WHITE PINE WEEVIL 



277 



is a hard thing for a tree owner to do, but quite necessary in order 

 to protect other trees. He suggests the need of some other remedial 

 measure, and reports successful results in spraying the trunks 

 and large limbs of several trees with a mixture of iron sulfate and 

 lime-sulfur, and others with Bordeaux mixture. This was done as 

 a preventive measure during the egg-laying season. 



Turpentine Bark Beetle. This is a bark-boring beetle (Den- 

 droctonus terebrans Oliv.) nearly one-fourth of an inch long, 

 brownish in color. It works in the bark of dying trees or 

 stumps of pine trees. Healthy trees are attacked only when 

 the insect is pressed for food. It prefers bark 

 at the bases of the trees or on exposed roots 

 rather than that which is higher on the tree. 



It is often attracted to recently 

 painted buildings or freshly sawed pine 

 lumber by the smell of turpentine. 

 Hibernating as an adult, it begins to 

 fly in April and May, eggs being laid 

 in the late spring. 



There are a few natural enemies of 

 this pest, and large numbers have been 

 found in the stomachs of brook trout. 

 (See Fig. 2.) 



White Pine Weevil. This is a fairly 

 large, reddish-brown beetle (Pissodes 

 strobi Peck), one-fourth of an inch long, 

 with a whitish spot on each side of the 

 back near the posterior end. The sides 



t 1 j I J 1 1 * 4 1 J- XVI. < ' I . i W <J-lllIdl U1JCOLA1UL 



and legS are Somewhat mottled With borer larva and beetle, about twice 



white, and the snout is long and stout. e 



It occurs in early spring, at which time most of the eggs are de- 

 posited in the leading shoots of pine, one egg being placed at a 

 time at regular intervals throughout the length of the leader or 

 shaft of the tree. The grub, after hatching, eats inward and ob- 

 liquely downward into the pith, in which it burrows a short distance. 

 Pupation is passed in the burrow, adults emerging in the spring. 



Injury. The leader being killed, an irregular, deformed tree 

 is the result, termed by lumbermen as " buckwheat pine." Such 

 trees have but little commercial value for lumber. 



Control. Many natural enemies attack this pest. Birds are 

 very effective as checks to its increase. 



FIG. 281. Two-lined chestnut 



