VEGETABLE AND FIELD CROPS 229 



after until transplanted. If the disease develops in the 

 field, the crop should be sprayed with Bordeaux mixture 

 at ten-day intervals. 



To minimize loss during storage no diseased plants 

 should be stored. If storage is imperative, badly infested 

 leaves should be picked off, and in extreme cases the plants 

 should be dipped in a fungicide ^ (ammoniacal copper car- 

 bonate) before they are stored away. 



Leaf spot, phyllostictose {Phyllostida Apii Halst.). — 

 This leaf spot begins as a dull brown patch and never 

 becomes the light ashen color of the cercosporose spot. 

 The spots, too, are not angular, as in the latter disease, and 

 are fewer in number and larger. They usually begin at 

 the leaf edge. In older spots pycnidia are apparent. 



Center blight, soft rot (Bacteria). — A soft, light brown 

 rot of the central bud, sometimes of the leaf or leaf stalks, 

 is characteristic of a disease which is probably bacterial; 

 possibly nearly related to the carrot soft rot. 



Rust (Pucdnia hullata (Pers.) Wint.).^ — This true rust 

 has not yet been destructive in America. It may be 

 recognized from its sori, which resemble those of the as- 

 paragus rust. 



Damping off due to Sclerotinia (see lettuce), Rhizoctonia 

 (see p. 61), and Fusarium have caused much loss in the 

 South. See also p. 63. 



COLLARD 



Black rot. See cabbage. 

 Wilt, bacillose. See cabbage. 

 Club root. See cabbage. 

 Downy mildew. See cabbage. 



