226 MANUAL OF AMERICAN GRAPE-GROWING 



sometimes attacks grape roots or even the vines-above ground. 

 Occasionally, the disease is rather serious, but it is not often 

 to be reckoned with in the vineyard regions of America. Fungi- 

 cides are useless in combating the disease and all that can 

 be done is to exercise great care in planting infected stock. 

 It is doubtful whether crown-gall ever seriously injures vines in 

 northern regions, although it may occasionally do so in the South. 



In California there is a somewhat mysterious disease known 

 as "Anaheim disease," because of its having first made its 

 appearance in the vicinity of Anaheim. As near as can be 

 learned, the disease first appeared in 1884 and then spread 

 rapidly from forty to fifty miles from the point where it began 

 its ravages, causing direct and indirect loss of many millions 

 of dollars, and leading to the abandonment of grape-growing 

 in some parts of southern California. Fortunately, in recent 

 years the Anaheim disease is less aggressive but still does more 

 or less damage. The nature and the treatment of this disease 

 are not as yet fully determined, although several experimenters 

 are studying the trouble. Californians whose vineyards suffer 

 from this disease should apply to the experiment station at 

 Berkeley for the latest information in regard to it. 



Coulure is another trouble of the vine in California of which 

 little is yet known, either as to cause or treatment. The term 

 signifies the failure of the fruit to set or to remain on the clusters. 

 The trouble occurs in varying degrees from the loss of a few 

 berries to the complete shelling of the fruit from the stem. It 

 is worse in some localities than others and in some varieties 

 than others. Various causes have been assigned to the disease, 

 chief of which, and most probable, are unfavorable climatic 

 conditions. 



CONTROL OF INSECTS AND DISEASES 



From the number of insects and diseases found on the grape, 

 it would seem that, literally, "pestilence walketh in darkness 



