INSECTICIDES AND PLANT DISEASES 



should be cut out and destroyed. If the garden is kept per- 

 fectly clean and the plants are kept free from dust, planted 

 where there is a proper drainage and cared for in a thorough 

 manner, they will rarely get headway. Most of the sprays 

 for treating fungi depend for effects upon copper or sulphur. 

 For surface mildews nothing is better than sulphur, while the 

 best general fungicide is the Bordeaux Mixture. 



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