ASCOMYCETES 



225 



Following a moist early summer I have found the perithecia abun- 

 dant on old leaves in the shade during a very dry period in late- 

 summer (Fig. 90). 



Control. Thorough dusting with ilowers of sulfur every ten days 

 is often sufficient. Ammoniacal copper carbonate is also effective. 



Kid. 90. KDSK Mll.DKW, I'KKITHKCIA PRESENT 



Sulfuric acid i to 1000 has recently been recommended. No ex- 

 periments have been reported respecting the use of the " self- 

 cooked " lime-sulfur for the rose mildew, but there is reason to 

 believe that it may be far more effective than sulfur in this ease. 



