202 Commercial Gardening 



cinerea. This is one of the commonest of moulds we have in this country, 

 and may be met with on decaying vegetable matter everywhere. It can 

 only become a parasite in the presence of an excess of moisture and in 

 a stuffy atmosphere. Its presence on Vines can only be attributed to 

 gross neglect in ventilating, more especially early in the day. When the 

 fungus once gains a foothold it is difficult to exterminate promptly, as 

 spores are produced in rapid succession and in immense numbers, and 

 are dispersed by wind, watering, &c. A fairly dry atmosphere is fatal 

 to the fungus, and aided by spraying with sulphide of potassium will 

 restore things to order (fig. 393). 



Crown Gall. This disease is very prevalent on Vine roots. Described 

 under " Loganberry " (see p. 163). [G. M.] 



