56 RUST ON GRAPES. 



summer in an aquatic tank, in a steaming atmosphere. 

 Sulphur is a real specific for the pest, where it can be 

 effectually applied from the surface of hot pipes. 

 Injury to the fruit may be apprehended from sulphur 

 put on the flow-pipes if they are made very hot. The 

 constant evaporation of water, with guano stirred into 

 it, from saucers or troughs placed on the hot pipes, has 

 been found to act as a preventive against the attacks 

 of red spider, and at the same time to conduce to the 

 health of any class of plants, whether grown for fruit or 

 flower. It charges the atmosphere of the house with 

 ammonia to the extent of making it something like that 

 of a dung-frame, in which it is well known that insects 

 do not thrive, and all plants requiring heat do. Other 

 sources of procuring a supply of ammonia will suggest 

 themselves to the reader. The atmosphere of the house 

 should, however, never be charged with it to the extent 

 of affecting the eyes of a person, as that of an ill-kept 

 stable does in hot weather, for fear of injury to the 

 plants as well as to insects. 



RUST ON GRAPES. 



This is a disease that makes its appearance on the 

 berries in a few days after they are set ; every grape- 

 grower is too familiar with it to make it necessary I 

 should describe it. Some have said it is caused by 

 handling the berries while thinning them, others by 

 being rubbed with the hair of the thinner's head, others 

 again by cold currents of air. I am not prepared to 

 say but that any or all of these causes will produce 

 rust; but I am certain that the most fertile source of 



