37 



found favour with many. According to experiments carried out at the 

 College, it would seem that lime-sulphur is better than either potassium 

 sulphide or Bordeaux. Best results were obtained with commercial lime 

 sulphur diluted 1:20. This dfd not injure the foliage. Three sprayings 

 were found advisable, the first early in April, the second early in May, 

 and the third early in June. Where a hydrometer is pbtainable a safe 

 practice is to spray shortly before the buds burst with the fungicide of 

 1.030 sp. gr. A second spraying should be given just before the blossoms 

 appear with the fungicide of 1.009 sp.gr., and a third spraying of the 

 same strengtii just after the fruit is formed. 



ROSE MITvDEW (Sphaerotheca pannosa). This is very troublesome 

 on roses grown in the greenhouse or in shady situations. The fungus 

 causes the leaves to curl and so their function is interfered with. 



Control. Thoroughly dust with powdered sulphur every ten days, 



or as often as necessary. Ijme sulphur is recommended by some, also Am- 

 moniacal Copper Carbonate. 



APPLE AND CHERRY MILDEW (Podospbaera oxyacantbae). 



This is found on a large number of rosaceous and other plants, apples, 

 pbims, thorn apples and cherries being the most common ones attacked. 



It is placed among the destructive diseases because it frequently dots 

 harm to apple nursery stock and to cherry. 



Bordeaux mixture 4-4-40 will keep it in check. 



Powdery Mildew of Gooseberry (Sphaerotheca mors-uvne) a. resting spore ca.se discharging 

 its single spore sac (ascu!;) b. which contains H winter spores. 



