Elementary principles of agriculture; a Elementary principles of agriculture; a text book for the common schools . elementaryprinci00ferg Year: 1908 CHAPTER XXIII SOME SPECIAL INJURIOUS INSECTS 233. Insects that Attack Cotton. There are several species of insects that injure the cotton plant, such as the cotton army or leaf-worm, cotton boll-worm, the Mexican boll-weevil, and the cotton aphis. The leaf- worm and boll-worm may be destroyed by spraying or dusting with arsenical poisons. 234. The Boll-Worm of cotton, damages cotton by destroying the locks of the bolls. The same insect damages th
Elementary principles of agriculture; a Elementary principles of agriculture; a text book for the common schools . elementaryprinci00ferg Year: 1908 CHAPTER XXIII SOME SPECIAL INJURIOUS INSECTS 233. Insects that Attack Cotton. There are several species of insects that injure the cotton plant, such as the cotton army or leaf-worm, cotton boll-worm, the Mexican boll-weevil, and the cotton aphis. The leaf- worm and boll-worm may be destroyed by spraying or dusting with arsenical poisons. 234. The Boll-Worm of cotton, damages cotton by destroying the locks of the bolls. The same insect damages the tips of more than 75 per cent of the ears in the corn fields. The damage to corn ears is probably fully 3 to 5 per cent of the crop. The pupae hibernate in the ground through the fall and winter and do not mature into moths until late in the spring. These facts suggest the advisability of early fall plowing to expose the pupa to the severe weather conditions of the winter seasons, predacious insects and birds. (What other reasons have already been mentioned for early plowing?) Advantage is taken of the habit of the insect of attacking corn and cowpeas in preference to cotton, to protect the latter. 'Trap rows' of corn and cowpeas are planted near the cotton to attract the moths. In this way the damage to the cotton is lessened. Corn is used, also, in pro- (165) Fig. 104. Mexican Cotton- boll weevil. (Enlarged five times.) Howard, United States Depart- ment of Agriculture.
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