Plant Diseases. 47 



Gooseberry. MILDEW (Sphosrotheca Mors-uvce, B. & C.). 



A downy mildew attacking the fruits and young growth of 

 English varieties of gooseberries (varieties of Ribes 

 Grossularia}. 



Remedy. Spray at intervals during the season with 

 potassium sulphide. 



Grape. ANTHRACNOSE or SCAB (Sphaceloma ampelinum, 

 DeBary). The fungus attacks the leaves in small spots, 

 and also the fruit, where it forms hard and sunken brown 

 or black large scab-like patches. General in distribution 

 east of the Mississippi. Probably introduced from 

 Europe. 



Remedies. Sulphur fungicides, as sulphur, sulphate of 

 iron, eau celeste. Repeat application frequently and begin 

 before the leaves appear. 



BLACK-ROT (Lcestadia Bidwcllii, V. & R. ; Phoma uvicola, B. 

 & C.). Attacks the young berries. The fruit becomes 

 black, hard, dry, and shrivelled and is covered with min- 

 ute pimples. Occurs generally east of the Rocky Moun- 

 tains. Of American origin. 



Preventive. A board placed over the trellis, as men- 

 tioned under the downy mildew, is some protection ; but 

 the remedy is certain : 



Remedies. Spray thoroughly with Bordeaux mixture 

 every week or ten days for six weeks or more, beginning 

 before the flowers open. Sulphate of copper may be used 

 also. Burn infsted fruits in autumn. 



NOTE. The following are synonyms for Black-rot : 

 Sphceria Bidwellii, Physalospora Bidwellii, Phoma uvicola, 

 Phoma uvicola, var. Labruscce, Sph&ropsis uvarum, Phoma 

 uvarum, Nemaspora cempelicida, Phyllosticta Labruscce ( ' ' the 

 leaf-spot" form), Phyllosticta viticola, Phoma ustulatum. 

 Phyllosticla ampelopsidis, Sacidium viticolum, Septoria 

 viticola, Ascochyta Ellissii. 



DOWNY MILDEW (Peronospora viticola, De Bary). Appears 

 in small frost-like patches on the under surface of the 



