. Eastern forest insects. Forest insects. The pecan nut casebearer, Acrobasis caryae Grote, occurs from southern Canada to Florida and westward to Illinois and Texas. Its preferred host appears to be pecan, but it also feeds on hick- ories. The adult is dark gray, with a ridge or tuft of long dark scales extending across each forewing, and has a wingspread of 18 to 20 mm. Mature larvae are a dirty, olive green and are about 12 mm. long. Winter is spent in the larval stage in a small case near the base of a bud. Later, they bore into tender shoots, caus- ing them ^p become stunted and distorted
. Eastern forest insects. Forest insects. The pecan nut casebearer, Acrobasis caryae Grote, occurs from southern Canada to Florida and westward to Illinois and Texas. Its preferred host appears to be pecan, but it also feeds on hick- ories. The adult is dark gray, with a ridge or tuft of long dark scales extending across each forewing, and has a wingspread of 18 to 20 mm. Mature larvae are a dirty, olive green and are about 12 mm. long. Winter is spent in the larval stage in a small case near the base of a bud. Later, they bore into tender shoots, caus- ing them ^p become stunted and distorted. Larvae of the second generation appear in May and bore into newly-set nuts, destroy- ing from two to five nuts each. Larvae of later generations usu- ally feed on the shucks only and cause little or no damage. There are three or four generations per year in the South. Several other species of Acrobasis also occur on forest and shade trees in eastern United States. The birch tube maker, A. bet- ulella Hulst is common on various species of birch, white birch in particular (in the Northern States and southern Canada) ; A. ru- brifasciella Pack.—on alder; A. indiginella (Zeller)—on hawthorn (in the Northeast) ; A. clemotella Grote and A. septentrionella Dyar—on pecan buds (in Texas) ; and A. feltella Dyar—on hick- ory (in southern Canada and from New England to Illinois). The genus Dioryctria Zeller has a world-wide distribution in the Northern Hemisphere, and the larvae of all species are borers in conifers. Many are highly injurious to seeds and cones. The larval habits of some of the more widely distributed species are quite variable. This suggests that more than one species is in- volved in certain cases. This can be established only through further taxanomic and biological investigations. The genus has been discussed by Ebel (217), Heinrich (336), Neunzig and Mer- kel (565), Munroe (551), and Neunzig, et al. (566). Dioryctria clarioralis (Walker) occurs throughout th
Size: 1862px × 1342px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
