13 



main cause, is at least an auxiliary cause, because as soon as the 

 vine is affected by adverse conditions, the disease also becomes 

 more active. But an American vine, ungrafted, (Rupestris St. 

 George, Lenoir, Champini and a few others) will recover from 

 Fprm II, if placed under more favorable conditions. A Vinifera- 

 grafted, hardy American vine may also recover after the top has 

 died, even if the latter should show Form III. I have a few 

 Rupestris St. George vines on the place as examples of this latter 

 possibility, which are exceedingly vigorous and healthy at the 

 present time. The extremely heavy bearing of a vine, induced 

 by too long pruning and exceptionally long dry summers are 

 probably the most fruitful causes for the development of the 

 disease into an acute stage. 



There are two other forms of the disease, in both of which 

 infection seems to take place through parts of the vine above 

 ground, the bloom and some other portion of the foliage. These 

 two forms do not occur much and apparently affect only vines, 

 which have become considerably weakened by the root Form II. 

 They seem to occur mostly in such places, where on account of 

 the nature of the climatic conditions or the nature of the grafting 

 stock the stage of the disease as Form II is much prolonged. 



My observations regarding the Anaheim disease have been 

 made in the Santa Cruz Mountains and if they should not corre- 

 spond with the behavior of the vines, attacked by it in other places, 

 allowance must be made on account of the probable difference 

 in the climatic conditions. 



THE ANAHEIM DISEASE A NATIVE OF THE EASTERN 



STATES. 



It appears to me that the organism, causing the California 

 vine or Anaheim disease, must be a native of the eastern States, 

 but existing mostly as Form I, and the disease occurring occasion- 

 ally as Form II and causing the death of vines. Although the 

 evidence, which I can bring in support of this claim, is all cir- 

 cumstantial, I consider it exceedingly strong and after giving two 

 reasons, which have led me to think so, shall proceed from the 

 supposition that it is correct. 



In the first place the manner in which American vines as 

 well as Viniferas die in the eastern States, reminds one very much 

 of the death of vines by Form II of the Anaheim disease in Cali- 

 fornia. Mr. T. V. Munson, to whom I am much indebted for in- 



