. 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. Fig. 223.—Clover root borer (Hy- lastinus obscurus). Natural size at right. {After Webster, U. S. Bur. Ent.) Fig. 224.—Larva or grub of the clover root borer. En- larged. {After Webster.) Larvce.—Feed on fungus growing on walls of tunnel; mature late in season. Pupa.—Formed in tunnels and adults emerge through entrance hole cut by mother beetle. Clover Root Borer {Hylastinus obscurus Marsh). —Adult. A small dark brown
. 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. Fig. 223.—Clover root borer (Hy- lastinus obscurus). Natural size at right. {After Webster, U. S. Bur. Ent.) Fig. 224.—Larva or grub of the clover root borer. En- larged. {After Webster.) Larvce.—Feed on fungus growing on walls of tunnel; mature late in season. Pupa.—Formed in tunnels and adults emerge through entrance hole cut by mother beetle. Clover Root Borer {Hylastinus obscurus Marsh). —Adult. A small dark brown cylindrical hairy scoly- tidid beetle, 3^fo ii^ch long; wing-co vers coarsely punctate (Fig. 223). Eggs.—Minute, white, elliptical and shining. Larva.—A white stout footless grub with yellow head and brown mouth-parts; % inch long (Fig. 224). Pupa.—White, with a pair of spines at top of head, and another at tip of abdomen (Fig. 225). Life-history.—-There is but one brood each year. The adult winters in the clover roots, and lays her eggs during May and June in the crown or on the sides of the root. The larvae tunnel the root, and mature in July; the pupae transform to adults be- fore October ist. Control.—Flow up infested clover fields after the hay is taken off; break up clover sod after taking one crop. Forest Bark-beetles {Dentroctonus spp. chiefly).—(Consult bulletins. Fig. 225.— Pupa of the clover root borer. Enlarged. {After Webster.). 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 original Lochhead, William, 1864-. Philadelphia, Blakiston
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
