FIG. 19. GINSENG DISEASES. 



a. Damping off, b.-c. Phytophthora mildew on leaf and root, d. Phytophthora 

 mycelium, e. germination of conidia by means of zoospores, /. germination of conidia 

 by means of germ tubes, g. sexual fertilization of the female oogonium by the male 

 antheridium, h. germinating oospore by means of a germ tube, i. cross section of a 

 root infected with Acrostalagmus showing diseased condition of nbro-vascular 

 bundles, k. fruiting stalks of Acrostalagmus and sclerotia of same, /. cross section of 

 root to show presence of mycelium of Acrostalagmus in vascular bundles, m. papery 

 leaf spot, n. Alternaria. blight on leaf, o. Alternaria spore, p. black rot showing fruit- 

 ing cup of Sclerotinia panacis (d. e. f. g., and h. after Rosenbaum, the other figures 

 after Whetzel and Rosenbaum). 



