. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 498 ECONOMIC ZOOLOGY AND ENTOMOLOGY moth. The larvae spin little silken tubes which protect them while they are feeding in the flour or waste about the mill. When full grown they wander about in search of a suitable place to pupate, spinning a web wherever they go. It is this habit that renders them most injurious, for the infested flour and many parts of the mill become filled with the webs. This necessitates frequent and expensive stoppings of work in the infested mills. Great cleanliness about the mill is neces
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 498 ECONOMIC ZOOLOGY AND ENTOMOLOGY moth. The larvae spin little silken tubes which protect them while they are feeding in the flour or waste about the mill. When full grown they wander about in search of a suitable place to pupate, spinning a web wherever they go. It is this habit that renders them most injurious, for the infested flour and many parts of the mill become filled with the webs. This necessitates frequent and expensive stoppings of work in the infested mills. Great cleanliness about the mill is necessary. When the insect becomes troublesome the mill should be closed tightly and fumigated with hydrocyanic acid gas under the direction of some experienced person. If the temperature throughout the mill can be raised to about 120° F. and main- tained there for a day, all moths, pupae, larvae and eggs will be killed. COTTON The Boll-weevil (Anthonomus grand is).—There are several important enemies of the cotton plants, but during the last few years the boll-weevil has become so important as to over- shadow almost all the others. Indeed, one of these insects,. FIG. 235. Boll-weevil, Anthonomus grandis. (Much enlarged.) the cotton-worm, which was formerly looked upon as one of the worst enemies, is now regarded with some favor by many planters because it sometimes aids in controlling the weevil by stripping the late foliage from the plants and thus depriving the weevil of its food. This small, brownish snout beetle is commonly known as the Mexican cotton boll-weevil because, like several other insect pests of the south, it came into the United States from 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and c
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