47 



Ix)j; of Hoii^^las Hprucr, sliowiii^r ;^ulli'rii'S of tlic l)<)ii;_'l:is s]irti(c nciiilructoim.s. 

 State of Waf'hiii^toii. 



Stoiiii-fi'lltMl J>oii^'las spnicc offciiii^' fa\(jral)le coiulition.s for tlin projuijiation of 

 tin- l)on<;la.s f^iinuc I>(iiilnt(t<iiiii,>< ami oilier l)ark-l)cetles. State of Wa,sliiiigtoii. 



Bark from titonii-fi'Ucd loj; of Douglas si iriu-e, phowing galleries of the Douglas 

 spruce Dendroctoiious. State of Wiu«hiiigtoii. 



(iroup of long-leufed jiine killed ])y so-called "worm deadening." Eastern Texas. 

 •Young Sitka spruce, showing top kille<l by western Hi)ruee-weevil. State* of 

 ^Va8hington. 



Cottonwood tree killed l)y the l)ronzed Agrilus, showing the galleries of larvio in 

 trunk. I'riest River Forest Reserve, Idaho. 



Young chestnut killeil by the two-lined clie.stnut borer. Western North Carolina. 



].arge chestnut, the death of which was hastened ])y insect injury. Western 

 North C'arolina. 



(iinlled cypress tree injured by tind)er l)eetles. South (.'an.ilina. 



Trunk of hickory killed by hickory bark-beetle, showing galleries on surface of 

 wood. Western North Carolina. 



