slug arion vulgaris snail spanish parasitizes kohlrabi cabbage turnip gongylodes moves garden field, eating ripe plant

agriculture arion brassica brownish cabbage closeup crops czech damage dangerous detail disposal eating enemies enormous europe farm farming field garden gongylodes granules iberian invasive kohlrabi lactuca land molluscicides moves moving native oleracea overgrowth overpopulation parasites parasitic parasitizes peninsula pest pesticides plant poison ripe sativa slug snail spain spanish turnip vulgaris