Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools . elementaryprinci02ferg Year: 1913 Insects on the Farm 161 arsenic compound by sprays. When they eat the leaves, they consume enough of the poison to induce their death, Paris green, London purple, and arsenate of lead are the most usual poisons. Grasshoppers, potato bugs and army worms may be killed in this way. In some por- tions of Texas there are leaf-cutting ants, which attack trees and cut and carry off nearly all the leaves. These ^M' Fig. 99. Squash bug. A, eggs on leaf;
Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools . elementaryprinci02ferg Year: 1913 Insects on the Farm 161 arsenic compound by sprays. When they eat the leaves, they consume enough of the poison to induce their death, Paris green, London purple, and arsenate of lead are the most usual poisons. Grasshoppers, potato bugs and army worms may be killed in this way. In some por- tions of Texas there are leaf-cutting ants, which attack trees and cut and carry off nearly all the leaves. These ^M' Fig. 99. Squash bug. A, eggs on leaf; b, egg-shell; c, d, e, f, nymphs; g, adult. After Chittenden. Bureau of Entomology, U. S. Department of Agriculture. ants do not eat the leaves, but carry them into their underground nests and use them as a medium or soil on which to grow a fungus which they do eat. These ants are real 'farmer insects,' in that the food they eat is grown by their own efforts. Carbon bisulfide, poured into their nest, may sometimes destroy the colony, (c) By Sucking the Juices. We may distinguish
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