. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. SOME INSECTS INJURIOUS TO FORESTS. Bureau of Entomology unci the Forest Service in the investigation of insect enemies of the black locust was proposed and adopted, b}' which the subject is receiving special attention from the viewpoint of both the forester and the entomologist, with the primary object of practical results. CHARACTER, OF THE INSECT AND ITS WORK. The locust ])orer is a whitish, elongate, so-called'' round-headed " grub or larva (tig. 1), which hatches from an ego; (tig. 2) deposited by a blac
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. SOME INSECTS INJURIOUS TO FORESTS. Bureau of Entomology unci the Forest Service in the investigation of insect enemies of the black locust was proposed and adopted, b}' which the subject is receiving special attention from the viewpoint of both the forester and the entomologist, with the primary object of practical results. CHARACTER, OF THE INSECT AND ITS WORK. The locust ])orer is a whitish, elongate, so-called'' round-headed " grub or larva (tig. 1), which hatches from an ego; (tig. 2) deposited by a black or brown and mellow striped long-horned winged l)eetle (fig. 3) found on the trees and on the liowers of golden-rod from August to October. The eggs are deposited in the crevices of the bark of living, growing- trees from August to O c t o b e r, and the young borers (fig. 2, /-*, r) hatching there- from mine into the outer portion of the living inner l)ark (tig. 5), where they pass the winter, and in the spring bore through the bark into the sap- wood and heartwood. Here thev transform in July and August to pupie (fig. 4) and in August and Septem- ber to adult beetles, which soon emerge from the trees and de- posit eggs for the next annual generation of borers and beetles. The injury to the trees (PL 1) consists of Avounds in the bark and .siipwood wiiich. if sufficiently severe or repeated year after 3'ear, result in either a stunted worthless growth or the death of 3"oung and old trees, while the numerous worm holes in the wood reduce its commercial value or render it worthless. The pi-esence of the insect in injurious numbers is indicated (L) by the frequency of the adults on the golden-rod flowers and on the trees, from August to October; (2) by the slight flow of sap and by the brownish borings where the young larvie are at work in the bark, during April and ]\Iay; (3) by the whitish sawdust ])orings lodged in. Fig. 1.—The locust borer ( robinur): a, lar
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