Archive image from page 69 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 â 'iS. LSs: Fig 68 Spraying outfit that will give good service m an apple orchard of forty to sixty acres The arsenate of lead, which was first used against the gypsy-moth in 1892, is coming into general use. It adheres better to the foliage and can be used very strong with safety, thus making it especially useful against certain insects like the elm leaf-beetle, codling-moth, plum
Archive image from page 69 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 â 'iS. LSs: Fig 68 Spraying outfit that will give good service m an apple orchard of forty to sixty acres The arsenate of lead, which was first used against the gypsy-moth in 1892, is coming into general use. It adheres better to the foliage and can be used very strong with safety, thus making it especially useful against certain insects like the elm leaf-beetle, codling-moth, plum curculio, rose-chafer, and grape root-worm. It is sold in a paste form, one pound of which contains only about half as much arsenic as Paris green, thus necessitating using twice as much of the arsenate of lead, or 2 to 4 pounds per 100 gallons for apple orchards and 4 pounds per 50 gallons in vineyards for grape root-worms. Hellebore is still much used for currant-worms, but has been largely replaced by the Paris green spray. Sucking insects.âThe insecticides used for kill- ing sucking insects are largely powders, oils or soaps, which kill by contact or when they hit the body of the insect. Pyrethrum powder is often used for house-flies, but it is too expensive for general use in spraying. Tobacco in various forms is largely used for fighting plant-lice in greenhouses, and sometimes as a spray outdoors or in 'washes' or 'dips' for domestic animals. Tobacco stems may be burned slowly, creating a killing smoke, or tobacco dust may be freely scattered over the plant, or decoctions and extracts may be sprayed on the plants. Whale-oil and fish-oil soaps and various common soaps are effective insecticides for plant-lice, scale insects and many other sucking insects. Two pounds of soap dissolved in one gallon of water is the neces- sary strength for killing scale insects on dormant plants in winter, and one pound in four to six gal- lons will kill plant-lice and recently hatched sc
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