INSECTS, DISEASES AND SPRAYING 65 



used to cover the bed where roses are growing. 

 As it matures a dark oval ball or sac is pro- 

 duced filled wich spores. This black sac is 

 supported upon a swollen stalk rising from 

 the surface of the manure, and when ma- 

 ture the enlarged portion, filled with liquid, 

 suddenly forces off the spore sac and collapses, 

 throwing the ball of spores into the air. These 

 dark spore sacs are covered with moisture 

 as they are discharged and will adhere 

 to any object which they may strike in their 

 flight. 



The height to which the dark sacs are 

 thrown is fully ten feet; but there is a rapid 

 falling off in the number upon any given 

 area when the height of two or three feet is 

 reached. 



These specks, of course, may be upon any 

 plant that is within range; but they do no 

 further harm than the disfigurement thereby 

 produced. They are more often met with in 

 rose houses, because there the manure is 

 more frequently left upon the surface than 

 with other kinds of plants. 



This extensive list of things which are pos- 

 sible sources of trouble to the rose grower, 

 should not be regarded entirely as a barri- 



