- 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.
- 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.
- 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.
- 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.
- 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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