18 FARMEES' BULLETIN 118. 



In general, these insect enemies, although beneficial, can not be 

 depended upon to keep the destructive beetles under control, and 

 therefore usually can be disregarded when practical control measures 

 are being instituted. 



METHODS OF CONTROL. 



The methods of combating this class of insects and of preventing 

 losses from their ravages come under two primary heads: (1) The 

 destruction of the insects, or remedies, and (2) prevention of attack. 



Infested material, including infested sap edges of lumber, etc., 

 and all refuse sapwood in which the insects might breed should be 

 eliminated by sorting it out and disposing of it by burning or other- 

 wise. All material showing the slightest evidence of powder-post 

 damage should be discarded and destroyed, except possibly such 

 articles as may be tested for required strength and found to be of 

 sufficient value for retention after treatment. 



Material slightly infested and damaged should be treated Avith 

 kerosene oil, after which it should be kept in quarantine a sufficient 

 length of time to determine whether a second treatment is required. 



All partially damaged material, such as the sap edges of lumber 

 and parts of other material too valuable to be destroyed, should, 

 when practicable, have the damaged and infested parts cut away and 

 burned. 



The work should be done between October and the first of March 

 in storehouses, and before the first of April in the open. If this is 

 thoroughly done and, by annual inspection thereafter, infested ma- 

 terial is disposed of as soon as found, there will soon be no trouble 

 from this source, unless there is a continued introduction in lumber 

 and material received from other yards and localities where methods 

 of control are neglected. To avoid this, all material should be care- 

 fully inspected before shipment, or at least before it is placed in the 

 j^ards or storehouses. 



Where it is not practicable to remove the infested parts, or in 

 case of the more valuable stock, the wood should be subjected to 

 methods of treatment for the destruction of the insects between 

 October and the first of March. Of the folloAving remedies, that 

 most suitable in each case should be selected, remembering that the 

 treatment must not be detrimental to the wood for subsequent uses. 



(1) Liberal applications of pure kerosene oil with a brush, or 

 immersion of infested wood in vats of kerosene. The only objection 

 to kerosene is the fire risk. However, kerosene soon evaporates, so 

 that the treated material is not long near the danger point. Kero- 



