📈 Diseases of Spice and Plantation Crops
Diseases of Spice and Plantation Crops.
Spice and plantation crops are long-duration, high-value systems where disease outbreaks can reduce yield for multiple seasons. Quick identification and integrated management are critical for stable production.
Black Pepper — Quick Wilt (Foot Rot)
Causal organism: Phytophthora capsici
Symptoms
- Rapid wilting and death of vines during monsoon season
- Black rotting of stem base extending upward; roots turn black
- Leaf yellowing followed by shedding
- Berries turn black and drop prematurely
Management
- Improve drainage around vines; avoid waterlogging
- Apply Metalaxyl-Mancozeb (0.2%) as soil drench at onset of monsoon
- Soil application of Trichoderma harzianum (50 g/vine)
- Phytosanitary measures — remove and destroy affected vines
Cardamom — Katte Disease (Mosaic)
Causal organism: Cardamom mosaic virus (transmitted by aphid Pentalonia nigronervosa)
- Green mosaic streaks on young leaves
- Stunted growth and reduced capsule yield
- No cure — rogue infected plants, control aphid vectors, use virus-free planting material
Coconut — Bud Rot
Causal organism: Phytophthora palmivora
Symptoms
- Rotting of unopened spindle leaf in the crown
- Foul-smelling, brown, slimy decay of the growing point
- If untreated, palm dies as the single apical meristem is destroyed
Management
- Remove rotted tissue and apply Bordeaux paste to wound
- Pour Metalaxyl solution into crown during monsoon
- Ensure adequate drainage around palm base
Arecanut — Koleroga (Fruit Rot)
Causal organism: Phytophthora meadii
- Water-soaked lesions on developing nuts during monsoon
- White fungal growth on nut surface; premature nut fall
- Spray Bordeaux mixture (1%) before and during monsoon
Tea — Blister Blight
Causal organism: Exobasidium vexans
- Circular, translucent blisters on young leaves
- Blisters become white and velvety on underside (basidiospores)
- Severe infection distorts and curls leaves; reduces tea quality
- Spray Copper oxychloride (0.25%) or Hexaconazole (0.01%) at 7–10 day intervals
Coffee — Coffee Rust
Causal organism: Hemileia vastatrix
- Orange-yellow powdery pustules on underside of leaves
- Severe defoliation leading to "die-back" of branches
- Historically devastated coffee plantations worldwide
- Spray Bordeaux mixture or systemic fungicides (Propiconazole)
Summary Cheat Sheet
| Crop | Major Disease | Hallmark Symptom | Core Management |
|---|---|---|---|
| Black pepper | Quick wilt (Phytophthora capsici) | Rapid vine wilt in monsoon | Drainage + Metalaxyl-Mancozeb + sanitation |
| Cardamom | Katte mosaic virus | Mosaic streaking and stunting | Rogueing + aphid control + clean planting stock |
| Coconut | Bud rot (Phytophthora palmivora) | Rotting spindle leaf and crown decay | Crown treatment + drainage |
| Arecanut | Koleroga (Phytophthora meadii) | Nut rot and premature nut fall | Timed Bordeaux sprays |
| Tea | Blister blight (Exobasidium vexans) | Translucent leaf blisters | Regular copper/systemic sprays |
| Coffee | Rust (Hemileia vastatrix) | Orange pustules on leaf underside | Protective fungicide program |
References
2 sources • [1] [2]
References
[2]
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