. Cyclopedia of farm crops. Farm produce; Agriculture. '' ^7*^~ V.^ ->ââ '^*^ F 6 Two ho se spray mach ne for g apes water or Bordeaux mixture, for general orchard spraying ; for potato-beetles, double the dose of poison. More than 2,000 tons of Paris green are now used annually in America against insect pests. It is the standard poison spray, and is used at the rate of 1 pound in 100 gallons on orchards, except plum and peach, where only about half this amount is safe ; on potatoes it is used at least twice as strong. The arsenite of copper or green arsenite is simi- lar to Paris green. WW
. Cyclopedia of farm crops. Farm produce; Agriculture. '' ^7*^~ V.^ ->ââ '^*^ F 6 Two ho se spray mach ne for g apes water or Bordeaux mixture, for general orchard spraying ; for potato-beetles, double the dose of poison. More than 2,000 tons of Paris green are now used annually in America against insect pests. It is the standard poison spray, and is used at the rate of 1 pound in 100 gallons on orchards, except plum and peach, where only about half this amount is safe ; on potatoes it is used at least twice as strong. The arsenite of copper or green arsenite is simi- lar to Paris green. WWn. Fig 68 Spraying outfit that will give good service in 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 e
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