Pests
Aphids: Take into account presence of natural enemies.
Leaf-miners and Pegomyia spp.: Take into account presence of natural enemies. Treatments only in early larval stages to reduce pesticides.
Slugs: Localised treatments with baits.
Nematodes: Where nematodes are a problem use catch crops (e.g. Raphanus) in previous intervals.
Weeds
False/stale seedbed technique recommended.