BULLETIN 197. 



GRAPE CULTURE IN CALIFORNIA. 



149 



yard should be gone over in as short a time as possible. This will 

 be a thorough sulfuring. To be effective, it must be followed imme- 

 diately by two or three days of warm weather. Unless this happens, 

 the sulfuring should be repeated as many times as are necessary until 

 the proper weather conditions are obtained. 



FIG. 14. Mourvedre x Rupestris 1202. One half natural size. 



Mysterious Dying of Vines ("Anaheim Disease"}. The vine, like 

 most plants, especially fruit trees, which are cultivated on a large scale, 

 is subject to diseases of more or less intensity whose cause is not 

 thoroughly understood. These diseases are (1) caused by parasitic 

 organisms which have so far escaped detection, or (2) what is usually 

 known as ''physiological." 



Physiological diseases are presumably due to some unfavorable con- 

 ditions. For example, chlorosis, cr the failure of the leaves to develop 



