CA RNA TION CHERR Y 267 



Carnation. RUST ( Uromyces caryophyllinus) . Produces brown, pow- 

 dery pustules on stems and leaves. 



Control. Take cuttings only from healthy plants. Pick off 

 diseased leaves. Spray once in two weeks with a solution of 

 copper sulfate, 1 pound to 20 gallons. Keep water from leaves, 

 and grow the plants at as low temperature as is compatible with 

 best development. 



STEM-ROT (Rhizoctonia and Fusarium). The former produces a 

 sudden wilting of the plant, and the stems are soon dead and dry. 

 The latter produces a slow rot of the heart, one branch dying at 

 a time. The treatment is the same. 



Control. In the field change the location every year. In the 

 greenhouse sterilize the soil with steam. 

 Cauliflower. See under CABBAGE. 



Celery. EARLY LEAF-BLIGHT (Cercospora apii). A spotting and 

 eventual blighting of the leaves early in the summer. Begins in 

 the seed-bed. It is favored by hot weather, either wet or 

 dry. 



Control. Spray with ammoniacal copper carbonate, 5-3-50, 

 beginning in the seed bed and keeping the new growth covered 

 throughout the season. 



LATE BLIGHT (Septoria petroselini var. apii). A fungous disease, 

 appearing late in the season, causing a blight of the foliage, and 

 often destructive after the celery is stored. 



Control. As above, except that spraying should be continued 

 up to harvesting time. In either case, the disease is practically 

 controlled by growing the plants under half shade. 

 Cherry. BROWN-ROT (Sclerotinia fructigena) . Attacks flowers, leaves, 

 and fruit. The flowers die and decay, the leaves become discolored 

 with irregular brown spots, and the fruit rots on the tree. Attacks 

 also peaches, plums, and apples. 



Control. Spray with bordeaux mixture, 4-4-50, or lime-sulfur, 

 1-40, (a) just before the blossom buds open; (fc) just after the 

 blossoms fall; (c) make one or two more applications at intervals 

 of ten days. 



LEAF-RUST. See under PLUM, p. 279. 



POWDERY MILDEW (Podosphwra oxycanthce). Attacks leaves and 

 twigs, often causing defoliation. Serious on nursery stock. Spray- 



