90 THE ROSE. 



such places care should be taken not to plant 

 varieties that are known to be specially 

 liable to mildew. As it is contagious, 

 spreading from one plant to another, we 

 should advise the destruction of such sorts 

 as belong to the Giant of Battles type (see 

 chapter on Typical Roses) ; better it is to 

 sacrifice a few kinds than that all should be 

 disfigured with this annoying fungus. Gen- 

 erally mildew makes its appearance in the 

 autumn, when the nights grow cool ; at this 

 season it works but little harm and may be 

 disregarded, since the plants have made their 

 growth and the wood is nearly, or quite, ripe. 

 THE RED SPIDER is a most destructive 

 little insect, which generally commits its 

 ravages in the greenhouse ; they only make 

 their appearance when favored by a hot, dry 

 atmosphere. These insects are very small, 

 scarcely distinguishable by the eye, if iso- 

 lated; they are of a dark, reddish-brown 

 color, found on the under sides of the leaves. 

 They cause the foliage to assume a yellow 

 tinge, and will soon make sickly the plant 

 they infest. A few applications of whale-oil 

 soap dissolved in warm soft water will often 

 destroy them; this can be applied with a 

 syringe, taking care to throw the water up- 

 ward to reach the leaves affected, late in the 



