ADDITIONAL DATA ON TIIK LO("T\ST MoKKK. 8W 



naturul ji^rowth. It will Ih" found, liowpvcr, tluit no !in>a of consid- 

 era'olo oxtont, ovon in such lociilitios. is entirely five from this and 

 other (h'structix (> insect enemies, and that certain j)re(autions and 

 well-planned methods of manai,''ement w ith reference to the control of 

 the latter will l>e necessary. 



MANACKMENT OF I'LANTATIONS TO PREVENT IN.7UUY. 



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 

 .lune, not only of the area to be utilized but of the entire neighbor- 

 hood 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 })lan of 

 cooperation between the owners of the land or trees, is one of the 

 most important recpiisites for success in preventing future* losses from 

 the ravages of this and other insects in small as well as large planta- 

 tions. 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 iiny locality. 



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 boi-ers in th(* wood, 

 and to conduct the thinning and commercial cutting operations during 

 th(» ])eri()d between October of one year and April of the next, in 

 order to destroy the young borers before they enter the wood. 



Worthless, scrubby. borcM'- infested trees should be killed outright by 

 strip])ing the bark from 4 or 5 feet of the lower stem during August to 

 prevent sprouts and seed pridiiction from them, and at the same time 

 to destroy the eggs and young l)orers. Trees deadened in this manner 

 will usually be so completely killed that not a single root sprout will 

 app«\ir. Therefoi-e this m(>thod is of special value in preventing 

 sprout reproduction from inferior in«li\idual trees. 



SELECTING AND HKKKDINO !?< )HER-RESISTANT TREES. 



The fact that some trees are more oi' less resistant to attack or iiijui-y 

 by the borer, while adjacent ones in the same gro\ c are attacked yeai' 

 after year and seriously damaged, suggests breeding races and \arie- 

 ties of the species which would be permanently resistant. 



Breeding experiments have been begun in cooperation with the 

 Bureau of IMant Industry and the Foi-est SiMvice, but it will ret|uire 

 several years to get definite results. In the meantime, however, it is 

 imi)oitant that seed and cuttings for connnercial planting should be 

 .selected, as far as ])ossible, from trees which show least damage from 



