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Western Australia has many insect and mollusc pests (snails and slugs) that can affect the quality and yield of vegetable brassicas crops.
Cabbage and turnip aphids are relatively minor pests of cabbages in both Indonesia and Western Australia.
The beet cyst nematode is a pest that can cause significant yield loss to brassicas and some other vegetable crops.
Swedes and turnips are members of the brassica family and mainly grown commercially in the South-West of the state, particularly in cooler months.