SMALL FRUITS 



181 



STRAWBERRY 



Leaf spot {Sphaerella fragarix (Tul.) Sacc). — The most 

 conspicuous disease of the strawberry, one nearly al- 

 ways present to some extent on both wild and culti- 



FiG. 78. — Strawberry leaf spot. After Freeman. 



vated varieties, is known by the presence of small 

 4-6 mm. purple or red bordered spots upon the leaves, 

 the older spots bearing white or ashen centers. Late in 

 the development of the spots the hyphae of the causal 

 fungus are barely visible in these centers with a good hand 

 lens. The spots, when numerous, may coalesce, forming 



