THE DISEASES OF FRUITS. 



239 



bear the spores. There is a second form of spore produced in 

 spherical thick-walled bodies, designed for preserving the 

 mildew through the winter. These form later in the season 

 than the small naked spores previously mentioned. 



Remedies. — Satisfactory results are obtained from spraying 

 the gooseberry plants, partly because the mildew is upon the 

 surface only. With a similar fungus upon greenhouse roses 

 flowers of sulphur has long been in use, dusted upon the plants 



Fig. 293. -a Leaf of the Strawberry showing the Spot. (From Bailey.) 



or placed upon the heating pipes where it gives o£E fumes. At 

 some Experiment Stations sulphide of potassium has been 

 found effective against the gooseberry mildew, the formula 

 being one ounce to a gallon of water. This is a solution easily 

 made and applied and is a comparatively clear liquid. Good 

 results follow the use of Bordeaux, but this of course tends to 

 coat the fruit. 



The Ground Fruits. 



The Strawberry.— Z^a/ Spot {Sphierella fragarim Tul.) is 

 the most conspicuous and common of the fungous enemies of 

 the strawberry. This causes purple spots upon the leaves, the 



