574 [ DISEASES OF THE VINE. 



Except in the case of vines grafted on unsuitable 

 American stock, ferrous sulphate or green vitriol gives 

 the best results in the treatment of chlorosis from what- 

 ever cause. The stems and branches of the vine may be 

 painted over in winter, in dry weather, with a solution 

 containing 25 to 40 per cent, of ferrous sulphate dissolved 

 in winter. A weak solution containing | to one per cent, 

 of the same substance may be usea lor spraying the 

 foliage in spring and early summer ; and the cyistals of 

 green vitriol may be applied to the soil early in winter at 

 the rate of 100 to 300 grammes for each vine. 



Roncet. This a French term, the Italian equiva- 

 lent being arricciamento. This strange diseases is 

 characterized by the formation of shoots having short 

 internodes, arising in bundles of two or more shoots 

 from the same bud, with short stalked, small, deformed 

 foliage, acutely and irregularly toothed, and generally of 

 a light green or yellowish colour. The bunches become 

 greatly elongated and much shanked owing to the abor- 

 tion of the flowers. The formation of new shoots in 

 spring is more or less delayed, and in severe cases the 

 shoots spring out in great numbers from all likely points 

 of the stem and branches, but remain short and un- 

 developed, and the plant assumes a characteristic ap- 

 pearance (calmickage = cavolismo), and blackish irregular 

 spots are formed on all green tissues, showing that there 

 is a grave alteration in the processes of nutrition. The 

 nature of this disease is still unknow, but does not appear 

 to be due to parasitism. Cuttings or scions taken from 

 diseased plants perpetuate the evil, while on the other 

 hand, the roots seem to be always healthy, and a healthy 

 scion grafted on diseased stock develops into a healthy 

 plant. This disease is rather frequent in our vineyards, 

 but in its lighter forms it is generally overlooked, so that 

 cuttings are taken from diseased plants and planted and 

 of course in their turn develop into diseased plants. 



