PLANT ENEMIES AND INSECTICIDES 211 



they are picked and dropped in a pan of water con- 

 taining a little kerosene, early in the morning, when 

 they are still sluggish, they will soon be disposed of. 

 Where this is considered too tedious the plants may 

 be sprayed with either Paris green solution or ar- 

 senate of lead. 



Mildew on roses, sweet peas and other flowers is 

 usually controlled by shaking flour of sulphur over 

 the plants when they are wet with dew. In hot, 

 muggy weather one should not water late in the 

 afternoon plants inclined to mildew. All fungoid 

 diseases indicated by the browning or spotting of the 

 foliage should be handled with a spray of Bordeaux 

 mixture, getting the wash onto every part of the plant 

 and repeating two or three times in the season. 

 Eoses, hollyhock, clematis, foxgloves and many other 

 plants are subject to various fungoid diseases and it 

 is a good plan to spray all plants known to be suscep- 

 tible before the blight appears. 



Aquilegias, asters, cosmos and dahlias are much 

 troubled with a little worm which invades the stalk 

 just below the surface of the soil. In the ease of the 

 aquilegia this is a little pink worm about half an 

 inch long which excavates a nest in the crown of the 

 plant where it changes into a chrysalid and takes 

 its winter nap. Its presence is first detected by the 

 wilting of the top of the plant when it is usually too 

 late to save the plant. If the plant is taken hold of 



