Plant Diseases. 55 



Strawberry (Strawberry-leaf Blight), continued. 



or red spots appearing on the leaves. They eventually 

 become larger and browner, making the leaf appear 

 blotched. 



Remedies. Spray the plants several times early in the 

 season with solution of potassium sulphide. Destroy all 

 affected leaves. The leaves are easily destroyed without 

 injury to the plants by burning off a thin layer of straw 

 which is spread over the patch after the fruit is off. 



Tomato. BLIGHT (Cladosporium fulvum, Cooke). Soft 

 brown irregular spots appear on the under surface of 

 the leaves, and the upper surface becomes spotted with 

 yellow. The leaves finally shrivel. Most serious in 

 greenhouses. 



Preventive. In houses, keep the temperature as even as 

 possible. In particular, avoid sudden changes. 



Remedy. Sulphide of potassium sprayed on the plants 

 every week or ten days. 



ROT. (Several fungi appear to be concerned in the pro- 

 duction of tomato rot, and the subject is not yet well un- 

 derstood.) 



Preventive. The small cherry and plum tomatoes are 

 not attacked, and the old-fashioned angular sorts are com- 

 paratively free. Training the vines so as to give the fruit 

 plenty of light and air is usually useful. Heavy applica- 

 tions of fresh stable manure appear to augment the injury. 

 Burn all infested vines and fruits in the autumn. 



Verbena. RUST (Erysiphe Cichor ace arum, D. C.). A rust 

 which appears on the leaves, eventually destroying the 

 plants. 



Preventives. Start with perfectly healthy and vigorous 

 stock, and give good culture. In the house, endeavor to 

 avoid drafts, but give plenty of air on bright days. 



Violet. VIOLET DISEASE or RUST (Peronospora Viola, 



