Elementary principles of agriculture; a Elementary principles of agriculture; a text book for the common schools . elementaryprinci00ferg Year: 1908 Some Special Injurious Insects 169 covered in the United States. Birds, snakes and pre- daceous insects assist man in holding the boll-weevil under control, but no fact has yet been discovered that suggests that it will not spread over the entire cotton- growing section. 237. Tent Caterpillars are often found in fruit trees. They are easily discovered in the spring by their large webs supported on the branches. They may be found much earlier as s
Elementary principles of agriculture; a Elementary principles of agriculture; a text book for the common schools . elementaryprinci00ferg Year: 1908 Some Special Injurious Insects 169 covered in the United States. Birds, snakes and pre- daceous insects assist man in holding the boll-weevil under control, but no fact has yet been discovered that suggests that it will not spread over the entire cotton- growing section. 237. Tent Caterpillars are often found in fruit trees. They are easily discovered in the spring by their large webs supported on the branches. They may be found much earlier as small bunches of eggs, like those shown in Fig. 108c. They are laid late in the summer and cov- ered by a sticky substance to pro- tect them from the winter rains. They hatch out usually just about the time the buds open and the caterpil- lars feed on the young buds and leaves. They soon spin a delicate cloth-like web or tent, to which they retire at night, and in bad weather. These caterpillars are well marked with dots and lines along the bodies that are character- istic for each spe- cies. After a time Fig. 108. The tent-caterpillar, c, egg-cluster; d, cocoon; ( a and b, larv; full-grown.
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