76 THE ROSE. 



plants should be sprinkled with water so that the 

 substance applied will adhere, or else let it be 

 put on early in the morning while the dew is yet 

 on the plants. Some localities are much more 

 subject to visitations of this disease than others, 

 and in such places care should be taken not to 

 plant varieties that are known to be specially lia- 

 ble 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 Koses) ; 

 better it is to sacrifice a few kinds than that all 

 should be disfigured with this annoying fungus. 

 Generally, mildew makes its appearance in the 

 autumn, when the nights grow cool ; at this sea- 

 son it works but little harm and may be disre- 

 garded, 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 isolated ; they are of a dark, red- 

 dish-brown color, found on the under sides of 



