Insect pests of farm, garden and orchard . -spread eastward toOhio, though not in-jurious south of theOhio River. Though the lifehistory of the insecthas not been entirelydetermined, the fol-lowing summarizesit as observed byProfessors S. A, Forbes and F. M. Webster in Illinois and Indiana. The eggsare laid in the early fall, within a few inches of the base of the stalk,and just beneath the surface of the soil. The egg is a dirty whitecolor, oval in shape, and about one-fiftieth inch long. The winter ispassed in the egg stage, differing from most nearly related beetles inthis, and the eggs hat
Insect pests of farm, garden and orchard . -spread eastward toOhio, though not in-jurious south of theOhio River. Though the lifehistory of the insecthas not been entirelydetermined, the fol-lowing summarizesit as observed byProfessors S. A, Forbes and F. M. Webster in Illinois and Indiana. The eggsare laid in the early fall, within a few inches of the base of the stalk,and just beneath the surface of the soil. The egg is a dirty whitecolor, oval in shape, and about one-fiftieth inch long. The winter ispassed in the egg stage, differing from most nearly related beetles inthis, and the eggs hatch in the spring or early summer. At firstthe larvse eat the small roots entire, but later burrow under theouter layers of the larger roots, causing the stalks on rich loam to * Diabrotica longicornis Say. Family Chrysomelidee. 157. Fig. 117.—The western corn root-worm: a,beetle; b, larva; c, enlarged leg of same; d,pupa—all enlarged. (After Chittenden, U. Agr.) 158 INSECT PESTS OF FARM, GARDEN AND ORCHARD be easily blown over, or dwarfing the plant on poorer land so thatit produces but small ears. The full-grown larva is nearly whitewith a brown head, a little less than one-tenth inch long by aboutone-tenth inch in diameter. Three pairs of short legs are foundon the thorax, but otherwise the body appears perfectly smoothto the eye, though finely wrinkled. Before pupation the color])ecomes slightly darker and the body shortens. Leaving theroots, the larvae then form small oval cells in the soil and in themtransform to pupa% from which the adult beetles emerge in ashort time. The beetles appear from the middle of July onthrough August, about two mor ths being required for developmentafter hatching from the egg. The beetles are of a greenish orgreenish-yellow color, about one-quarter inch long, and resembl
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