GOOSEBERRY LEAF MILDEW 95 



treating this disease with a solution made hy dissolving 

 half an ounce of potassium sulphide to the gallon of water, 

 The preparation is cheap, and can be quickly and effec- 

 tually applied with any of the well-known spraying pumps. 

 The greatest care should be exercised in making the second 

 spraying, which, by the way, should be at the same time 

 as that mentioned for the flowers of sulphur, in order to 

 protect the blossoms from the fungus.' 



Berkeley, Gard. Chron., Nov. 27, 1847. 

 Scribner, U.S. Dept. Agric, Bull. 11. 



GOOSEBERRY LEAF MILDEW 



{Microsphaera grossulariae, Lev.) 



During certain seasons the leaves of gooseberries are 

 more or less covered on the upper surface with a very 

 delicate, whitish, powdery-looking mildew. When the 

 mycelium is well established on the leaf, numerous erect 

 chains of conidia appear. Later in the season perithecia 

 are produced, at first yellow, finally blackish, which contain 

 resting spores produced in asci in their interior. The 

 appendages of the perithecia are branched in a compli- 

 cated manner at the tip. 



Preventive Means. — Spray with potassium sulphide 

 solution, commencing first when the leaves are unfolding. 



HOP MILDEW 



{Sphaerotheca castagnei, Ldv.) 



This scourge of hop-fields is also parasitic on numerous 

 wild plants belonging to various Orders. It first appears 



