NURSERY STOCK 



103 



takes place, however, a close examination of the dis- 

 eased spots will reveal numerous little black specks , 

 these contain the spores or reproductive bodies of the 

 fungus, which escape by rupturing the cuticle of the 



Spraying for Plum Leaf blight 



(After Galloway) 



leaf with which they are covered. Under proper con- 

 ditions of moisture and heat the spores germinate, and 

 if this takes place on a pear leaf, the germ tube bores 

 its way into the tissues, soon develops into colorless 

 filaments, like those already described, and these in 



