Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE IXSECT IVOKIJh 301 K- 339- The ' cotton-worm' is the larva of Aletia argillacea, about which many volumes have been written, and whose life history has been thoroughly investigated under the direction of the United States Entomological Commission and the entomologists of the United States Dei)artment of Agriculture. To one especially interested in this insect these elaborate reports will hr useful and
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE IXSECT IVOKIJh 301 K- 339- The ' cotton-worm' is the larva of Aletia argillacea, about which many volumes have been written, and whose life history has been thoroughly investigated under the direction of the United States Entomological Commission and the entomologists of the United States Dei)artment of Agriculture. To one especially interested in this insect these elaborate reports will hr useful and must be consulted. It will suffice here to say that the caterpillars pupate in a loose co- coon spun on the leaves of the plants, and from the dark-brown [)upa comes a dull, tawny or clay- colored moth, with intlistinct, dark, wavy, transverse lines, and a rather prominent leaden-white spot, more or less margined with t^lack, near the middle of the fore wings. There are several broods in the course of the year, but only the later ones be- come seriously injurious, the plant then being sometimes entirely de- foliated. A curious feature is that the insects probably do not spend the winter in our territory, but adults immigrate each year from more southern regions. The migrating habit is marked in the later broods maturing on cotton in our country, and the moths have been often seen in great numbers as far north as Canada. As the wings are closely scaled, they do not readily show the wear and tear of long flight, and specimens have been taken in the for north as fresh and bright as if hatched there. It is })Ossible that under favorable circumstances the caterpillars may support themselves on plants other than the cotton, but we have no positive information of their having done so. Of late years the insects are much less injurious than in times past, largely as the result of a diversified agriculture, which has made it less easy for them to increase in abnormal numbers. Planters ha
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