380 Water N. Hess 
Artificial control 
_ The insect can be artifically controlled by cutting all recently killed 
pines and removing the bark before the first of March. This will kill 
the larvae and the adults, and will do much to lessen attacks the following 
season. Where possible, the placing of newly felled logs in water will 
prevent attack. Putting logs in wet places will greatly reduce infestation, 
though it may hasten the decay of the timber. Repellents such as carbo- 
lineum, applied in May, will usually prevent oviposition. 
A few years ago the ribbed pine-borer was exceptionally abundant 
about Ithaca; but during the past few years, due to the improved methods 
employed in this region by the Department of Forestry, at Cornell Uni- 
versity, these insects, together with many of the more injurious forest 
insects, have nearly disappeared. This has been largely due to the practice 
of cutting and removing all trees as soon as they die or are found to be 
dying. 
