Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools . elementaryprinci02ferg Year: 1913 172 Elementary Principles of Agriculture well marked with dots and lines along the bodies, that are characteristic for each species. After a time they leave the tree and each individual spins a paper-like case, called a 'cocoon,' in some sheltered place. The adult moth emerges from the cocoon in a few weeks, and lays the eggs as mentioned above. These changes may be observed by bringing the almost mature caterpillars into wire-screened cages. Thes
Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools . elementaryprinci02ferg Year: 1913 172 Elementary Principles of Agriculture well marked with dots and lines along the bodies, that are characteristic for each species. After a time they leave the tree and each individual spins a paper-like case, called a 'cocoon,' in some sheltered place. The adult moth emerges from the cocoon in a few weeks, and lays the eggs as mentioned above. These changes may be observed by bringing the almost mature caterpillars into wire-screened cages. These caterpillars are attacked by many insect parasites, snakes, frogs, and particularly by birds. The orchard should be inspected in the early spring for webs. 238. 'Wire- rr^E^^^t^' worms' are very common in fields. They are the larval stage of various species of night-fly- ing beetles, such as the click- beetles. The adult lives on the nectar obtained from flowers X'lhWe the larval stage lives in the ground and thrives on the roots, leaves, and stem^s of young plants. 239. Plant-lice, or Aphids, are common everywhere. There are many kinds, and all are quite small. Plant-lice are soft- bodied, usually green, like the 'green bug,' but some forms are colored red or black or other color. Most of them are wingless, though some of them will have two pairs of transpar- Fig. 109. A corn-plant growing ia a root-cage infested by â wire-worms and click-beetles. After Comstock.
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