144 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



tongas in the soil if worked in about May or June, when the fungus is in 

 a very susceptible condition. At other seasons of the year gas-lime is of 

 no value in this respect. The only practical means of preventing the 

 spread of this disease is carefully to avoid infecting the soil, and this 



FlG, '2H. WlNTSB'BOT (Nectria SOlani). (Gardeners' Clin rnicl e.) 

 a. One of the w hile pustules or warts in section. The fungus has burst through 

 the " skin " of the Potato and formed fruit on the surface. Slightly mag- 

 nified, is. First form of conidial fruit (Munosporimn). Highly magnified, 

 c Second oonidift] form of fruit [Fusariu/m). Highly magnified (the conidia 

 are usually only .'{ septate instead of 5-septate as shown). D. A Fusarium 

 spore, germinating and producing a third form of fruit (Cephalosporium). 

 Highly magnified. B. Aseigerous form of fruit (Nectria), developing on the 

 pustule that previously hore the conidial forms of fruits. Highly magnified. 

 r« Ascus, containing eight spores, produced by the Nectria form of fruit. 



Highly magnified. 



means the removal and burning of all diseased Potatos ; at the same 

 time being careful not to plant slightly diseased " sets," known by the 

 blackening at the base of the young sprouts. 



This fungus also attacks Beet and Mangold, and may possibly also 



