t7H 



I'nOTHC'lION AOAINST KUNfil. 



apple, are also attacked. It is found in thickets 5 to 7 

 years old, hut also in 100 years old woods, and is worst 

 anionfjfst healthy smooth-harked trees. 



Infected hranches eventually die, and infected trees in the 





I' I'-'. 'S4'l. Nertria dili 

 Tul., on a heech. a Com- 

 mencement of [jjic <lisea.sp, 

 wliich lias proceeded deeper 

 into tlie wood nt h. 



Fig. 233. — Canker on an oak niused l)y 

 Xectria ditissima, 'liil. 



course of time assume extraordinary shapes, and are fit only 

 for firewood. 



TIk; disease has heen known since 1805 in the Saxon Erz 

 mounlains iind in the extensive beech forests in Hesse. It is 



