252 



Club-root is controlled by growing the young plants in beds not in- 

 fected and in using a rotation without crucifers other than cabbage. 



Black Mold 

 Caused by Alternaria hrassicac (Berk.) Sacc. 



Black mold, or black leaf-spot, appears chiefly as round black spots 

 often marked with concentric brown rings on the lower leaves of the 

 plant. 



This disease is not often serious in the field. It was reported by the 

 Bureau of Markets to have caused some damage to cabbage heads shipped 

 from Illinois in 1921. It has been found on field cabbage in Knox, Alar- 

 ion, Pulaski, and Alexander counties, which indicates a wide range over 

 the state. Northern infections appear less severe than southern. 



Miscellaneous Dise.\ses 



Two leaf diseases of cabbage which are of minor importance have 

 been found in Illinois. One, commonly called' "ring spot", caused by 

 Mycosphacrclla brassicicola (Duby) Lindau, was found in Pope county 

 in 1933 ; the other, a leaf spot caused by Ccrcospora bloxami B. & Br., 

 was found in Pope county in 1932 and in Alexander county in 1923. 



Cauliflower 



The growing of cauliflower is of some importance in the trucking 

 areas of the state. In general, this crop is subject to the same diseases 

 as is cabbage, though in Illinois black rot is the only one thus far seen. 

 It has been found in Peoria county, where from 5 to 30 per cent of the 

 plants were infected, and in Cook county in the south Halsted district, 

 where from 1 to 10 per cent of the plants were infected. 



Measures of control are described under cabbage. 



Bean 



In trucking areas bean-growing is of some importance, and local 

 gardeners usually cater to the needs of markets. 



Anthracnose 

 Caused bv CoJlctotrichum Undcmutbiaiiutn (S. & M.) B. & C. 



.Anthracnose of bean is especially destructive. It appears as a spot 

 on the leaves, stems, and pods. It is most injurious on the pods, where 

 it forms a round, sunken, rust-colored spot with a reddish border. 



The first report of this disease in Illinois was made by C. E. Durst, 

 who found it in 1912 injuring 20 per cent of the crop near Anna. Union 



