Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . species of these crane flies in America, and thelater stages of one of the largest of them are repre-sented in the accompanying figure. Remedies.—In America these insects rarely be-come sufficiently injurious to require remedial treat-ment. When they do the most successful plan yettried is that of driving a flock of sheep or herdof swine over the field to kill the larvae by theirtramping. INJURING THE LEAVES. The Army Worm. Leucania unipuncta. This is one of the most noted insec
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Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . species of these crane flies in America, and thelater stages of one of the largest of them are repre-sented in the accompanying figure. Remedies.—In America these insects rarely be-come sufficiently injurious to require remedial treat-ment. When they do the most successful plan yettried is that of driving a flock of sheep or herdof swine over the field to kill the larvae by theirtramping. INJURING THE LEAVES. The Army Worm. Leucania unipuncta. This is one of the most noted insect enemies ofAmerican agriculture. It occasionally does greatdamage to a variety of cereal and forage crops, although during recent years its irruptions appear tobe growing less frequent. The worm itself is closelyrelated to the cut-worms, to which it is similar inlife-history and habits. It hatches from eggs laid by 246 INSECTS AFFECTING GRASS.. a handsome brown moth (Fig. 133, a) between thesheaths of grassblades. The younglarvae hatch in a weekor ten days, and areat first green, butlater become orna-mented with longitu-dinal stripes of yel-low, gray, and black, (6). The larva feedsupon the leaves ofgrass, wheat, oats, rye, etc., and becomes full grown in about a Fig. 133. Army Worm : a, moth ; 6, larva. month from the time of hatching. Ordinarily itremains concealed about the bases of grass or grain, feeding there unnoticed, but occasionally the larvsebecome so numerous that they exhaust their foodsupplies, and then they are forced to seek other feed-ing grounds. At such times the armies appear, and moving in solid masses sweep all grasses andcereals before them. The full-grown larvse enter theground and pupate in earthen cells, emerging a fort-night later as moths. Tn southern latitudes thereare two or three broods each season, while at theNorth there are one or two. The insect hibernatesboth as a moth and larva, although the