Symptoms
| Leaf blight: Phytophthora sp. Symptoms In its early stages, Phytophthora leaf blight occurs as small dark brown or purple lesions with an amber ooze in the center. Older lesions are zonate with white fuzz of sporangia on the outer edge. Management Hot Water Disinfestations Fallows for Disease Suppression. Isolate plantings (e.g., three small, separate patches instead of one large patch). Prepare the soil well and amend it before planting if calcium, magnesium, or phosphorus are needed. Monitor plant calcium levels by leaf analysis, and maintain calcium at recommended concentrations to prevent development of Pythium corm rot. Add lime material before planting to raise soil pH to 6.0-6.8. Rotate taro with other crops. Incorporate compost and apply surface mulch. Rogue (kill and remove) diseased plants, taking them far from the planting area and destroying them by burying, burning (if allowed), or composting |
- In its early stages, Phytophthora leaf blight occurs as small dark brown or purple lesions with an amber ooze in the center.
- Older lesions are zonate with white fuzz of sporangia on the outer edge.
Management
- Hot Water Disinfestations
- Fallows for Disease Suppression.
- Isolate plantings (e.g., three small, separate patches instead of one large patch).
- Prepare the soil well and amend it before planting if calcium, magnesium, or phosphorus are needed.
- Monitor plant calcium levels by leaf analysis, and maintain calcium at recommended concentrations to prevent development of Pythium corm rot.
- Add lime material before planting to raise soil pH to 6.0-6.8.
- Rotate taro with other crops.
- Incorporate compost and apply surface mulch.
- Rogue (kill and remove) diseased plants, taking them far from the planting area and destroying them by burying, burning (if allowed), or composting