5 common herb diseases

  1. Damping-off. This disease kills seedling roots, leaving them water-soaked and looking shriveled. Provide warm, well-drained seed beds to manage. Can affect Sweet Marojam.
  2. Root rot . This fungus causes rotted, yellowish brown to black roots and underground stems. Outer layers of the root will slough off, leaving a central core. To control, rotate plants every three years and provide with good drainage. Then, promptly remove the diseased plants and follow through with a fall cleanup. May affect lavender, oregano, rosemary and sage.
  3. Downy mildew. Leaves will wither and die after this fungus takes hold. It forms yellow spots on the upper surface of leaves and violet-gray mold on the undersides. To defend, don’t crown plants; cultivate only when plants are dry; and rotate every three years. May affect calendula, coriander, tarragon and basil.
  4. Powdery mildew. This fungus forms white, powdery mold on the upper surfaces of leaves and petioles; foliage then wilts and browns. Promptly remove the diseased plants and follow through with a fall cleanup. May affect bee balm, lemon balm and yarrow.
  5. Over-Watering. causes root rot most often in soils that are periodically waterlogged. Plants growing in soil that is too wet suffer from a lack of oxygen which leads to the death of roots and a loss of vigor in the plant. Stunted slow growth with yellowing leaves is a symptom of over-watering

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