CHAPTER XV 

 STRAWBERRY DISEASES 



STRAWBERRY-GROWING is often handicapped by pests of one 

 sort or another. Among these the leaf-spot and powdery- 

 mildew, and at times the Botrytis-rot, are important. 

 Growers of strawberries do not rely on spraying alone for the 

 control of their strawberry enemies, but practice sanitation, 

 rotation and cultivation. These measures of eradication are, 

 of course, to be supplemented by protecting the plants with 

 some good fungicide. 



LEAF-SPOT 

 Caused by Mycosphcerella Fragarice (Schweinitz) Lindau 



Perhaps the most common of strawberry diseases is the 

 leaf-spot. It is also called spot disease, sun-burn, sun-scald, 

 leaf-blight, and, erroneously, strawberry rust. These names 

 will recall to the mind of the reader the disease under considera- 

 tion. 



This leaf-spot is found in Europe and America. First studies 

 were made in France in 1865. About 1880 it began to attract 

 more than usual attention in the United States, and for five 

 or six years thereafter complaints of its prevalence and destruc- 

 tiveness came from many parts of this country. While the 

 trouble is now known in practically all parts of the United 

 States, the strawberry-growers of the northeastern quarter 

 of the country are the heaviest losers on account of this disease. 



420 



