. Eastern forest insects . COURTESY CONN. AGR. EXPT. STA. Figure 193.—Petiole of maple leaf severed by larvae of the maple petiole borer, Caulocampus acericaulis. tree in a week. Shade trees are especially subject to serious de- foliation (U8). The black-headed ash sawfly, Tethida cordigera (Beauvois), oc- curs throughout much the same area as the brown-headed ash sawfly. The habits, food plants, and life histories of the two spe- cies are also very similar. Full-grown larvae are whitish with a yellowish tinge and are about 18 mm. long. The head is shiny black, and the thoracic legs are blacki
. Eastern forest insects . COURTESY CONN. AGR. EXPT. STA. Figure 193.—Petiole of maple leaf severed by larvae of the maple petiole borer, Caulocampus acericaulis. tree in a week. Shade trees are especially subject to serious de- foliation (U8). The black-headed ash sawfly, Tethida cordigera (Beauvois), oc- curs throughout much the same area as the brown-headed ash sawfly. The habits, food plants, and life histories of the two spe- cies are also very similar. Full-grown larvae are whitish with a yellowish tinge and are about 18 mm. long. The head is shiny black, and the thoracic legs are blackish-brown. This species is occasionally a pest of shade trees. Eriocampa juglandis (Fitch) (previously misidentified as Blennocampa caryae (Norton), the butternut woolly worm, occurs in southern Canada and throughout the Northeastern States. Its hosts are butternut, black walnut, and hickory. Full-grown larvae are green, with indistinct black spots on the sides and are about 18 mm. long. The body is covered with flocculent white tufts which rub off when touched, and the head is white with black eye spots. The larvae feed gregariously, often causing considerable defoliation locally. When they become full grown they move to and enter the ground, where they form cocoons composed of par- ticles of sand and earth cemented together. Winter is spent in the cocoons and there is one generation per year. The genus Hoplocampa Hartig is represented in eastern Amer- ica by a number of species, all of which presumably feed as lar- vae in the fruit of their hosts. Eggs are laid in the calyx of flowers and the larvae bore into and hollow out the developing fruit. Some of the eastern species and their known hosts are as follows: H. oskina Ross—hawthorn in the Central States, H. 464
Size: 2619px × 1908px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
