Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 144 ELEMENTARY STUDIES IN INSECT LIFE senites. They can, however, be reached by what we speak of as contact poisons, the best of which is kerosene emul- sion. (For directions for making, see page 305.) This spray is a contact poison, since it kills the insect by com- ing in contact with its body, and not by entering the ali- mentary canal as is the case with arsenical poisons. Since these insects spend the winter in the adult stage in rubbish left about the garden plots or fields where vines
Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 144 ELEMENTARY STUDIES IN INSECT LIFE senites. They can, however, be reached by what we speak of as contact poisons, the best of which is kerosene emul- sion. (For directions for making, see page 305.) This spray is a contact poison, since it kills the insect by com- ing in contact with its body, and not by entering the ali- mentary canal as is the case with arsenical poisons. Since these insects spend the winter in the adult stage in rubbish left about the garden plots or fields where vines of this family are cultivated, all such refuse allowed to remain favors their hibernation. In the fall, then, all vines and rubbish about garden plots should be raked up and burned, and in so doing many of the insects will doubtless be destroyed at the same time. The -Farmers who are engaged in the production of cabbage for market, as well as those Fia. 115. Cabbage butterfly (Picris rapce), parent of the cabbage-worm. Drawn from nature, by Miss M. E. Wise. who raise only for home consumption, find considerable difficulty with the small greenish worm known as the cabbage-worm. The parents of this cabbage-worm were brought from Europe. They are about one and one-half inches in wing expanse, white or creamy white in color. The male has a single black spot in the fore rapce.
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