Diseases of the Sugar Beet. 



357 



treatment of this disease, and a successful remedy seems to be at 

 hand in the well-known Bordeaux mixture. Numerous fun- 

 gicides were experimented upon, but the Bordeaux mixture has 

 proved most 

 efficient. 



There i s 

 every reason 

 to believe 

 that b}^ be- 

 ginning the 

 sprayings 

 early the 

 leaf- spot 

 may be al- 

 most entire- 

 ly prevented 

 by the use of 

 this fungi- 

 cide. If the 

 disease con- 

 tinues so disastrous as it was in certain sections during the 

 past season, for success growers must expect to spray their beets 

 with the same regularity as has been found necessary in growing 

 potatoes. The standard formula for the Bordeaux mixture 

 should be used, consisting of : — 



Copper sulfate (Blue Vitriol) 6 pounds 



Fresh stone lime (unslaked) 4 " 



Water 50 gallons. 



Dissolve the copper in half of the water used, suspending the 

 crystals in a sack in the water. 



Slack the lime slowly, and then dilute to half the full quan- 

 it}' of water. 



Pour one solution into the other, stirring constantly. Stir the 

 mixture before using. If the potassium ferroc^^anide test is not 

 used, it might be well to add another pound of lime. 



If by further experiment it should be shown that the disease is 

 introduced abundantly by means of the seed, it will be necessary 

 to treat the seed with hot water, copper sulfate solution, or some 



5i. — Mycelium of Cercospora beticola as grown in pure 



culture. 



