Necrosis of the Grape Vine. 



341 



not very rapid and it would be possible, no doubt, to obtain a two-year- 

 old grape root that would show no signs of the disease. In a few years 

 more, however, the efiect 

 would be very marked. This 

 appears to be the explanation 

 of the dying of so many vines 

 in the young vineyards at 

 Brocton and elsewhere. 



Experiments are now un- 

 der way to determine means 

 of detecting diseased cuttings 

 in the nursery as well as to 

 find out what percentage of 

 the vines are diseased when 

 spotted canes are used as 

 stock. Obviously, this will 

 require observations for sev- 

 eral years, and so long as re- 

 sults of this test are lacking 

 the above must remain hypo- 

 thetical. As a hypothetical 

 condition, however, it is 

 worthy of consideration since 

 a little care in the selection 

 of stock now may be the 

 means of saving a great deal 

 of expense and labor later. 



CONTROL 



Obviously, the spraying or 

 washing of the trunk with 

 vitriol or other poisonous 

 chemicals will have no effect 

 in curing a diseased vine. 

 The fungus is inside and 

 cannot be reached in this 

 way. The problem of the 

 cure of a diseased vine 

 would be that of injecting, 

 or feeding through the roots 



Photo. June 22, 1908 



Fig. 57. — Concord. A diseased renewal. Dis- 

 ease had worked into root before old trunk 

 was pruned off 



