168 



MANUAL OF MODERN VITICULTURE. 



The conditions favorable for effective sulphuring are : 

 Dry and hot weather, leaves perfectly dry, a slight wind 

 facilitating the diffusion of the sulphur, and a temperature 

 reaching from 77 to 86 Fahr.* 



(B.) ANTHRACNOSIS. 



This disease is also caused by a microscopical fungus, the 

 Sphaceloma ampelinum. It is recognisable by spots or 

 cankers appearing on the green parts 

 of the plants (young shoots, veins, 

 green berries) ; these spots are 

 areolar and completely black (punc- 

 tuated antkracnosis of Dunal) ; others 

 are sometimes more or less elon- 

 gated, irregular, and fringed with 

 black (maculate anthracnosis of the 

 same botanist). The spots are small 

 at first and extend little by little, 

 sinking in the tissues (Fig. 148). 

 They may cause the vine to become 

 stunted, and appear as if submitted 

 to strong pinching ; the leaves and 

 berries are stopped in their growth 

 (Fig. 149), the leaves being some- 

 curled. It generally results 

 in complete destruction of the crop 

 and, perhaps, in other phenomena not yet well known. 



It is more especially in damp seasons in low soils and in 

 foggy climates that anthracnosis prevails. The vines most 

 liable to it are : Carignane, Alicante- 

 Bouschet, Clairette, Brun Fourca and 

 Teoulier amongst the V . Vinifera ; Pauline, 

 which has it almost in a chronic state and 

 under a special form ; Jacquez amongst 

 the V. ^Estivalis ; and finally, the Solonis 

 amongst the V. Riparia. 



There are two means of combating anthracuosis : 1st. Pre- 

 ventive treatment ; 2nd. Curative treatment. 



1 st. Preventive treatment. One must avoid planting vines 

 liable to the disease in situations favorable to its develop- 

 ment. Drainage may be applied successfully to remove an 



* See H. Mares (Soufrage des vic/nes malades, &c. Montpellier, 1856. F. Seguin, libr.- 

 edit.). This book has become classical in the South of France. 



Fig. 148. Shoot attacked by timp<? 

 anthracnosis (after H. Mares). 



Fig. 149. 



Berries attacked by 

 anthracnoyis. 



