questions: query about disease problem in cabbage. 
 answers:  two sprays with 2 g/lit copper oxychloride + streptomycin 100-200 ppm solution(0.1 g-0.2 g) after planting and head formation.
or drench the soil with 100-200 ppm(0.1 g-0.2 g) of agrimycin/streptomycin after transplanting.