File:Applied entomology; an introductory text-book of insects in thier relations to man (1921) (19746849895).jpg

Title: Applied entomology; an introductory text-book of insects in thier relations to man
Identifier: appliedentomolo00fern (find matches)
Year: 1921 (1920s)
Authors: Fernald, Henry Torsey, 1866-; Metcalf Collection (North Carolina State University). NCRS
Subjects: Insect pests; Insects
Publisher: New York (etc. ) McGraw-Hill
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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Fig. 283.—Dingy Cutworm (Feltia subgothica Haw.): a, moth, wings spread; b, larva (Cutworm); c, Moth, wings folded. All somewhat enlarged. (From U. S. D. A. Farm. Bull. 8.56.) from 50 to several hundred in number, are laid preferably on grass blades and in the South hatch in a few days. The caterpillars feed 2 or 3 weeks before reaching full size and are then very similar to those of the Army Worm. They then pupate for 10 to 14 days in the ground, after which the adult moths emerge. Many of these moths now fly northward, often several hundred miles, before laying their eggs, and in this new location another generation is produced, the adults of this generation also flying northward to lay their eggs. In this way the northern part of the country becomes infested in the fall but frost puts an end to the development of these insects near their northern limits before more than one generation can be produced. Going southward, more are possible, and in the Gulf States there may be six in the course of a season. Where corn and cotton are grown the destruction caused by this insect is often very great, the caterpillars as they get large having voracious appetites. They usually feed more at night than during the daytime, and like the Army Worm, march to other places to find food when the supply where they are becomes exhausted. In general the methods used for controlling the Army Worm apply to this insect also. A number of other species of Noctuids have the habit of marching in armies when their food be- comes scarce. Their life histories and habits are for the most part quite similar to those of the two species already described, and con- trol methods for them are generally the same. Still another section of this family occurs, widely distributed, and causing much injury. The insects of this division are called Cutworms (Figs. 283 and 284) because of the habit of the larvae of feeding on the
Text Appearing After Image:
Fig. 284.—Cotton-boll Cutworm (Prodenia ornitho- galli Guen.): a, light form of Cutworm; b, dark form; dark form of Moth above; pale form below. All some- what enlarged. (From U. S. D. A. Farm. Bull. 890.)

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