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A?inals of Horticulture, 



The bacterial disease or blight of potatoes is more serious 

 than the old or true rot, because there is no known method 

 of treating it. The most that can be done at present is to 

 practice rotation of crops. The same disease, apparently, 

 attacks tomatoes, and probably some other plants. Much 

 attention is now given to bacterial diseases, and they have 

 been observed in many plants, as in various cucurbits, egg- 

 plant, sweet-potato, potato, tomato, and others. The bac- 

 Bactenai terial blight of the pear has received attention during the 

 p0t rot" year by the Department of Agriculture, and results of eco- 

 nomic importance will soon be published. Bacterial or germ 

 diseases are obscure and serious, and the treatment of them 

 must always be to a great extent strategic. Our increasing 

 knowledge of them enforces another reason for the rotation 

 of crops; and the rotations of the future must alternate im- 

 mune crops with the others. There is indication that in some 

 departments of husbandry these invisible foes will compel us 

 to overturn our present managements. 



