Bulletin . Rht form of full-Krowalarva ; 6. dark form of same ; c. pupa; d. spotted form of moth—all -slightly en-larged. (After Howard, U. S. Dept. Agr.) fence corner, under the eaves or in the cracks of a building, orsometimes just under the surface of loose soil, and there spinsits cocoon. Very frequently the old cocoon of some other mothis utilized or practically no cocoon is made. The cocoon is aflimsy affair at best, merely a thin covering of silk with whichthe caterpillar mingles some of its hairs as it spins the it the caterpillar sheds its skin for the last time, having
Bulletin . Rht form of full-Krowalarva ; 6. dark form of same ; c. pupa; d. spotted form of moth—all -slightly en-larged. (After Howard, U. S. Dept. Agr.) fence corner, under the eaves or in the cracks of a building, orsometimes just under the surface of loose soil, and there spinsits cocoon. Very frequently the old cocoon of some other mothis utilized or practically no cocoon is made. The cocoon is aflimsy affair at best, merely a thin covering of silk with whichthe caterpillar mingles some of its hairs as it spins the it the caterpillar sheds its skin for the last time, having July, 1908.] CATERPILLARS INJURING FOLIAGE. 211 already molted four or five times during growth, and the castskin is tucked away at one end of the cocoon. With this moltthe caterpillar has transformed to the pupa, similar to thechrysalis of butterflies. In 1905 the caterpillars pupated aboutSeptember 7. In the pupa stage the insect remains dormantthroughout the winter, the moths emerging from the pupa? in. Fig. 4. The Fall Webworm. Moth and cocoons, natural size. June, as already described, June 9 and 10 being the exact datesat Durham in 1906. Further south there are two broods in a season, but in NewHampshire but one seems to occur. REMEDIES. Spraying.—^When the caterpillars are first noticed at work onthe tips of the twigs, if they seem to be abundant, it is best tospray the tree with an arsenical. Arsenate of lead, five poundsto the barrel of water, is best, though Paris green, at the rate of 212 N. H. AGR. EXPERIMENT STATION. [Bulletin 139 one pound to 100 irallons, with a pound or two of freshly slackedstone lime is equally effective, but does not adhere as well. It isuseless to wait until the tree is covered with large Avebs and thenspray. To be effective the tree must be sprayed early in Augustsoon after the eggs hatch. As it is also advisable to spray at thistime for the young bro\\Ti-tail moth caterpillars, it will be foundto be good practice to spray about this ti
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