C (1 X T I- NTS. 



Page. 



Seasonal liistory ol 



Hibernation 'M 



Activity of the overwintered larva- 81 



Activity of the adults 82 



Variation in seasonal history between different latitudes and altitudes ... 32 



IIal)its of larva' and adults 33 



Kcniioniic features 84 



Destructive character of tiic work 84 



Evidences of attack 34 



Favorable and unfavorable conditions for destructive work 85 



Natural enemies 85 



Insects 85 



Disease and sap flow 36 



Methods of control 36 



Time to cut locust to destroy the young larv;r 36 



Destruction of infesteil trees and wood 87 



iSprayiug the trunks and l)ranches to kill the young larva- 87 



Poison bait 8S 



Damage to cut wood and danger of introilucing tin- insect into new 



localities 38 



Selection of localities for extensive plantings 38 



Management of plantations to i)revent injury 39 



Selecting and breeding borer-resistant trees 89 



III 



