HEART-ROT 



109 



Soil. 



(a) From pot in which young 

 larch had been growii : | 

 sandy loam : slightly L 

 acid : humus and nume- 

 rous dead roots of larch / 



(6) Sand with oak humus : \ 

 no lime : markedly acid : I 

 deep black colour j 



(c) Beech humus : lit! le lime : i 



some roots : brown L 

 colour j 



(d) Soil from beneath spruce 



containing needles and 

 roots: much lime: brown 

 colour 



(e) Clay with flints, fronij 



above chalk : beech i 

 humus j 



(/) We]] -manured light arable ) 

 sand ) 



(r/) Moderately manured ) 



heavy arable sand ) 



(h) Sycamore humus 



(/•) Sandy loam from Douglas 

 plantation wliicli liad 

 been attacked by Fames 

 annosns 



(I) Same wood as (/,■), bufi 

 where Douglas was I 

 healthy j 



(/«) Same wood as (/), l)ut ^ 

 another ])art \ 



(n) From larch and l)eech 

 wood near a fructifica- 

 tion of Forneys aminsiiM : 

 loam above chalk 



(o) From near spruce at- 

 tacked by Polj/porvs 

 Sdiveinitzii : oak a})ove : , 

 loam aljove chalk J 



{ji) From near spruce killed | 

 by Poly par us Schweinit- 1 

 zii : very open wood : [ 



loam above chalk 



Not 

 sterilized. 



no growth 



Auto- 

 claved. 



good growtli 



fair growth 



good growth 

 fair growth 

 good growtli 



fair growtli 



very poor 

 growtli 



fair growth 

 good growth 



fair growth 



good growth 



Dry 



sterilized. 



no growth 



slight 

 growth 



fair 

 growth 



no growth 



poor 

 growth 



fair 

 gro\vth 



no growth 



The test for the growth of Fotnei annosns in each case 

 was the appearance of conidiophores, and if these were not 



