The main symptom of the Cabbage Root Fly pest is stunted growth
especially if infected as seedlings. Discoloured leaves which wilt. Roots
are black and rotten.
symptoms of Cabbage Root Fly are caused because the roots are unable to function in their
normal way. The disease is caused by maggots of the Cabbage Root Fly
munching their way through the roots of the plants.
The flies are most common in spring but they multiply so rapidly that they
also appear in the summer and autumn. In good conditions (for Cabbage Root Fly
anyway!) three generations can be produced in a single year.
Treatment of Cabbage Root Fly is only by the spraying of chemicals, there
are no known organic treatments. Either treat with chemicals or dig up all
affected plants and burn them. Treatment with chemicals will not undo all the
damage and reduced crops will result. We do not advise treating cabbage root
fly with chemicals.
of Cabbage root Fly can be achieved by placing a 15cm (6 in)
diameter collar of carpet or underlay around each plant. This will prevent
the fly from laying eggs on the soil near the plant. Lots of other
materials can also also be used as a collar. Thick cardboard works well as
does most materials which do not rot too quickly.
Burn all infected plants and do not
plant brassicas on the same site for three years.
TO THE GARDEN PEST AND DISEASE MAIN PAGE FOR
PESTS AND DISEASES CLASSIFIED BY PLANT