HOSE GROWING IN WINTER. 173 



Cornelia Cook (white), La France (light rose), Coquette 

 des Alpes (pure white), Madame Welch (blush), Duchess 

 of Edinburgh (crimson), Malmaison (deep blush), Cath- 

 erine Mermet (rosy pink), Letty Coles (carmine and 

 blush), Devoniensis (deep blush), Sunset (the new orange 

 saffron variety), Dinsmore (scarlet crimson), The Puritan 

 (white), American Beauty (deep crimson), and Bride 

 (pure white), all of which, under proper conditions, will 

 give perfect flowers in the hottest weather. 



THE DISEASES AND INSECT PESTS AFFECTING ROSES 



Have been in part referred to in the Cultural Direc- 

 tions. Mildew, the most common, quickly succumbs to 

 sulphur, if applied as directed in chapter on Insects and 

 Diseases Affecting Plants. The aphis, or Green-fly, 

 should never appear, if preventive measures have been 

 taken with tobacco, as directed in the same Chapter. 



But there are other pests encountered in Rose growing 

 not so easily got rid of. The Red-spider, the insect so 

 small as hardly to be seen by the naked eye, that works 

 on the under side of the leaves, giving them a dry and 

 reddish appearance, luxuriates in a dry, hot atmosphere, 

 but persistent forcible syringing in the forenoon, when 

 the sun is shining, will generally keep it down ; care 

 should be taken, however, to thin out all weak, useless 

 wood, so that the syringing can take effect on the leaves 

 affected by the spider. 



For the remedy for the Rose-bug, see Chapter on 

 Insects, etc. 



The Black Spot, so called for want of a better name, 

 is a disease most injurious in its effects on roses, particu- 

 larly the Hybrid Perpetual and Hybrid Tea classes. 

 There is quite a difference of opinion about this disease 

 of the Rose, some contending that it is altogether atmos- 

 pheric, others that it is solely caused by the destruction of 

 the working roots. Certain it is, that it is first caused 



