CHAPTER IX 



FAMILY ARALIACE^ 



The ginseng is the only plant in this family which 

 is of economic importance. Although not exactly 

 a truck crop, it is nevertheless grown by truckers. 

 The distribution of the crop is limited. According 

 to the Thirteenth Census of the United States, the 

 area devoted to ginseng in 1909 was 23 acres, and the 

 total crop valued at $151,888. The 23 acres are 

 distributed in the following States : New York, Wis- 

 consin, Missouri, Ohio, Pennsylvania, and Michigan. 



DISEASES OF THE GINSENG {Panax 

 quinguefolium) 



Ginseng is subject to numerous diseases, most of 

 which may be kept in check. 



Damping off (Fig. 19 a), see Pythiijm 



Downy Mildew 



Caused by Phytophthora cactorum (C. and L.) Sch. 



Downy nuldew is a destructive disease and is 

 found wherever ginseng is grown. It attacks all 

 parts of the plant, rendering it useless. 



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