. Cyclopedia of farm crops, a popular survey of crops and crop-making methods in the United States and Canada;. Farm produce; Agriculture. 118 CHEMICAL WEED-KILLERS OR HERBICIDES the charlock, and this amount causes little or no damage to the grain. This same treatment is reported to be more or less effective against a variety of other common grain-field weeds. The. Fie. 170. Pacific Coast poison oak {Rhus diversiloba). A trailing or climbing plant. â wild turnip (Brasswa campestris) and some allied cruciferous weeds are less easily killed because the spray does not adhere to their smooth leav
. Cyclopedia of farm crops, a popular survey of crops and crop-making methods in the United States and Canada;. Farm produce; Agriculture. 118 CHEMICAL WEED-KILLERS OR HERBICIDES the charlock, and this amount causes little or no damage to the grain. This same treatment is reported to be more or less effective against a variety of other common grain-field weeds. The. Fie. 170. Pacific Coast poison oak {Rhus diversiloba). A trailing or climbing plant. â wild turnip (Brasswa campestris) and some allied cruciferous weeds are less easily killed because the spray does not adhere to their smooth leaves. Experiments 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, gjvesvery 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, bent-grass and horsetails. "Crops that may safely be sprayed: all cereals, as wheat, rye,.barley and porn; the grasses; peas; sugar-beets. "Crops that are killed or severely injured by the copper sulfate solution: beans, potatoes, tur- nips, ; Lawn weeds.âOrange hawkweed (Hieracium aurantiacum, Pig. 156-7), chickweed (Stellaria media, Fig. 142), and some other of the shallow- rooted succulent weeds of lawns
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