THE DISRASES 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 off 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. Leaf Spot (Spharella frag aria Tul.) is 

 the most conspicuous and common of the fungous enemies of 

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



