DISEASES OF GINSENG. 75 



their Bordeaux to become stale, by mixing days or weeks before 

 using, or they fail to stir the Bordeaux before using, etc., etc 



Bordeaux, if properly made, properly applied, and applied 

 at the proper time, has proven itself to be absolutely effective for 

 controlling Alternaria blight- The writer has used it for years 

 with good results according to the following rules. 



1. Making the Bordeaux of 3-4-50 strength for applica- 

 tions made during the first two or three weeks in the spring, while 

 the foliage is young and tender, and later, when the foliage is old- 

 er, making it of 4-4-50 strength. 



2. Using good stone lime for making the bordeaux. Pre- 

 paringthe Bordeaux by desolving the lime in one vessel and the 

 copper sulphate in another and never mixing the two solutions 

 until just before using. Never mixing more than enough for 

 using that day. Stirring the two solutions briskly before mixing 

 and then taking equal parts of each solution in separate vessels 

 and pouring them simultaneously into a third vessel, which com- 

 pletes the Bordeaux. Stirring the Bordeaux again before putting 

 it into the sprayer and pouring it into the sprayer through a fine 

 brass wire straining funnel. 



3. Using a good sprayer for applying the Bordeaux, one 

 that will throw a fine mist, like a dew. In spraying, be careful 

 to cover all plants, but avoid holding the nozzle long enough in 

 one direction to allow so much of the liquid to fall in one spot to 

 cause it to run together on the surface of the leaves. 



4. Beginning to spray early in spring when the first plants 

 break up through the ground. Spraying often enough to keep 

 the new growth of the plants well covered. 



5. Avoid spraying during cold weather, or the day before, 

 when expecting a frost the following night. 



6. Working all the time on the theory: "Don't discard 

 Bordeaux or the blight will get us."— Author.] 



