K-2 DISEASES OF ECONOMIC PLANTS 



currant, celery, radish, rhubarb. Asparagus Sprengeri, 

 aster, carnation, sweet wiUiam, coreopsis, violet, cherry, 

 pine, cucumber, begonia, coleus, verbena, hydrangea, 

 candytuft, sage, phlox, pyrethrum, snapdragon, raspberry, 

 lambs'-quarters, tumble-weed, pigweed, and squash, while 

 in Europe it is known upon many more species of plants. 

 If conditions favorable to its attack obtain, the fungus may 

 well be expected upon almost any species of plant, so wide 

 is its range of hosts. For complete description see potato, 

 p. 271. 



Soil disinfection, when practicable, may be employed; 

 otherwise general sanitary measures, destruction of infec- 

 tive refuse, and the use of resistant plants are remedial. 



Sclerotiose (Sclerotium Rolf.sii Sacc). — The chief symp- 

 toms of this disease, with treatment, are described under 

 pepper, p. 259. The causal fungus seems almost omnivorous, 

 and may be recognized upon numerous hosts in the southern- 

 most states. It has been identified upon tomato, eggplant, 

 Irish potato, sweet potato, beet, peanut, bean, cowpea, cab- 

 bage, squash, watermelon, rhubarb, fig, cotton, \iolet, 

 hydrangea, daphne, chrysanthemum, cantaloupe, morning- 

 glory, carrot, Japanese fiber plant, grasses, cauUflower, 

 sugar cane, and several weeds. 



Texas root rot, Ozoniose. — Most destructive to cotton 

 under the name of the Texas root rot (see p. 401) this 

 disease affects a very \vide range of plants in regions 

 where the causal fungus exists. The disease has been re- 

 ported from Texas, Oklahoma, New Mexico, and Arizona. 

 It has been noted upon nursery stock (except Prunus), 

 apple, mulberry, china berry, persimmon, elm, lime, maple, 

 Sida spinosa, ragweed, cocklebur, and alfalfa, 



