vi.] GREENFLY CANKER POTATO BLIGHT 37 



The process of "scrunching" the Rose grub is to 

 some people disagreeable, but it is inevitable. 



The cause of Canker in apple-trees and secretion of 

 gum in plum-trees is most frequently fungus. When 

 such symptoms appear the branches should be cleaned 

 and pruned, the subsoil roots cut back, and fresh soil 

 thrown in, with a liberal supply of liquid manure. 



The Potato disease, too, has been proved to be a 

 fungus growth, and the system of spraying the potato 

 crop for the prevention of disease has had most satis- 

 factory results both in the farm and garden. 



The spraying mixture most frequently used both in 

 France and in the United Kingdom is that known as 

 the Bordeaux Mixture ; for \ acre the quantities are : 

 copper-sulphate 5 Ibs., lime 5 Ibs., and water 25 gallons. 

 There is another called the Burgundy Mixture, consist- 

 ing of copper-sulphate and soda, which adheres better to 

 the leaves, if applied as soon as prepared and not 

 given time to deteriorate, and it also runs more freely 

 through the nozzles of the sprayer. 



It should be first applied some little time before 

 the disease usually makes its appearance in the neigh- 

 bourhood. This in early districts would be during the 

 first week in June. But even after the first traces of 

 the fungus are observed a dressing will have excellent 

 results. Within three or four weeks much of the stuff will 

 have been washed off by the rain, and much additional 



