131 



Leaf diseases, affeftiug assimilation and transpiration — 



Rusts, caused by urediueae (Gymnosporaugium sup.). On apple, 

 pear, quince and red cedar. Not reported as very destructive 

 on cultivated apples : common on wild crabs or thorns. 



(Puccinia rubiyo-vera.) On wheat. This is the leaf rust and is 

 usually common, but not especially injurious, 



(Puccinia graminis.) On wheat and other cereals. This is the 

 stem rust and only rarely occurs to any extent on the leaves. 



(Puccinia carouata.) On oats. Occurs very commonly on leaves, 

 but is not accountable for losses of any extent. 



(Uromyces trifalii.) On clover. Not known to be of much eco- 

 nomic importance, though quite common. 



(Puccinia poarum.) On blue-grass, often in lawns. 



(Puccinia sarghi.) On coim. Very widespread and common, but 

 not especially injurious. 



(Gymnoconia iiiterstitiaiis.) On blackberry and raspberry, called 

 the orange leaf rust. Has a perennial mycelium, but mani- 

 fests itself only in the lea^'es. Conunon and distructive. 



(Kuehneola albida.) On blackberry and raspberry. First noticed 

 tliis season. Not of importance. 



(Uromyces appendiculatus.) On beans. T^xtent and damage un- 

 known. 



(Uromyces caryapbyllacearum.) On carnations in greenhouses. 



(Puccinia chrysanthemi.) On chrysanthemums in greenhouses. 

 Spots and Biights — 



(Phylosticta spp.) On apple, often causing premature defatiation. 



(Cylmdrosporium padi.) On cherry and plum. Not uncommon. 



(Septoria ribes.) On gooseberry and currant. Extent unknown; 

 crop of miuor importance. 



(Septoria lycos])ersici.) On tomato. Very injurious in some lo- 

 calities. 



(Cercospora beticola.) On beets. Two reports have been received. 



(Atternariae brassicae nigressceus.) On muskmellons. This is 

 known as the leaf blight and is very injurious in some lo- 

 calities. 



(Calletobuchuni Lagenarium.) On melons. Known as anth- 

 raenace. and while affecting leaves, usually attacks stems and 

 catyledons of young plants. Reported by several horticul- 

 turists. 



