. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 376 ECONOMIC ENTOMOLOGY as the Hessian-fly, the pea-weevil, the codling moth, the San Jose scale, the plum curculio, the apple maggot, grasshoppers and many others (Fig. 244). 4. Natural Enemies of Insects.—(a) Farmers and fruit-growers can do much to encourage the presence of insectivorous birds among the crops. These birds are most important in keeping injurious insects under Fig. 244.—The San Jose scale. {
. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 376 ECONOMIC ENTOMOLOGY as the Hessian-fly, the pea-weevil, the codling moth, the San Jose scale, the plum curculio, the apple maggot, grasshoppers and many others (Fig. 244). 4. Natural Enemies of Insects.—(a) Farmers and fruit-growers can do much to encourage the presence of insectivorous birds among the crops. These birds are most important in keeping injurious insects under Fig. 244.—The San Jose scale. {After Alwood.) (b) Frequently, too, hogs and poultry can be utilized to advantage in destroying white grubs, cutworms, grasshoppers, asparagus beetles, etc., in infested fields. (c) Lady-bird beetles, ground beetles, and other predaceous insects should be protected as far as possible (see Section relating to the Utilization of Parasites, p. 401). 5. Restriction and Exclusion of Foreign Insects.—It has been fre- quently pointed out in the preceding pages that many of the most. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lochhead, William, 1864-. Philadelphia, Blakiston
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
