. Adventures with animals and plants. Biology. PROBLEM 3. Honj) We Try to Solve Our Insect Froblems 395. Fig. 344 One iicst of tent caterpillars may eat all the leaves from a small tree. The caterpillars return to their vest at night. At that tinie they can be destroyed by bnrning the nest, (general BIOLOGICAL SUPPLY HOUSE) plies with such rapidity that in some years it causes losses in the grain fields of the Mississippi and Missouri valleys that amount to millions of dollars. The eggs are laid in the ground or on the young stems of grains or wild grasses. After five or six weeks the bugs are
. Adventures with animals and plants. Biology. PROBLEM 3. Honj) We Try to Solve Our Insect Froblems 395. Fig. 344 One iicst of tent caterpillars may eat all the leaves from a small tree. The caterpillars return to their vest at night. At that tinie they can be destroyed by bnrning the nest, (general BIOLOGICAL SUPPLY HOUSE) plies with such rapidity that in some years it causes losses in the grain fields of the Mississippi and Missouri valleys that amount to millions of dollars. The eggs are laid in the ground or on the young stems of grains or wild grasses. After five or six weeks the bugs are full-grown and by this time their feeding ground is pretty well exhausted. Then they migrate in vast hordes. Though they have wings they march on foot to a neighboring field. They move forward blindly so that millions can often be trapped in ditches filled with kerosene. This is only one of several ways in w^hich the farmer fights this destructive insect. Can you think of some other possible ways? The gypsy moth, which is common in the eastern states from Maine to New Jersey, strips and, in time, may kill trees. The larvae (caterpillars) eat leaves of al- most any kind, even the needles of ever- greens. The eggs which are laid during the summer in large masses near the ground hatch early the following spring. Figure 343 is a photograph of the dark, hairy, little caterpillars moving up a tree trunk. One of the best ways to protect individual trees is to circle the trunk with a band of sticky material which traps the caterpillar. Destroying insects with stomach poi- sons. Poisons of various kinds, frequently arsenic compounds such as Paris green, are sprayed on plants. Other poisonous compounds are dusted on. Sometimes this is done on a large scale by using air- planes. By these means we can kill in- sects with biting mouth parts which feed on the exposed parts of plants. Stomach poisons can be used success- fully against the larva of the cabbage butterfly. This is a small white
Size: 1719px × 1454px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
