. Cyclopedia of farm crops, a popular survey of crops and crop-making methods in the United States and Canada;. Farm produce; Agriculture. MEANS OP CONTROLLING INSECTS 41 can not wait but must usually resort to artificial insecticides to save his crops. For centuries man has been fighting insect enemies. The Greeks mixed hellebore with milk to kill iiies, and the. Fig. 59. A hopper-dozer at work in kaflr com. (Kansas Experiment Station Bulletin.) Romans required the inhabitants of infested regions to kill certain amounts of grasshoppers. In the middle ages the methods used for the destruction
. Cyclopedia of farm crops, a popular survey of crops and crop-making methods in the United States and Canada;. Farm produce; Agriculture. MEANS OP CONTROLLING INSECTS 41 can not wait but must usually resort to artificial insecticides to save his crops. For centuries man has been fighting insect enemies. The Greeks mixed hellebore with milk to kill iiies, and the. Fig. 59. A hopper-dozer at work in kaflr com. (Kansas Experiment Station Bulletin.) Romans required the inhabitants of infested regions to kill certain amounts of grasshoppers. In the middle ages the methods used for the destruction of insects were largely of a spiritual nature; priests marched around infested fields praying; anathemas were pronounced over grasshoppers; or the accused insects were summoned to appear in court and judgment was rendered in the form of an excommunication. Scarcely thirty years ago, two governors of states in America issued procla- mations appointing days of fasting and prayer to stop the ravages of Rocky mountain locusts. It is only within the past quarter of a century that most of the modern scientific methods of control- ling insect pests have been devised. Previously, American farmers resorted to hand-work or to simple mechanical devices, such as bands for canker-worms and codling-moth. The word "in- secticide " was unknown half a century ago, and, according to the dictionaries when man kills an • insect he is an insecticide, he may use an insecti- cide, and he also commits an insecticide. Usually, however, the word is restricted to some material or spray used by man to kill insects. We may classify the methods used against insect pests as: international, national, state, local or neighborhood and individual. The first three of these mostly comprise laws or commercial regula- lations, by the enforcement of which attempts are made to prevent the spread of insect pests from one country or state to another, and also to provide for the introduction of beneficial ins
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