154 



THE MONTHLY BULLETIN. 



an entire clean-up of all surrounding infestations. This fact seems to 

 indicate that the insect is not a strong flier, and proper precautions 

 carried on by the individual property owner will greatly improve the 

 general appearance and health of his oak trees, and at the same time 

 have little fear from an immediate infestation from his less thrifty 

 neighbor. 



The process of eliminating this insect is indeed simple, requiring only 

 a willing, conscientious man — a young man preferably. To remove all 

 infested parts a great deal of climbing will be found necessary, and the 

 success of the operation depends upon the pursuance of thoroughness. 



The tools required in accomplishing the work are not many but all 

 that are listed are quite essential that best results may be obtained. 



Fig. 56. — Undetermined hymenopterous parasite of tlie oalc twig girdler. (Drawing by 



S. Nakayama, Stanford University.) 



These include a long extension ladder ; the longest that may be obtained • 

 will be found to give best results and aid very materially in reaching the 

 infested parts near the top of the tree. Regular pruning shears for 

 close work, and the long-handled pruning hooks are both necessities as 

 well as a good pruning saw. The latter is seldom used in removing the 

 beetle larva, but can be used to much advantage in cutting out some of 

 the dead limbs which have accumulated on the inside of the trees, the 

 removal of which not only improves the general appearance and health 

 of the oaks, but removes the danger of falling branches. 



In many of the larger trees a great deal of climbing about in the 

 iDranches is required, that all parts may be reached. This should not be 



