Jack Pine Sawfly
Neodiprion pratti banksianae |
| USDA Forest Service. 1979. A guide to common insects and diseases of forest trees in the northeastern United States. Northeast. Area State Priv. For., For. Insect and Disease Management., Broomall, PA. p. 123, illus. |
The jack pine sawfly occurs in natural stands and plantations of jack pine in the Lake States and southern Canada. Jack pine is the primary host, but red and Scots pines may also be attacked. The larvae attack old foliage on trees of all sizes, giving the trees a tufted appearance by leaving only current-season foliage at the branch tips. Defoliation results in growth reduction and some branch mortality.
The overwintering eggs, deposited in the needles, hatch in late April or early May. The larvae feed in colonies until late June or early July. The full-grown larva is yellow-green with three greenish-gray stripes (sometimes two solid stripes and one broken strips) along the back and side of the body. The head is black. Pupation occurs in late summer, and adults lay eggs in early fall. There is one generation per year.
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