38 BUI.LETIN 125. 



On the fifth of June, fresh conidia from Chautauqua county were innocu- 

 lated on living currant bushes in the Horticultural grounds. An incision 

 was made through the bark into the wood of young shoots, and portions of 

 tubercles bearing conidia inserted. No results have yet been obtained from 

 this experiment. 



III. REMEDIES. 



We have seen that the mycelium of the fungus, after having 

 once gained entrance to the plant, lives from year to year in the 

 tissues of the host ; that it may remain there a long time without 

 producing any external indications of its presence ; and that in 

 this way it may be transmitted through cuttings. The first sug- 

 gestion, therefore, is that all cuttings be taken from plants known 

 to be free from the disease. It is not safe to take cuttings from 

 apparently healthy plants in a diseased patch, but they should be 

 obtained from localities where the disease is not present. This is 

 the more important, since the conidia (or summer spores) exist 

 in the soil and on the bushes, so that cuttings are liable to infec- 

 tion through their cut surfaces, as Mayr has pointed out. The 

 trouble being a deeply seated one, and the conidia liable to dis- 

 persion at various seasons of the year, spraying is not to be 

 recommended. The conidia probably do not affect entrance to 

 the plant through healthy parts, but through cut or injured sur- 

 faces. These should, therefore, be avoided as much as possible. 

 The only positive remedy that can be suggested is the removal 

 of the whole plant as soon as the disease begins to be manifested 

 in the yellow foliage and prematurely colored fruits. The 

 diseased plants should be burned, as the spores and conidia may 

 be produced in abundance on dead plants and the trouble com- 

 municated to living bushes. 



E- J. DURAND. 



