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Various estimates of the loss have been made, and in general it is believed that it causes the loss of one-fourth to one-half of the apple crop of the United States each year. The plum-curculio attacks nearly all stone fruits. Its natural food plant is probably the native wild plum, and the plum continues to be its favorite food, consequently this fruit suffers most from the attacks of the insect.
This method will also destroy the plum-curculio in orchards. In attempting to control the boll-weevil of the cotton fields, it has been found that the best method to pursue is the simple one of planting the crop very early, so that the cotton passes the danger stage before the insects emerge, and removing all the plants in the fall.
Annual Loss Occasioned by Destructive Insects. Value of Insect Parasitism to the American Farmer. Yearbook 1907. House Flies. Dept. of Agriculture. Bulletin 71. The Grasshopper Problem. Bulletin 84. The Boll-Weevil Problem. Bulletin 344. The Most Important Step in the Control of the Boll-Weevil. Bulletin 95. The San Jose Scale. Yearbook 1902. The Plum-Curculio. Bulletin 73.
The seventeen species of titmice which inhabit the United States, and many of which remain all winter, are all insect eaters to a great extent, eating large quantities of tent-caterpillars, moths and their eggs, weevils, including the cotton boll-weevil, plum-curculio, ants, spiders, plant-lice, bugs and beetles. They also eat small seeds, particularly those of the poison ivy.
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