. Eastern forest insects. Forest insects. COURTESY CONN. AGR. EXPT. STA. Figure 191.—Larvae of Trichiocampus viminalis on leaves of poplar. Older ones tend to scatter and eat all but the midribs and larger veins. They become full grown in June or early July. Some pu- pate and give rise to a second generation of adults in August; the remainder do not complete their development until the follow- ing spring. Carolina and Lombardy poplars grown for ornamental purposes may be seriously defoliated. The dusky birch sawfly, Croesus latitarsus Norton, occurs in eastern Canada and south through the East
. Eastern forest insects. Forest insects. COURTESY CONN. AGR. EXPT. STA. Figure 191.—Larvae of Trichiocampus viminalis on leaves of poplar. Older ones tend to scatter and eat all but the midribs and larger veins. They become full grown in June or early July. Some pu- pate and give rise to a second generation of adults in August; the remainder do not complete their development until the follow- ing spring. Carolina and Lombardy poplars grown for ornamental purposes may be seriously defoliated. The dusky birch sawfly, Croesus latitarsus Norton, occurs in eastern Canada and south through the Eastern States to Florida. Its hosts are various species of birch, preferably gray birch. It has also been found feeding on alder and cherry in Canada. Full- grown larvae are yellowish-green with shades of black and are about 24 mm. long. There is a row of more or less distinct black blotches on each side and a series of black spots in the subspirac- ular area. Winter is spent in the prepupal stage in a cocoon in the topsoil. Adults appear during May and June, or earlier in the Deep South. There may be several overlapping generations per year and lar- vae may be found from spring until fall. The larvae are gre- garious and feed along the edges of the leaf (fig. 192). Colonies are often found defoliating small saplings, but this usually does not occur over wide COURTESY CONN. AGR. EXPT. STA. Figure 192.—Larvae of the dusky birch sawfly, Croe- sus latitarsus. 462. 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 Baker, Whiteford L. (Whiteford Lee), 1903-. Washington : U. S. Dept. of Agriculture, Forest Service ; for sale by the Supt. of Docs. , U. S. G. P. O
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
