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Pest & Disease Control for Horseradish Plants

Every plant has the future potential for disease and insect damage. Factors such as location and weather will play a part in which issues your plants encounters. If available, disease-resistant varieties are the best option for easy care; and for all types of plants, proper maintenance (such as watering, pruning, spraying, weeding, and cleanup) can help keep most insects and diseases at bay.

NOTE: This is part 7 in a series of 11 articles. For a complete background on how to grow horseradish plants, we recommend starting from the beginning.

Imported Crucifer Weevil

Adults are metallic blue black and about 1/10 inch long. White grub like larvae tunnel into the roots and reduce both quality and yield. Eggs overwinter in unharvested roots.

Chemical Control

  • Bonide® Total Pest Control
  • Bonide® Borer-Miner Killer

Horseradish Flea Beetle

Flea beetles are very small, less than 1/8 inch long and feed on the leaf tissue.

Chemical Control

  • GardenTech® Sevin® Concentrate Bug Killer
  • Bayer Advanced™ Complete Insect Killer

White Rust

Appears first as small chlorotic areas on the leaves, then white pustules appear within the areas.

Natural Control

  • Disease free plants

Other Control Options

  • Consult County Extension Agent

Bacterial Leaf Spot

First appears as small dark green, translucent spots that later enlarge and turn black. Usually scattered over the entire surface of the leaf.

Natural Control

  • Disease free plants

Other Control Options

  • Consult County Extension Agent

Turnip Mosaic Virus

Symptoms are ring spots and mosaic or mottling on the leaves. On the leaf stalk black streaks could appear.

Natural Control

  • Plant virus free plants.

Other Control Options

  • Consult County Extension Agent
NEXT: Pruning Horseradish Plants
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