. Eastern forest insects. Forest insects. pair of long slender brownish filaments on each side of the second and third segments; a pair of small, rusty red tubercles on the eighth segment; and a broad stripe on the dorsum from the pro- thorax to the first pair of filaments. Larvae are active from May to July; adults, from late June to August. The elm spanworm, Ennomos subsignarius (Hbn.) (fig. 131), occurs occasionally in southern Ontario and throughout eastern United States, west to Michigan, Colorado, and Texas. Its pre- ferred hosts are recorded as hickory, oak, and ash, but it also attacks
. Eastern forest insects. Forest insects. pair of long slender brownish filaments on each side of the second and third segments; a pair of small, rusty red tubercles on the eighth segment; and a broad stripe on the dorsum from the pro- thorax to the first pair of filaments. Larvae are active from May to July; adults, from late June to August. The elm spanworm, Ennomos subsignarius (Hbn.) (fig. 131), occurs occasionally in southern Ontario and throughout eastern United States, west to Michigan, Colorado, and Texas. Its pre- ferred hosts are recorded as hickory, oak, and ash, but it also attacks a large number of other hardwoods (HO). About 100 years ago, it was best known as a shade tree pest in the larger cities of eastern United States {3^3). In recent years it has been predominantly a forest pest, with widespread severe outbreaks occurring in the southern Appalachians (238). The adult is a powdery white moth with a wingspread of 30 to 37 mm. Full-grown larvae are usually dull, slate black in color except for rusty head capsules; they are slightly more than 50 mm. long. Winter is spent in the egg stage. Hatching begins in late April in the South. Farther north, it may not start until late May or early June. Young larvae feed on the lower surfaces of leaves, producing shot-hole effects. Older ones eat the entire leaf with the exception of the midrib and petiole. To pupate, mature larvae spin coarse, net-like cocoons of silken threads, often on partly. F-500617, 500618, 500615, 500619 Figure 131.—Elm spanworm, Ermomos subsignarius: A, adults; B, eggs; C, larvae; D, pupae. 343. 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
