DISEASES OF GINSENG. 71 



II. Eradication of the Fundus after it once becomes 

 established in the Garden, is practically impossible. Sanitary 

 measures, such as the removal aod destruction of diseased tops, 

 burning over the beds in autumn, or spraying the surface with a 

 strong copper sulphate solution, will doubtless materially assist in 

 holding the fungus in check. They cannot be relied upon alone, 

 to prevent losses when conditions favorable to the parasite occur. 

 Of the various sanitary measures thus employed, that of covering 

 the beds, after the tops die down, with a layer of dry straw and 

 burning is most to be recommended. Where this is not feasible 

 for any reason, copper sulphate solution (not bordeaux), one pound 

 to five or ten gallons of water, may be applied after the tops and 

 mulch are removed. Enough should be applied to wet the soil to 

 the depth of half an inch. 



III. Protection of the Plants from Infection by the Alter- 

 nana Fundus, offers the most satisfactory means of controlling 

 the malady. Proper locations, so as to afford good ventilation, 

 setting the plants farther apart, etc-, all conduce to the rapid evap- 

 oration of moisture, and this, to a degree, protects the plants from 

 infection, since, as we have seen, the spores require continuous 

 moisture for several hours to insure germination and penetration 

 of the host. These are of relatively little value during a rainy 

 period continuing for several days. By far the most efficient 

 means of protecting the plants, and thus controlling the disease, is 

 the practice of spraying. Success in spraying depends upon strict 

 adherence to the following rules: 



1. The spray mixture to be used must have proven fungi- 

 cidal efficiency against the spores of the fungus to be combated. 

 Bordeaux mixture 3-3-50 has been proven, both by careful labora- 

 tory tests and on the plants, to be entirely effective against this 



