Knowing and Managing Crucifer Pests
NCSU’s Cooperative Extension has created a page which has information on crucifer insects, diseases, physiological disorders, and management practices. Each section offers links to further resources.

Insect Management for Crucifers (Cole Crops) (Broccoli, Cabbage, Cauliflower, Collards, Kale, Mustards, Radishes, Turnips)
University of Florida’s IFAS Extension’s publication on insects; their descriptions, damage, and management options.