78 AVORCESTER COUNTY HORTICULTURAL SOCIETY. [1891. 



Countess of Oxford, Hippolyte Jamain, and the like, while it is 

 worthy of remark that Mme. Clemence Joigneaux, William 

 Warden, Edouard Morren, and those of the same character of 

 foliage, etc., are seldom subject to these forms of fungoid dis- 

 ease." Cutting off the affected branches and burning them is 

 the best remedy ; cut freely as is done for the hre blight on the 

 pear, but be careful to prevent the rusty powder on the under 

 side of the leaf from being scattered to disseminate the disease, 

 and keep the decaying leaves raked up and burned. 



Black spot on rose leaves is another form of fungus, caused 

 undoubtedly by atmospheric changes. Prof. Humphrey, of 

 the State Agricultural Experiment Station, in Bulletin No. (i, 

 of the Hatch Experiment Station, October, 1889, says: — 



"This is probably the commonest and most troublesome disease 

 of cultivated I'oses, whether of out-door or green-house cultiva- 

 tion, in both Europe and America. It first appears in the form 

 of dark discolorations of the upper surfaces of the leaves, which 

 spread outward and often show a yellow band surrounding the 

 dark spot. The centres of the spot frequently become dry and 

 brown, indicating the complete death of the tissue. The spores 

 germinate promptly on a moist surface, and readily infect fresh 

 leaves. It is probable that this parasite of the rose is merely 

 an imperfect stage in the life history of a fungus. In the lack 

 of definite knowledge on the subject, however, we can deal only 

 with the parasitic form. 



" In combatting the disease it is essential to begin early, 

 for leaves once penetrated by the mycelium of the fungus are 

 irretrievably lost. All effort must be directed towards prevent- 

 ing infection, by the application of some protective compound. 

 For this purpose it is recommended that the bushes be sprayed 

 shortly l)efore the unfolding of the leaves, again as soon as they 

 are fairly opened, and at intervals of three or four weeks until the 

 flowers begin to open, especially after heavy rains, which may 

 wash off the protecting substance from the leaves, with blue-water, 

 prepared as follows : Dissolve 1 pound sulphate of copper in 4 

 gallons warm water; when cool, add 1 pint commercial ammo- 

 nia and 18 gallons of water. Any leaves on which the spots 

 may appear should he promptly cut off and burned." 



In conclusion, my advice to a beginner in rose culture is to 

 plant a few kinds at the start, thoroughly acquaint himself with 

 their character, and gradually plant more ; practical experience 

 is the best guide. 



