. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. 33^ ECONOMIC ENTOMOLOGY Eggs.—Minute, white, deposited in cavity of kernel. Larva.—Small, robust, whitish, legless; one larva to a kernel of wheat, but several in corn. Pupa.—White, clear and transparent. Control.—Superheat for 6 hours at i2o°-i2 5°F.; fumigate with hydrocyanic acid gas or carbon bisulphide. The Rice Weevil (Calandra oryzce) is also of economic importance, espe- cially in the South (Fig. 218). Com Bill-bugs (Sphenophorus spp.). —Adults. Snout-beetles, dull black, surfa
. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. 33^ ECONOMIC ENTOMOLOGY Eggs.—Minute, white, deposited in cavity of kernel. Larva.—Small, robust, whitish, legless; one larva to a kernel of wheat, but several in corn. Pupa.—White, clear and transparent. Control.—Superheat for 6 hours at i2o°-i2 5°F.; fumigate with hydrocyanic acid gas or carbon bisulphide. The Rice Weevil (Calandra oryzce) is also of economic importance, espe- cially in the South (Fig. 218). Com Bill-bugs (Sphenophorus spp.). —Adults. Snout-beetles, dull black, surface marked with small pits and narrow grooves; irregularly oval and rounded; 3^^-J^ inch long; hibernate under rubbish; single brooded (Fig. 219). Eggs.—^Laid in May and June in roots and stems of grasses. Larva.—Thick-bodied, oval, footless grub, with a hard brown head; feeding in corn stem or in root bulbs of grasses; June-August. S. maidis.—Does injury to corn Fig. 219.—The maize bill-bug both as grub and adult. The grub {Sphenophorus maidis). Pour times burrows in lower part of stalk, and the enlarged. ^ ' adult occupies the burrow. Other species make holes and slits in the leaves of corn. SCOLYTID^ OR IPID^ (BARK-BEETLES) Three common Fruit Bark-beetles are Eccoptogaster rugulosus, PhthoropUoeus liminaris and Anisandrus pyri, which may be dis- tinguished by the following characters: A. Venter of abdomen with caudal part bent abruptly upward. Antennal club flat and marked by angulated sutures.—Eccop- togaster rugulosus (Fruit-tree Bark-beetle). AA. Venter of abdomen normal, regularly curved. B. Antennal club lamellate, of three separate, laterally pro- duced segments; head visible from above.—PhthoropUoeus liminaris (Peach-tree Bark-beetle).. 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 origina
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
