ACCIDENTS, DISEASES, PAEASITES. 169 1 



excess of humidity, but there is a more efficacious treatment 

 generally applied ; this is the swabbing of the stem during 

 the winter, after pruning is done, with a concentrated 

 solution of sulphate of iron. A large number of spores 

 are thus destroyed which would have caused the disease in 

 the following spring. 



This solution is prepared in the following manner : One 

 quart of sulphuric acid is poured over 50 quarts of crushed 

 sulphate of iron, the whole well stirred and then dissolved 

 in 25 gallons of warm water. The solution is applied in 

 February* with a mop made of rags tied at the end of a 

 stick, or better, with a special spray pump. 



2nd. Curative treatment. The substances which give the 

 best results in arresting the development of anthracnosis are 

 sulphur and lime, used alone or mixed. Sulphur must be 

 applied as soon as the disease is detected, the applications 

 being repeated as often as possible, once a week for instance, 

 until the development of the cryptogam is stopped. It is 

 probable, according to R. Goethef, that the action of the 

 sulphur is greater when the leaves are wet, as the spores 

 germinating on them are more sensitive to outside influ- 

 ence; but, as P. Viala pointed outj, the diffusion of sulphur 

 is not as complete when the leaves are covered with dew, 

 and it would be better to apply it directly after the excess 

 of water has evaporated, for it will then come in contact with 

 slightly-developed germs and the above difficulty will be 

 avoided. Mixtures of sulphur and lime seem to have greater 

 efficacy than sulphur or lime used alone. 



Sublimed or triturated sulphur is mixed with bolted lime. 

 The first application is done in the following proportions : 



Sulphur . . ... ... 4 



Lime ... ... ... ... 1 



The second with: 



Sulphur ... ... ... 3 



Lime ... ... ... ... 2 



The third with : 



Sulphur ... ... ... 2 



Lime ... ... ... ... 3 



They are thus repeated for eight or ten days until the 

 development of the disease is completely stopped. 



" August in Victoria. 



t R. Goethe. Mittheilungen iiber den schwarzen Bremer und den Grind der Reben. 

 [Tnuis.] Berlin, 1878. 



t Pierre Viala. Les Maladies de la Vigne. 3rd edit., pages 23S-245. C. Coulet. 

 Montpellier, 1893. [Trans.] 



