352 



CARNATION. 



The cause of this disease is a soil fungus. The plants wilt 

 suddenly. The stem is affected with soft rot at or below the 

 surface of the soil. In the field, change location of the plants 

 frequently; annually, if possible. In the benches, used sterilized 



soil or at least use fresh soil. After transplanting into 



the greenhouse, keep the temperature as low as 



possible until the plants become established. 



Rhizoctonia, 

 stem-rot. 



soil frequently. 

 Bulletin i86. 



Avoid over-watering. See 



Stir the 

 Geneva 



Fusarium, 

 stem-rot. 



Rust. 



This is a dry rot. Plants affected 

 by this disease die slowly, usually 

 a branch at a time. The treatment 

 same as for Rhizoctonia stem-rot. 

 This disease can be recognized by 

 the brown, powdery pustules on the 

 stem and leaves. Plant only the 

 varieties least affected by it. Take cuttings only from 

 healthy plants. Spray (in the field, once a week; in 

 the greenhouse, once in two weeks) with copper 

 sulfate, I lb. to 20 gals, of water. Keep the greenhouse 

 air as dry and cool as is compatible with good growth. 

 Keep the foliage free from moisture. Train the plants 

 so as to secure a free circulation of air among them. 

 See Geneva Bulletin 100. 



Round, grayish spots on the stem and 

 Leaf-spot. leaves are evidences of this disease. 

 Treatment is the same as for rust. 



Cerospora, 

 leaf-blight. 



CELERY. 



This is sometimes known as ''early 

 blight." It often appears in the seed- 

 bed and becomes destructive early 

 in the summer. It is favored by hot 



weather, either wet or dry. Spray with ammoniacal 



copper carbonate, 6-3-45, making about five or eight 



applications beginning while the plants are still in the 



seed-bed. Bordeaux, 5-5-50, may be used for the 



earlier appUcation. Spray ^of ten enough_^to ^keep new Fig. 165. New York apple- 



growths of leaves covered; destroy diseased plants and '''^^ canker. 



refuse. See Cornell Bulletin 132. 



Leaf blight is a fungous disease appearing late in the season. 

 It is often destructive after celery- is stored. The same treat- 

 ment as for "early bUght" is used except that spraying should 

 be continued up to the time the plants are harvested. See 

 Cornell Bulletin 132. Well-drained celery fields, half -shaded do 



not seem to suffer from either blight. 



Septoria, leaf- 

 blight or 

 "late blight." 



