186 GRAPE CULTURE AND 



Varieties particularly subject to the effects of oidium are the 

 (Muscat, Chasselas, Zinfandel, Folle Blanche, Crabb's Black 

 Burgundy, Teinturier, Gamay, Cabernet Sauvignon, Caber- 

 net Franc, Riesling, Carignane, Terret andCinsaut.) Among 

 those little susceptible are the Grenache, all of the true 

 Pinots, the Alicante Bouschet, Petit Bouschet, Colombar, 

 Sauvignon blanc and the Aramon. The American grapes 

 Vitis Labrusca, V. Riparia and V. Rupestris are but little 

 affected by oidium. 



REMEDIES. 



Many substances have been applied principally in the form 

 of powders lime has been extensively employed, and it has 

 been found that any dust effects beneficial results on the 

 diseased plant. None have proved so efficacious, however, as 

 sulphur dust, and on this we can rest our perfect reliance, for, 

 if properly applied, it affects all that may be desired in the 

 way of a cure, and is comparatively inexpensive. The oidium 

 is a disease quite easy to treat, because its spores and growth 

 are confined to the exterior and exposed portion of the plant, 

 which is not the case with the peronospera viticola and some 

 other vegetable parasites. 



THE APPLICATION OF SULPHUR AS A REMEDY. 



There have been many conflicting and erroneous state- 

 ments made concerning this remedy, its application and 

 effects as applied in California. Imperfect and hasty gener- 

 alizations, drawn from limited local experiences, have not un- 

 frequently been published and results both expensive and 

 wasteful have often followed. To correct the wrong impres- 

 sions thus formed and save further dispute, it seems neces- 

 sary to treat the subject in a somewhat technical manner, the 

 truth on some points of which it seems to me precludes the 

 possibility of further dispute as to kinds which should be 

 employed ; the difference in the effect of various brands, im- 



