Downy mildew 2-3 year crop rotation. Rotating to non-cruciferous crops may reduce pathogen populations and increase fungicide efficacy. Plant disease resistant broccoli varieties. Second and third applications may be required and should be applied at 14 day intervals. Fusarium yellows Plant yellows-resistant varieties.
Many resistant varieties are available.
Seed contamination Use 1 oz. Captan 50WP per 100 lb. of seed. Most seed companies distribute treated seeds. Hot water treatment is important to help prevent black leg and black rot. Wirestem Apply Terrachlor 75W to seedbeds at 4 to 8 oz.