. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 339 BB. Antennal club globular; truncate at tip, head deeply im- bedded in prothorax whose anterior margin is nearly horizontal and invisible from above.—Anisandrus pyri (Shot-hole Borer). (Consult Farmers' Bull. 763.) Fruit Tree Bark-beetle {Eccoptogaster rugulosus Ratz.).—Intro- duced from Europe; occurs in most states east of the Rockies. This small beetle, also calle
. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 339 BB. Antennal club globular; truncate at tip, head deeply im- bedded in prothorax whose anterior margin is nearly horizontal and invisible from above.—Anisandrus pyri (Shot-hole Borer). (Consult Farmers' Bull. 763.) Fruit Tree Bark-beetle {Eccoptogaster rugulosus Ratz.).—Intro- duced from Europe; occurs in most states east of the Rockies. This small beetle, also called the Shot-hole Borer, injures fruit trees by puncturing the bark, and burrowing in the bark and wood, causing the death of twigs and leaf buds (Fig. 220). Adidt.—A small black scolytid beetle j^f 0 i^^ch long, with the tips of wing-covers and parts of the leg reddish. May-June and a be Fig. 220.—The fruit tree bark beetle (Eccoptogaster rugulosus): a, adult or beetle; b, same in profile; c, pupa; d, larva. All enlarged about 10 times. (Chittenden.) Eggs.—Deposited in little pockets in the brood gallery or chamber between the bark and sapwood; hatch in 3 to 4 days (Fig. 221). Larva.—Matures in 4 to 5 weeks. A minute legless grub \{o inch long; whitish; head small, larger in front than behind. Larval burrows 3 or 4 inches long, filled with reddish dust-like fras and at first at right angles to brood chamber. Pupa.—Pupa formed in a slightly enlarged chamber; duration 7 to 10 days. Adults make their way out through little round holes in the bark. Life-history.—Cycle in about 1^-2 months; two generations in a season in the North and more in the South. Second brood larvae winter in the trees. Said to attack preferably unhealthy trees. Parasitized by Ckiropachys colon Westw., a chalcid. Control.—Remove and destroy dead or dying trees before May or June; apply a protective wash of whitewash and carbolic acid in June and Please note that these images
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
