. Insect pests of farm, garden and orchard . ProfessorJ. H. Comstock.§ The adult beetle is a rather slender insect, about one-quartei * Schizocerus privatus Norton. t Cylas formicurius Oliv. Family Curculionidoe. t Bulletin 28, La. Agr. Exp. Sta., p. 999. S See Report U. S. Comm. Agr., for 1879, p. 249. INSECTS INJURIOUS TO THE SWEET POTATO 439 inch long, of a bluish-black color, with a reildish-bruwn prothorax,and has received its specific name, forniicariua, from its fanciedresemblance to an ant. Life History.—The yellowish-white, oval eggs are depositedin small cavities eaten out by the mot
. Insect pests of farm, garden and orchard . ProfessorJ. H. Comstock.§ The adult beetle is a rather slender insect, about one-quartei * Schizocerus privatus Norton. t Cylas formicurius Oliv. Family Curculionidoe. t Bulletin 28, La. Agr. Exp. Sta., p. 999. S See Report U. S. Comm. Agr., for 1879, p. 249. INSECTS INJURIOUS TO THE SWEET POTATO 439 inch long, of a bluish-black color, with a reildish-bruwn prothorax,and has received its specific name, forniicariua, from its fanciedresemblance to an ant. Life History.—The yellowish-white, oval eggs are depositedin small cavities eaten out by the mother beetle either at thebase of the vine or at the stem end of the tuberous root, or inthe tubers in storage. The small grubs commence to burrowin the vine, sometimes maturing in the vine l^efore any tubershave developed, but usually they descend to the tubers, w^hich. Fig. 314.—The sweet-potato root-borer (Cylas formicarius): extreme lefthand figure, adult beetle, with enlarged antennae at right; figure atleft center, pupa; at right center, larva; at extreme right, portion ofsweet-potato tuber channeled by borer—all figures except the last con-siderably enlarged; natui-al sizes indicated by hair lines. (After Far-mers Bulletin, No. 26, U. S. Dept. Agr.) in the course of the season, and with the aid of the beetles, theythoroughly riddle. The full-grown larva is aljout one-quarterinch long, whitish with light brown head, the segments are stronglyconstricted, and the legs are wanting, l^eing represented by meretubercles. The grub forms a small cavity at the end of thel)urrow and transforms to the pupa. In this stage it remains fromone to two weeks, when the adult beetle emerges and after a fewdays commences to lay eggs for another generation. The whole 440 INSECT PESTS OF FARM, GARDEN AND ORCHARD life cycle requires from thirty to forty chiys, .so
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