602 



Bulletin 283. 



A bacterial disease. Like 

 Blight. the anthracnose, blight is 



carried over in the seed. It 

 is difficult to control. It affects the leaves 

 chiefly, forming large dead spots. Spraying 

 with Bordeaux, as for anthracnose, is said to 

 reduce the injury. Cornell Bulletin 239 and 

 New Jersey Bulletin 151. 



CAB B AGE— CAULI FLO WE R. 



In this bacterial disease, 

 Black-rot. bacteria get into the sap- 

 tubes of the leaves, clog- 

 ging them and turning them black; the plants 

 drop their leaves and fail to head. Practice 

 crop rotation. Soak seed 1 5 minutes in a solu- 

 tion made by dissolving one corrosive subli- 

 mate tablet in a pint of water. Tablets may 

 be bought at drug stores. Geneva Bulletins 

 232 and 251. 



„, , This is a slime mould dis- 



Club-root or 

 club-foot. 



Fig. 212. 



plants. 



ease. The parasite lives in 

 the soil. Practice crop ro- 

 tation. Set only healthy 

 Do not use manure containing cabbage refuse 



Fig. 209. Blight canker of apple. 



If necessary to use in- 

 fested land, apply good stone lime, 2 to 5 tons per acre. Apply at least as early 

 as the autumn before planting; two to four years is better. Lime the seed-bed 

 in same manner. (New Jersey Bulletin 98.) This disease is sometimes confused 

 with cabbage maggots, which see. 



CARNATION. 



This is a dry rot. Plants affected by this disease die slowly, 

 usually a branch at a time. The treatment is same as for 

 Rhizoctonia stem-rot. 



Round, grayish spots on the stem and leaves are evidences of 



this disease. Treatment is the same as for rust. 



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



suddenly. The stem ir 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, use sterilized 



soil or at least use fresh soil. After transplanting into the greenhouse, keep the 



temperature as low as possible until the plant: become established. Stir the soil 



frequently. Avoid over- watering. Geneva Bulletin 186. 



This disease can be recognized by the brown, powdery pustules 



Rust. 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 compat- 



Fusarium, 

 stem-rot. 



Leaf-spot. 



Rhizoctonia, 

 stem-rot. 



