ROOT DISEASE IN SCOTS PINE ON FARM LANDS. 1 49 



Explanation of Plates. 



The accompanying Plates, which are drawn from Photographs, show Scots 

 pine roots gi-own on old farm lands. 



Figs. I and 8. Roots of trees growing in close portions of otherwise severely 

 attacked afforestations — 55 and 60 years old. Neither of these 

 roots systems shows any traces of the disease, and they are almost 

 normal in their development. They represent exceptions. 



Fig. 2. Roots of a 50 year old tree left on a large blank — its foliage was still 

 normal, but height-growth had almost ceased for some years. The 

 tree was, however, still struggling with the disease. 



Fig. 3. Roots of a 45 year old tree, in a heavily diseased area, still living but 

 doomed ; the foliage was thin and off colour. The shape and 

 development of the root system are quite typical of those of farm- 

 land grown Scots pine. 



Fig. 4. Typical formation of roots of a tree that has got over the disease after 

 a severe struggle. The tap-root was dead, but had been replaced 

 by numerous deep-reaching branch roots. The crown develop- 

 ment, also typical, showed by its rounded formation that for a 

 considerable time no growth in height had taken place, but a 

 vigorous shoot growing out of it proved that the crisis was over. 



Figs. 5 and 6. Roots of trees 45 and 50 years old, which had passed the 

 crisis and were convalescent. The regeneration of the root 

 system had established itself, and growth in height had recom- 

 menced. 



Fig. 7. Roots of a dying tree, 40 years old. A severe struggle for life was 

 evidenced by the formation of a second large root, after the first 

 had died. 



