BULLETIN 197. GRAPE CULTURE IN CALIFORNIA. 147 



grapes. It is grown extensively in France, Spain, Sicily, Portugal, 

 and Roumania, and has given good results wherever tried. In Cali- 

 fornia its vigor is remarkable, exceeding even that of Rupestris 

 St. George. 



OTHER VINE DISEASES. 



Oidium. The cause and treatment of this disease have been dis- 

 cussed in Bulletin 186, and the recommendations in it have been 



FJG. 12. Riparia x Rupestris-Cordifolia 1068. One half natural size. 



followed by a large number of growers this year in all parts of the 

 State, usually with success. 



All of the reported failures which have been investigated have been 

 due either to the incomplete carrying out of the recommendations, or to 

 the fact that the vines 'were suffering from some other cause which 

 had been mistaken for Oidium. 



