THE LOCUST BORER. 



11 



SpwvrraMfi 



Oy/i/i/c/ 



It should bo iviuemboroJ tluit all tin- holes t'ouiKl in a trcf and all 

 other damage by the borer are not thi^ work of one ^^'iicration, luit 

 usually that of repeated animal attack during the life of the tree; 

 also, that a burrow in the sapwood of a young tree riMuains the same 

 burrow in the heartwood of the old tree, without change, except in 

 the healing of the original entrance; therefore the number of borers 

 and the amount of damage each year is not 

 so great as it might appear, and, while each 

 female is doubtless capable of depositing 

 more than a hundred (}gg>^^" it would ap- 

 pear from the writer's observations that 

 oidy a small percentage of the larv;e hatch- 

 ing from them survive the bark-infesting 

 stage or complete their development to the 

 adult stage. This suggests that any method 

 of management which will insure the de- 

 struction of a large number of larva' and 

 beetles each year will reduce the damage 

 to a point where there will !)(> practically 

 no loss. 



SUGGESTIONS FOR CONTROLLING THE 

 INSECT AND PREVENTING LOSSES. 



With our i)resent knowledge of the life 

 history and hattits of the locust l)orer. it 

 would appear that the following sugges- 

 tions might V)e of practical value in the 

 control of in>ects in large plantations and 

 forests. 



The fact that the young larva- from eggs 

 deposited during the -;ununt'r remain in the 

 outer bark duiMnu the winter and do not 

 enter the wood until the following May 

 suggests that if locust for all purposes were 

 <'ut between November and May. the bark removed from that })orti<»n 

 which is of value, and the r(>maindei' luirned. it would destroy \a-«t 

 numbers of the ins«H-ts and conti"il»ute greatly toward the prot<'ction 

 of the remaining gi'owth. 



The fact that t»adly infested tree> may l)e detected duiing May. 

 fTune. and .Inly by the ejected sap and l»oring>. suggests thi> simple 

 method of locating such trees, which should be cut close to the gi'ound 

 and burned, before the liist of .Vugust. to destrov the borers before 



X,. 6.— TllL- luCU.-il b">rt'r yVijItim 



robinitr): Reproductive organs of 

 iVmale beetle. Hiphly iiiaptiiHe'l 

 ifiriirinnl i. 



"An examination of the Qvarit'.s (fig. 6) of beetles collected in .\ugu."t shows that 

 tliey may contain as many as titty mature eg^'s at one time, in addition tn a lai>:e 

 numl)er of immature ones. 



