342 Bulletin 263. 



(as fertilizer), some toxic substance. But such a procedure would as- 

 sume that the fungus would more readily succumb to the poison than the 

 living cells of the vine itself, and while such instances are known in the 

 case of some fungi (Massee '03), so far as the writer knows no one has 

 made an attempt to determine the facts in the case of this organism. Even 

 if such a method of treatment should cure a vine, it is questionable whether 

 it would be practicable and for that reason should be left to the investiga- 

 tor to determine. Such experiments are planned for another year. 



The thorough spraying of the trunks and green shoots of the vines 

 late in May and early June would be of value in preventing new infec- 

 tions from the spores developed at that time. Many vineyardists spray 

 for fungous rots and insect pests, and it would be an easy matter to give 

 the trunks a little more attention. For those who spray for insect pests 

 alone it would not be a great deal more expensive to make up the insect 

 poison in Bordeaux mixture, using the same proportions as though the 

 Bordeaux mixture were water. 



Since a vine once diseased is almost sure to die sooner or later, eradi- 

 cation would seem to be one of the best means of control. A diseased 

 vine left in the vineyard is a menace to its neighbors and may be the cen- 

 ter for a general infection. Eradication of this disease means the re- 

 newal of the entire vine or of only a part of it. Figure 57 represents 

 a case in which the removal of the entire vine would be necessary. 

 Figure 54, which is the same vine as is shown in Figure 43, illustrates a 

 case in which the whole root crown is still healthy and by cutting off 

 the trunk near the ground the large sucker seen in Figure 43 would soon 

 develop into a healthy vine. 



A number of the Chautauqua vineyardists practice this renewal sys- 

 tem in a general way, but Mr, John B. Goggin, at Silver Creek, has set 

 about systematically to eradicate this disease. In 60 acres, he has re- 

 newed about one-fourth of the vines. On June 22, 1908, the writer had 

 the opportunity of going over, with Mr. Goggin, this vineyard where 

 many renewals of four and five years were bearing an excellent crop 

 of fruit and were apparently in perfectly healthy condition (Fig. 56). 

 Occasionally a renewal has come diseased (Fig. 57), and it was because 

 of such cases that this visit was made. Apparently there were two dis- 

 eases in the vineyard, one that could be controlled by the renewal system, 

 another that could not. A study of Figure 54 will reveal the true 

 source of the difficulty. In most cases Mr. Goggin had eradicated the 

 disease but in some the fungus had grown into the root crown and thence 

 into the renewal. According to Mr. Goggin's observations, repeated re- 



Cos) Massee, G. Jour. Royal Hort. Soc. London, 28:142-145, 1903. 



