182 The Farm Woodlot 



trees under four or five inches in diameter, so that they will 

 usually reach fence-post size before the borer attacks 

 them. This, however, does not always hold, true, and oc- 

 casionally trees of one or two inches are badly riddled. 



Little can be done to destroy these borers except to cut 

 down and burn the infected trees in winter or early spring. 

 The insects seem to attack more readily the trunks that 

 are in full sunlight and hence dense planting may be a 

 preventive. They can be kept from lawn trees by 

 spraying or painting the trunks with something offensive 

 to the insects. This is somewhat objectionable, and too 

 expensive to apply in plantations. 



