus diversiloba). A trailing or climbing plant. wild turnip (Brassica campestris) and some allied cruciferous weeds are less easily killed because the spray does not adhere to their smooth leaves. by the Cornell Station gave the following general conclusions: Wild mustard grow- ing with cereals or peas can be destroyed with a solution of copper sulfate, without injury to the crop. A 3 per cent solution (about 10 pounds to the barrel, or 40 gallons of water), at the rate of 40 to 50 gallons per acre, gives very satisfactory results. The following notes on the effect of the copper sulfate solution on different plants are from obser- vations and reports from various sources: 'Plants reported killed by copper sulfate solu- tions: wild mustard, wild radish, wild barley, penny-grass (if young), shepherd's-purse, wild buckwheat, lamb's-quarters, ragweed, sow-thistle, hemp-nettle, bindweed, dock, dodder. 'Plants reported severely injured: curly dock, black bindweed, dandelion, sow-thistle and senecio. 'Plants reported as not injured: wild rose, pop- pies, pigweed, spurge, corn-flower, field-thistles, chamomile, couch-grass, and horsetails. 'Crops that may safely be sprayed: all cereals, as wheat, rye, barley and corn; the grasses; peas; sugar-beets. 'Crops that are killed or severely injured by the copper sulfate solution : beans, potatoes, tur- nips, rape.' Laicn weeds.—Orange hawkweed (Hieraeium aurantiacum, Fig. ), chickweed {Stellaria media. Fig. 142), and some
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