INSECT INJUEIES TO FOEEST PRODUCTS. 5 



while the late fall and winter cuttings should all be worked up by 

 March or April. 



(2) Do not leave the round timbers in the woods or on the skid- 

 ways during the danger period, or, if this is unavoidable, take every 

 precaution to facilitate the rapid drying of the inner bark by keeping 

 the logs off the ground, in the sun, or in loose piles, or else, if possible, 

 the opposite extreme should be adopted and the logs kept in water. 



(3) Remove the bark within a few days after the trees are felled, 

 from poles, posts, and other material which will not be injured by 

 checking or season cracks. 



(4) Take advantage of the proper months or seasons in which to 

 fell or girdle different kinds of trees to avoid danger. 



Damage to products cut from saplings and left with the bark on 

 can be prevented by transporting the material from the woods soon 

 after it is cut, so that it will not be left in piles or bundles in or near 

 the forest during the season of insect activity. Damage may also be 

 prevented if care is taken not to leave the material stored in one place 

 for several months. 



Pinhole damage to stave and shingle bolts cut during a warm season 

 can be prevented by removing the bark from the timber as soon as it 

 is felled and by converting the bolts into the smallest practicable 

 dimensions and piling them in such a manner as to facilitate rapid 

 drying. 



Damage to unseasoned handle and wagon stock in the rough can be 

 prevented by taking special precautions to provide against the same 

 favorable conditions for attack as mentioned in connection with round 

 timbers. This is especially necessary with hickory and ash if cut 

 during the winter and spring. 



Damage to pulpwood and cordwood can be prevented to a great 

 extent by placing the sticks of wood in triangular or crib piles imme- 

 diately after they are cut from the trees, especially if the timber is cut 

 during the danger period, or must be held for a few months during the 

 warm season. Peeling or splitting the wood, or both, before it is 

 piled will also provide against damage from insects. 



Manufactured Products. 



unseasoned products. 



Freshly sawed hardwood lumber placed in close piles during warm, 

 damp weather in the period from July to September, inclusive, pre- 

 sents the most favorable conditions for injury by ambrosia beetles. 

 In all cases it is the moist condition and retarded drying of the lum- 

 ber which induces attack. Therefore any method which will provide 

 for the rapid drying of the lumber before or after piling will tend 



[Clr. 128] 



