. Elementary principles of agriculture; a text book for the common schools. Agriculture. 158 Elernentary Principles of Agriculture. ting off young plants near the ground. They are the caterpillar stage of several kinds of night-flying moths. (Fig. 98.) 230. How Insects Get Their Food, (a) By Living inside the Plant. It quite often happens that the egg is deposited inside of some part of the plant and the larva develops there, as in the case of the larva of the plumgouger. As the larva is inside of the plant (Fig. 95), it can- not be destroyed by any of the sprays, and, in such cases, effort is
. Elementary principles of agriculture; a text book for the common schools. Agriculture. 158 Elernentary Principles of Agriculture. ting off young plants near the ground. They are the caterpillar stage of several kinds of night-flying moths. (Fig. 98.) 230. How Insects Get Their Food, (a) By Living inside the Plant. It quite often happens that the egg is deposited inside of some part of the plant and the larva develops there, as in the case of the larva of the plumgouger. As the larva is inside of the plant (Fig. 95), it can- not be destroyed by any of the sprays, and, in such cases, effort is made to catch and destroy the adults before the eggs are laid. (b) By Feeding on the Leaves. Insects that feed directly on the leaves have mouth parts that are pro- vided with scissors-like jaws by which their food is cut from the plant. To destroy insects that feed in this way, it is sufficient to cover the leaves with some suitable arsenic compound by sprays. When they eat the leaves, they consume enough of the poison to induce their death. Paris green, London purple, and white arsenic are the most usual poisons. Grasshoppers, locusts, and army worms are killed in this way. In some portions of Texas they have the leaf-cutting ants, which attack peach trees in great numbers and cut and carry off nearly all the leaves. These ants do not eat the leaves, but carry them into their underground nests and use Fig. 98. Cutworm and moth. After Howard. Bureau of Entomology, United States, Department of Agri- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ferguson, A. M. (Alexander McGowen), 1874-; Lewis, Lowery Laymon, 1869- joint author. Sherman, Tex. , Ferguson Publishing Company
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