58 DISEASES OF GINSENG. 



ment: Thorough spraying with Bordeaux Mixture of a 3-3-60 

 strength, as a preventive, and the careful removal of all affected 

 tops. 



2. Affecting older plants. 



A. Leaves become spotted. At first, the spots look like 

 oiled silk, or as if caused by a drop of boiling water. Watery, 

 then finally dry and papery, becoming yellowish. Where the 

 disease is bad, the tops go down as if dashed with boiling water. 

 * * * ALTERNARIA LEAF BLIGHT, or LEAF SPOT. 

 Treatment: Same as for top blight of seedlings. 



B. Leaves Ijecoming colored prematurely, reddish or yel- 

 lowish. Stem breaking loose from the crown easily. Stem, on 

 close examination, showing a long sunken brown spot somewhere 

 along its length, or, in first stages of the disease, only a yellowish 

 discolored spot. * * * STEM ROT. Another manifestation 

 of the Alternaria fungus. Treatment: Thorough spraying with 

 Bordeaux Mixture early in spi'ing and thi'oughout growing season 

 as a preventive. Careful I'emoving from garden of all dead and 

 affected stems. Thorough sprinkling of beds and paths late in fall 

 and early in spring with copper sulphate solution, one pound to 

 ten gallons of water. 



C. Seeds on the seed ball, when nearly fully grown, show- 

 ing yellow spots, begin to shiivel and fall away easily. * " * 

 SEED BLAST. Due to Alternaria. Treatment: Thoroughly 

 spraying the seed Ijalls with Bordeaux Mixture during the deve- 

 loping period of the seed berries. 



D. Leaves suddenly wilting. Stem soft and watery at 

 some point along its length. * * * BACTERIAL BLIGHT. 

 No published account. Treatment: Better ventilation. 



