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team-6/backend/storage/plants/diseases.rosemary.md
Tikhon Vodyanov 797fec3135 backend
2025-08-02 13:29:43 +02:00

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Rosemary (Rosmarinus officinalis)

  1. Powdery Mildew (Erysiphe spp.)

    • Integrated Management Strategies:
      • Cultural & Preventive: This is the most important factor. Ensure excellent air circulation by pruning dense growth and providing adequate spacing. Plant in a sunny location. Avoid over-fertilizing.
      • Biological: Some strains of Bacillus subtilis have shown efficacy.
      • Chemical: For edible rosemary, use OMRI-listed products like horticultural oil, neem oil, or potassium bicarbonate. Apply thoroughly, covering all plant surfaces. For ornamental use, systemic fungicides like myclobutanil can be used.

  2. Root Rot (Phytophthora & Pythium spp.)

    • Integrated Management Strategies:
      • Cultural & Preventive: This is almost entirely a cultural problem. Plant in very well-drained soil, such as a sandy loam or a pot with large drainage holes. Amend heavy soils with compost and grit. Water deeply but infrequently, allowing the soil to dry out significantly between waterings. Rosemary is highly drought-tolerant.
      • Biological: Incorporating beneficial microbes like Trichoderma into the potting mix can help suppress root rot pathogens.
      • Chemical: Fungicide drenches are available but will not save a plant with advanced rot. They are best used preventively in nursery settings. Active ingredients include mefenoxam (Pythium) and phosphorous acid (Phytophthora).

  3. Botrytis Blight (Botrytis cinerea)

    • Integrated Management Strategies:
      • Cultural & Preventive: Prune to open up the plant canopy and improve air circulation. Water at the base of the plant in the morning. Remove any dead or decaying plant material immediately.
      • Biological: Bacillus subtilis-based products can be used preventively.
      • Chemical: Check labels carefully for use on herbs. Potassium bicarbonate is an organic option.

(The final two diseases, Aerial Blight and Bacterial Leaf Spot, are less common and are managed with the same principles: improve air circulation and avoid wet foliage.)