XX PLANT DISEASES 



two or three times to young nursery stock, the plants are 

 much retarded in development, or not unfrequently die 

 outright. Various other kinds of conifers, in addition to 

 the silver fir, are subject to this disease. 



PREVENTIVE Measures. — It is important in selecting a 

 site for a nursery to ascertain that diseased Cowberries are 

 not present in the neighbourhood. Diseased plants are 

 readily recognised by the characters already given, more 

 especially by their erect habit and great height. If not 

 abundant, all such may be removed and burned. 



