190 



MANUAL OF MODERN VITICULTURE. 



vines, like those having damaged roots, show general 

 signs of weakness ; their fructification increases at first 

 suddenly, the shoots become stunted, the leaves small, 

 although remaining green ; the stump affects the 

 shape of a cabbage, and can be easily pulled out of the. 



Fig. 156. Fructiferous Filaments of Dematophora Necatrix. 



ground. The roots are decayed (whence its name, " pour 

 ries" the French for "decay"). They are brown in colour, 

 saturated with water, which exudes when they are cut ; 

 the trunk alone remains healthy. 



Vines attacked by this disease present the same external 

 symptoms as those attacked by phylloxera or larvas of other ~ 

 insects. The course of the disease is very similar ; it spreads - 

 like a blot of oil on a sheet of paper. Under ordinary cir- 

 cumstances affected vines in the South of France succumb 

 after fifteen or eighteen months. In certain situations where 

 pourridie acquires a large development the harm done may 

 be considerable. 



The condition which seems to induce the growth of pour- 

 ridie" is excessive moisture. Soils resting on an impermeable. 



