Volunteer oilseed rape

Brassica napus

Importance

A problem wherever oilseed rape is grown. Can be difficult to control in many situations, especially in vegetable brassicas.

Volunteer oilseed rape - young1. Kidney-shaped cotyledons usually blue-green in colour, often with a reddish or purplish tinge.
Volunteer oilseed rape2. First leaves oval in shape with shallow indentations along edges. Later leaves are waxy and long and increasingly notched or irregular

 

Volunteer oilseed rape - mature3. Mature plant very familiar, particularly when in flower.