Xew Yoek Agricultural Experiment Station. 203 



visible upon any of the dead parts and no fungus hyphse were 

 found in the bark or pith. It is not likely that this was winter 

 injury or the effect of drought. We cannot account for it. 



A small amount of leaf spot (Septoria rubi Westd.) occurred in 

 this plantation. 



GOOSEBERRY DISEASES. 



POWBEEY MILDEW.^^ 



(Sphaerotheca mors^vae (Schw.) B. & C.) 



This is the most destructive gooseberry disease. It is reported 

 to have been very bad in Ulster and Columbia counties. One 

 correspondent reports that his Downing gooseberries sprayed four 

 times with Bordeaux mixture were almost free from mildew, while 

 with the variety Industry, given the same treatment, one-half of 

 the crop was ruined. The disease occurred also in Dutchess 

 county. 



ROOT ROT. 



During the past five years a destructive root rot disease has 

 existed in a gooseberry plantation at Marlboro. It started at one 

 comer of the plantation and gradually spread, killing every 

 plant as far as the disease extended. At the present time the 

 affected area measures about 40 by 50 feet. The plants die grad- 

 ually, living from one to four years after the appearance of the 

 first symptoms of disease. Dead canes and living ones occur in 

 the same hill, but the leaves on the living canes are more or less 

 dwarfed. Early in May we had the privilege of examining about 

 a dozen of the affected plants wliich had recently been dug up. 

 Upon the roots of all of them there was a conspicuous white 

 mycelium. It was at once concluded that this fungus was the 

 cause of the trouble, and from the nature of the rhizomorphs 

 referred it provisionally to the form-genus Dematophora. 



In ISTovember the Horticulturist had occasion to remove a lot of 

 seedling gooseberries which had been gro^ving between the rows 



22 For experiments on the treatment of this disease, see Bulletin 161 of this 

 Station. 



