Forest Sanitation 



By 

 John S. 3oyc 



In the broadest sense a tree <?isoaao may be do- 

 fined as any disturbance of the normal functions of a treo 

 and this may be caused by funrl, mistletoes, insects, im- 

 poverished condition of the soil, poisonous gases in the 

 air, and nuneroua other agencies. However, for the pur- 

 poses of this erticlo, fun^l anf mistletoes alone rill be 

 considered as the cause of treo diseases. 



Forest tree diseases oaueed by fungi and raistle- 

 toas may, fron a practical standpoint, be divided into tr-o 

 classes first, those 'Jiich destroy our present capital 

 of tinber and second, those reducing our future oepltal. 

 3th cvnbsos of disease vitally affect our revenue from the 

 tiirber on the Hation*.! Forests. 



The tinber on the Tphoe Ertional Forest affords 

 excellent examples of both classes of dlsoaoe. Among the 

 diseases destroying the present or.pital of timber may be 

 mentioned the stringy brorm rot of '-hite fir caused by 

 Lchlnodontium tinctorum (the Indien ?aint fun.r-is), the dry 

 rot of incense cedar caused by Polyporus amarus, the dry 

 red rot of yellow and su^ar pine caused by Pomes larlois 

 (the Chalky Quinine fun TUB), the rod butt rot *f cestern 

 yellow pino and Doubles :7ir oausod by Polyporus sohvrelnit- 

 zii, and the ~hite pitted rot so common in Douglas fir and 

 western yellow pine ccueed ^y Trenetos pini (the Hins -cr.le 

 fungus). This lest is nlso founr 1 . in sugar pine. There 

 are cortain othor tree dicoEseo -hich clostroy the present 

 caritr.l of timber by r.otunl killing of the trees, but as 

 yet none of theso hf>ve proved tw bo of any importance in 

 the mountain pine forests of District 5. Such c diseaoo, 

 hwever, throatens to entirely orrdioato all the chestnut 

 troos in the east. 



The clseaaoB mentioned are all more or leoo repre- 

 sented on the St. ffothard Sole ''.inin^ Com. any 'c oale near 

 Rorth Bloomfield and an idee of the actual lose in dollars 



