Scientific name
              Brevicoryne brassicae 
          Pest image (all)
          
              Cabbage aphids on raceme
Management guide
          
      Description
              Cabbage aphids are soft-bodied and oval or pear shaped with a posterior pair of tubes called cornicles, which project backward. Wingless adult cabbage aphids are 1/10 inches long, oval-shaped and appear grayish-green or grayish-white due to their waxy covering. They prefer feeding on young leaves and flowers. Colonies of aphids are found on upper and lower leaf surfaces, in leaf folds, along the leafstalk, and near leaf axils.
Source of information
              Harsimran Kaur Gill, Harsh Garg and Jennifer L. Gillett-Kaufman, Entomology and Nematology Department, University of Florida: http://entnemdept.ufl.edu/creatures/veg/aphid/cabbage_aphid.htm
          Pest diagnostic image(s)
          
Pest photo source
              Svetlana Micic, Peter Mangano:https://www.agric.wa.gov.au/pest-insects/aphi