MANAGEMENT OF PLANTATIONS TO PREVENT INJURY. 



In the first place it is necessary, in order to provide against future 

 losses from the borer, that a thorough survey be made in May and June, 

 not only of the area to be utilized, but of the entire neighborhood 

 for a radius of a mile or more from its borders, for the purpose of 

 locating and destroying scattering trees and groves which are more or 

 less seriously infested or damaged by the borer. It would seem that the 

 control of such large areas, by purchase or 

 under a plan of cooperation between the 

 owners of the land or trees, is one of the 

 most important requisites for success in pre- 

 venting future losses from the ravages of 

 this and other insects in small as well as 

 large plantations. In fact, it is the writer's 

 opinion that with this precaution properly 

 and continuously carried out, locust may be 

 successfully protected from the borer in any 

 locality. 



In the subsequent management of planta- 

 tions and of natural forest and sprout growth 

 it is important each year to locate and de- 

 stroy the worst infested trees for the purpose 

 of killing the borers in the wood and to 

 conduct the thinning and commercial cut- 

 ting operations during the period between 

 October of one year and April of the next, 

 in order to destroy the young borers before 

 they enter the wood. 



Worthless, scrubby, borer-infested trees 

 should be killed outright by stripping the 

 bark from 4 or 5 feet of the lower stem 

 during August to prevent sprouts and seed 

 production from them and at the same time 

 to destroy the eggs and young borers. Trees 

 deadened in this manner will usually be so 

 completely killed that not a single root 

 sprout will appear. Therefore this method 

 is of special value in preventing sprout reproduction from inferior 

 individual trees. 



oorsfi 



Fio. 4.— The locust borer (Cyllme 

 robiid'i') : Hibernation or larval 

 cells in outer portion of living 

 inner barl;. About natural size 

 (author's illustration). 



BREEDING AND PROPAGATING BORER-RESISTANT TREES. 



The fact that some trees are to a greater or less extent immune from 

 attack or injury by th§ borer, while adjacent ones in the same grove are 

 attacked year after year and seriously damaged, suggests the idea of 



