New York Agricultural Experiment Station. 267 



stage of the disease. Since these characters show best during June, 

 a time when cultivation is frequent, there is really no excuse for 

 not locating practically every diseased vine in the course of two or 

 three seasons. Such vines should be marked for removal or for 

 special consideration at trimming time. The most convenient 

 method of marking such vines is to carry about a piece of old cotton 

 or linen cloth from which short strips may be torn as occasion 

 demands. These strips should be tied to the affected vines or to 

 the wire. At trimming time they are very conspicuous and are a 

 reminder that the vine needs special attention. Oftentimes the 

 removal of a single arm eradicates the disease. In other cases it 

 will be found that the whole trunk is affected. In case the charac- 

 teristic discoloration and dry rot is apparent in the main trunk of 

 the vine, the vine should be sawed off at a point some distance below 

 the last indications of rot. In many cases it will be advisable to 

 remove the vine near the ground. This will insure the renewals 

 coming from below the surface. The importance of thus marking 

 and removing early all vines showing symptoms of disease cannot 

 be emphasized too greatly. Some growers make a practice of 

 obtaining some fruit from the diseased vine while a renewal is being 

 trained up. Some years this is a safe thing to do but in other years 

 is a very costly procedure. The great danger lies in the fact that 

 the fungus is almost sure to fruit somewhere on the old dead parts 

 and infect the tender shoot which is saved for the renewal. If all 

 source of infection is removed the renewals are sure to grow healthy 

 and develop rapidly into strong vines. 



Every renewal should be inspected carefully sometime during the 

 late summer to see that it has not been infected from some neigh- 

 boring vine or from chance spores carried in from another source. 

 If a renewal shows any indications of being infected it should be 

 rejected. As a general rule it is well to leave two or three suckers 

 at the base of the stump in order to have a selection from which to 

 tie up. 



At the regular trimming time precaution should be made not to 

 leave for bearing wood any canes that show lesions of the disease. 

 At that time the lesions are reddish in color, are slightly elevated, 

 and for the most part are conspicuous. It would be advisable to 

 put up fewer canes than desired rather than to leave affected canes. 



The writer feels very strongly that sufficient attention is not given 



