. Eastern forest insects. Forest insects. or on closely related ones. The upper surfaces of infested leaves may be either whitened, or brownish, or dead in appear- ance. The undersurfaces are speckled with eggs, excrement, and cast skins of the developing nymphs. The leaves of heavily in- fested trees may turn entirely brown and fall off. The winter is spent as adults (under bark scales or other cover on the host tree), or as eggs (cemented to the undersurfaces of leaves or embedded in leaf tissues). Most species have two generations a year. The sycamore lace bug, Corythucha ciliata (Say), occ
. Eastern forest insects. Forest insects. or on closely related ones. The upper surfaces of infested leaves may be either whitened, or brownish, or dead in appear- ance. The undersurfaces are speckled with eggs, excrement, and cast skins of the developing nymphs. The leaves of heavily in- fested trees may turn entirely brown and fall off. The winter is spent as adults (under bark scales or other cover on the host tree), or as eggs (cemented to the undersurfaces of leaves or embedded in leaf tissues). Most species have two generations a year. The sycamore lace bug, Corythucha ciliata (Say), occurs throughout the Eastern United States (725) and in southern Can- ada. Its preferred host is sycamore, but it also feeds on ash, hickory, and mulberry occasionally. The adult (fig. 12) is white and about 3 mm. long. Overwintering adults emerge early in the spring and deposit their eggs along the ventral surface of the midrib of a leaf, Hatching occurs in 2 to 3 weeks, and the nymphs feed for 5 or 6 weeks. There are two generations per year in the North, probably more in the South. Light feeding causes a stip- pling of foliage. Heavily infested leaves of sycamore turn white and drop prematurely. During dry weather this may result in severe injury. COURTESY CONN. AGR. EXPT. STA. Figure 12.—Adults of the syca- more lace bug, Corythucha The oak lace bug, Corythucha arcuata (Say), feeds on white, bur, and chestnut oaks from Alabama and the Carolinas to southern Canada. Connell and Beacher (156) discussed its life history and control. The winter is spent in either the egg or adult stage. Infested leaves appear grayish-white. Heavily infested trees may be defoliated, especially during dry weather. Bur oak in shelterbelt plantings is especially susceptible. The elm lace bug, Corythucha ulmi 0. & D. feeds on American elm in many Eastern States and southern Canada, and on Si- berian elm on the Northern Great Plains. It is capable of defoli- ating its host. Heavy infesta
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
