THE LOCUST BORER. 13 



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. 



SUBSEQUENT MANAGEMENT. 



In the subsequent management of plantations and of natural forest 

 and sprout growth it is important each year to locate and destroy the 

 worst infested trees for the purpose of killing the borers in the wood, 

 and to conduct the thinning and commercial cutting operations during 

 the period between November of one year and May of the next in 

 order to destroy the eggs and young 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 } r oung borers. Trees deadened in 

 this manner, as was demonstrated near Morgantown, W. Va., some 

 years ago, may 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. 



COLLECTING THE BEETLES EROM GOLDEN-ROD FLOWERS. 



Collecting the beetles from golden-rod flowers, b\ T means of insect 

 sweep nets, before they deposit their eggs, would be advisable, even 

 for the protection of large plantations, and, as has been suggested, the 

 planting of patches of the plant, or the cutting of all but certain strips 

 and patches of natural growth for this purpose, would serve to con- 

 centrate the beetles where the} r could be caught in the nets and 

 destroyed by emptying them into a pail containing water covered 

 with a film of kerosene. 



POISONED BAIT. 



Experiments should also be made with poisoned baits, as suggested 

 on pages 7-8. 



SUGGESTIONS FOR PROPAGATING BORER-RESISTANT TREES. 

 FROM SEED (SEXUAL METHOD). 



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

 from attack or injury by the borer, while adjacent ones in the same 

 grove are attacked } T ear after year and seriously damaged, suggested 

 the idea of breeding races and varieties of the species which would be 

 permanently immune. This suggestion was included in the plan for 

 cooperative investigation mentioned on pages l-± It was then thought 

 that if the seed for general planting were collected from immune trees 



