. A manual for the study of insects. Insects. LEPIDOPTERA. 301. Fig. 360.—Plusia sivtplex. number of individuals m the later broods which infest the cotton. The genus Plusia (Plu^si-a) includes a large number of species in which the fore wings are marked with metallic-colored scales. The most common form of this marking is a silvery spot shaped something like a comma near the centre of the wing. Plusia simplex (Fig. 360) is a well-known illustra- tion of this genus. About sixty species of this genus have been described from North America. In some of the species the metallic markings cover a la
. A manual for the study of insects. Insects. LEPIDOPTERA. 301. Fig. 360.—Plusia sivtplex. number of individuals m the later broods which infest the cotton. The genus Plusia (Plu^si-a) includes a large number of species in which the fore wings are marked with metallic-colored scales. The most common form of this marking is a silvery spot shaped something like a comma near the centre of the wing. Plusia simplex (Fig. 360) is a well-known illustra- tion of this genus. About sixty species of this genus have been described from North America. In some of the species the metallic markings cover a large proportion of the fore wings, and in others they are wanting. The larva of Plusia brassicce (P. bras^si-cae) feeds on cabbage and other Cruciferce, In the cotton-growing States the most important insect pest is the Cotton-worm, Aletia argillacea (A-le^ti-a ar-gil-la'- ce-a). The adult of this insect (Fig. 361) is a brownish moth with its fore wings crossed with wavy lines of darker color and marked with a bluish discal spot and two white dots as shown in the figure. This moth is found in the Northern States and even in Canada in the latter part of the summer and in the autumn. But this occurrence in the North is due to migrations from the South, as the insect can- not survive the winter north of the Gulf States. The larva feeds on the foliage of cotton; and as there are five or six generations in a year, the multiplication of individuals is very rapid, and the injury to the cotton great. Detailed descriptions and colored figures of this insect in its different stages are given in the works cited above in the description of the Boll-worm. The best known way of combating this pest IS by the use of Paris 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 Comstock, John Henry, 1849-1931; Comstock, Ann
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
