. Elementary principles of agriculture : a text book for the common schools. Agriculture. Insects on the Farm 159 insects do not find acceptable food-plants they die. Many insects are exclusively flesh-eating, such as the common "doodle-bugs," wasps, lady-bugs, and man^ species of wood ants. Mosquitos are a common form of blood-sucking insects. Many parasites are solely responsible for the spread of diseases. The ticks on cattle, which are somewhat related to true insects, are carriers of disease. Cattle do not have the splenic fever (sometimes called Texas fever) except when the ger
. Elementary principles of agriculture : a text book for the common schools. Agriculture. Insects on the Farm 159 insects do not find acceptable food-plants they die. Many insects are exclusively flesh-eating, such as the common "doodle-bugs," wasps, lady-bugs, and man^ species of wood ants. Mosquitos are a common form of blood-sucking insects. Many parasites are solely responsible for the spread of diseases. The ticks on cattle, which are somewhat related to true insects, are carriers of disease. Cattle do not have the splenic fever (sometimes called Texas fever) except when the germs are carried by ticks that bite them. The common bee lives on the nectar and pollen of flowers. It is not the only insect that lives on nectar. Most species of butterflies, moths, bum- blebees, etc., are nectar- loving insects. We have already learned that these insects are very useful in bringing about the pollina- tion of flowers. 229. The Feeding Habits of Different Stages. The depredations upon plants and animals are made in various ways. Often the immature stages are more destructive than the adult. Most frequently it is the larval stage (caterpillar, grub, maggot) that depredate upon the plants. The Colorado potato-bug lays its eggs on the leaves. The young larvae are hatched out, therefore, right at the breakfast table. In the caterpillar stage, some species of insects occur in great numbers, and they are, hence, often spoken of as. Fig. 97. Corn ear-worm or cotton boll-worm. After Quaintance, Bureau of Entomology, United States Department of Agricul- 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-. Chicago, Ill. : Ferguson Publishing Company
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