192 



Bulletin 252. 



CARNATION. 



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



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



stem-rot. surface of the soil. In the field, change location of the plants 



frequently; annually, if possible. In the benches, use 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. Stir the 

 soil frequently. Avoid over-watering. See Geneva 

 Bulletin 186. 



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 afifected by it. Take cuttings only from 

 healthy plants. Spray (in the held, 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 too. 



Round, grayish spots on the stem and 

 Leaf-spot. leaves are evidences of this disease. 



Treatment is the same as for rust. f^- 



Fusarium, 

 stem-rot. 



Rust. 



CELERY. 



Cerospora, 

 leaf-blight. 



iw appears in tiie ^'""^^ 

 )ccomes destructive'' 



This is sometimes known as "early 



blight." It often 



seed-bed and b 



early in the summer. It is favored 

 by hot weather, either wet or dry. Spray with am- ' 

 moniacal copper carbonate, 6-3-45, making abtut five 

 or eight applications beginning while the plants are \-.. i 



still in the seeb-bed. Bordeaux, 5-5-50, may be used ^. ^ ,, ,. , 



( ,\ V V ^- c t^ \ ^ Fig. 165. A'ew y ork apple- 



tor the earlier application. Spray often enough to ° '^. . , 



' ^ -^ . 1) ce canker. 



keep new growths of leaves covered ; destroy diseased 

 plants and refuse. See Cornell Bulletin 132. 



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

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

 blight or ment as for "early blight" is used except that spraying should 

 "late blight." he 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. 



