304 



The Spraying of Plants. 



has put in an appearance. Sulphur has been very generally 

 recommended for its destruction, the application being made 

 either with the dry powder, or after the sulphur has been 

 mixed with water. This remedy has not given uniformly good 

 results out of doors, and a safer plan is to use some of the 

 copper compounds. Carbonate of copper dissolved in ammonia 



FIG. 61. A fresh attack of powdery mildew upon grape foliage. 



is an excellent remedy, and it is easily applied. All parts of 

 the plants should be treated. 



Rattles; Shelling. Description. It frequently occurs that 

 grape-vines drop their berries just as the latter are ripening. 

 The outer extremities of the clusters are first affected. This 

 trouble is primarily caused by defective nutrition of the berries, 

 and, although to a certain extent influenced by the action of 



