310 



INJURIOUS AMI BENEFICIAL [NSECTS OP CALIFORNIA. 



leries are disclosed (Pig. 1505) . These are made in the bark and cam- 

 bium layer of the wood, causing great harm or death to the tree. Jt 

 is also claimed that "the beetles destroy leaves by boring into the 

 base of the buds at their axils." 224 In general only unhealthy or 

 weakened trees are attacked by the beetles, but it does appear that 

 at times perfectly healthy trees also become infested and are event- 

 ually killed. 



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Hi 



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Fig. 304. — -Bark of apricot tree showing exit holes and adults 

 of the shot-hole borer or fruit-tree bark-beetle, Eccoptogaster 

 rugulosus (Ratz.). Enlarged twice. (Original) 



Distribution. — So far this species is recorded as limited in Cali- 

 fornia to the deciduous fruit section adjacent to Ontario, San Bernar- 

 dino County. As the beetle has been taken on nursery stock from that 

 si ction, care should be taken to thoroughly inspect such stock to see that 

 the pest is not introduced to other sections, as it is one which should be 

 avoided if possible. It is unfortunate that nothing is being done to 

 eradicate or check this beetle, for if it is allowed to continue unmolested 

 it will soon be carried to all parts of the State. 



-'SniHlorson, E. D., Ins. Pests, Farm, Garden, Orchard, p. 545, 1912. 



