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Pests and diseases

Introduced by accident, "cabbageworms", the larvae of Pieris rapae, are a common caterpillar pest in horseradish. Mature caterpillars chew large, ragged holes in the leaves leaving the large veins intact. Handpicking is an effective control strategy in home gardens. Another common pest of horseradish is the mustard leaf beetle (Phaedon cochleariae). These beetles are undeterred by the defense mechanisms produced by Brassicaceae plants like horseradish.