. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 9.—The sugar-beet webworm (Loxostege sticticalis) : Moth. Twice natural size. (Reengraved after Insect Life.) GENERAL APPEARANCE OF THE SUGAR-BEET WEBWORM AND NATURE OF ATTACK. The parent of this webworm (fig. 9) belongs to the lepidopterous family Pyralida?, and is a tawny-brown, active moth, or ** miller.** with a wing expanse of about 1 inch. It is larger and more conspicuously colored than the garden web- worm which is shown in figure 10. The moths deposit their pearly-white eggs singly or in rows of fro
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 9.—The sugar-beet webworm (Loxostege sticticalis) : Moth. Twice natural size. (Reengraved after Insect Life.) GENERAL APPEARANCE OF THE SUGAR-BEET WEBWORM AND NATURE OF ATTACK. The parent of this webworm (fig. 9) belongs to the lepidopterous family Pyralida?, and is a tawny-brown, active moth, or ** miller.** with a wing expanse of about 1 inch. It is larger and more conspicuously colored than the garden web- worm which is shown in figure 10. The moths deposit their pearly-white eggs singly or in rows of from two to five or more, usually on the under side of the leaf. TYlien deposited in rows they overlap more or less. Each female moth is capable, under normal condi- tions, of depositing at least 200 eggs. From these eggs hatch the small larvae, or "; When first hatched the "worms'* are whitish, with black heads, but as they feed and increase in size they become green, with dark markings. The very young larvae eat small holes in the under side of the leaves without, however, cutting through the upper epidermis, but as they increase in size they consume almost the entire leaf, with the excep- tion of the larger veins and the petioles. The "worms " prefer the older leaves, and unless the food supply is nearly exhausted do not eat the voiing leaves at the center of the plant. "When full grown the " worms,"; which are slender and about an inch in length, leave the beets and burrow in the soil, usually close about the infested plants, and spin tubelike cases in which they later pupate. The pupa? are slender, yellow-brown, inactive ob- ject^, from which during the summer months the moths issue within a few days. The moths, after issuing, feed on the nectar in alfalfa or other blossoms and within a few days mate and are ready to commence depositing eggs for another generation or brood of " ;. c Fig. 10.—The garden webworm
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology
