INSECT DEPREDATIONS IX NOimi AMKHKAN FORESTS. 81 



soon as it is felled and by convert inir the l)()lts into ihe sniallesl \)Viu-- 

 ticablo dimensions and pilinp^ them in siieli a manner as to facilitate 

 i-apid drvin*;. 



Damaii'e to iniseasoned iiaiidle and \va<>;()n stock in the i'on<ih can he 

 prevented hy takinji; special precantions 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 dnrinjr the winter and sprin^j. 



I)ama<re to j)nlpwood and cordwood can be prevented to a jjreat 

 extent by i)lacin<>: the sticks of wood in trianj^ular or cril> piles im- 

 mediately 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, be- 

 fore it is piled will also jirovide against damage from insects. 



AIaNCFACTIKII) rUODVCTS. 

 VNSKASONKl) I'KOUCCT.S. 



Freshly sawed hardwood hmiber placed in close piles during warm, 

 damp weather in the period from July to Se})tember. 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 i)iling will tend 

 to prevent loss. It is important, also, that heavy lumber should, 

 as far as possible, be cut only in the winter and piled so that it will 

 be well dried out before the middle of March. 



The damage to lumber and s(]uare timber when the bark is left on 

 the I'dges or sides can be |)revented by removing the bark before or 

 innnediately after the hnnl)er is ^awed, or by sawing and i)iling the 

 matei'ial during the wintei'. or if sawed at otliei' times it should be 

 pileil so that rapid drying will be facilitated. 



SKASONKI) I'UODICTS. 



T'/if/i/s/t((/ snisotirtl prod nits. — Injury by pow(ler-]>ost ixM'tles to 

 dry hardwood lumber and other material in stacks or storehouses can 

 be |ire\enled as follows: 



(1) Have a general inspection of the nuiterial in the yards anil 

 ston^houses at least once a year. preferal)ly dui-ing November or 

 February, foi- the |)urpose of (ii) sorting out and desti'oying oi' other- 

 wise disposing of any mat<'rial that shows th»> slightest evidence of 

 injury, as indicated by the presence of line j)owdery boi'ing dust, and 

 {h) sorting out aiul destroying all old ami useless sa|)Wood material 

 of any kind that will oll'er favorable breeding i)laces for the insects. 



