10 MISC. PUBLICATION 7 4, U. S. DEPT. OF AGRICULTURE 



THE ZIMMERMAN PINE MOTH 



Pinipestis zimmermani Grote 



The Zimmerman pine moth is a serious insect pest of pine, attack- 

 ing western yellow pine, white pines, Scotch pine, and Austrian 

 pine. The caterpillar bores into the bark of the trunk, usually 

 avoiding the base and top, and causes the malformation known as 

 spike top or sometimes kills the entire tree. The injury it produces 

 also brings about a considerable depreciation in the value of the 

 timber. The species is especially abundant in the northern and west- 

 ern part of the United States (6). 



THE CARPENTER WORM 



Prionoxystus robiniae Peck 



The larvae of this large moth bore in a great variety of eastern 

 hardwoods, especially oak and locust, causing large wormholes and 

 resulting defects in the lumber (44, 48). 



THE DOUGLAS FIR PITCH MOTH 



Synanthedon novaroensis Hy. Edw. 



The Douglas fir pitch moth is an important enemy of Douglas fir 

 over the northern Kocky Mountain and Pacific coast regions. The 

 insect causes pitch seams, gum check, and other defects which seri- 

 ously depreciate the value of the timber. Its attack appears to bo 

 restricted to that portion of the trunk which later clears itself of 

 branches (5). 



THE .SEQUOIA PITCH MOTH 



Vespamima sequoiae Hy. Edw. 



The Sequoia pitch moth attacks almost all conifers of the North- 

 west. It is particularly abundant and destructive to lodgepole pine 

 in certain regions of Montana. The insect infests the extreme base 

 of the trees, causing a heavy pitch flow over the base of the trunk 

 and surrounding ground. The trees attacked are frequently killed 

 and jeopardize other trees in the neighborhood through increased 

 fire hazard (4). 



THE LEOPARD MOTH 



Zeuzera pyrinu Fab. 



The leopard moth kills the limbs of hardwood trees and is locally 

 serious in the New England and the Northeastern States. The 

 species was introduced from Europe and is spreading slowly to the 

 South and West (45). 



THE CAMBIUM MINERS 



Agromyza aceris Greene 

 Agromyza amelanchieris Greene 



Birch, cherry, maple, oak, poplar, and many other less commonly 

 used hardwood trees have small, yellowish-brown spots or streaks 

 called " pith flecks " made by the larvae of several species of flies, 

 the names of two species being given above. In the Eastern States 

 this injury sometimes lowers the grade of the product for certain uses 



