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Strong crop, little susceptible to diseases and pests.
Fungi & diseases
Grey brown colored rotten spots on the roots: White mold (sclerotinia).
Wet, rotten spots at the bottom of the stem: Fusarium foot rot (Fusarium solani).
Jerusalem artichokes might be a weed problem. It spreads by rhizomes, and is also self-seeding. Once in the garden it proves difficult to remove. Any tiny piece of the root left in the soil produces new plants.