Frangipani with Anthracnose: Prevention & Cure

Plumeria rubra

Susceptibility: Moderate Severity: High Difficulty: Easy

Anthracnose is a fungal disease caused by fungi in the genus Colletotrichum that affects many plants, including vegetables, fruits, and trees. The disease thrives in cool, wet conditions, causing dark, sunken lesions on leaves, stems, flowers, and fruits.

🔍 Symptoms

• Small irregular yellow or brown spots on leaves
• Dark sunken lesions on leaves, stems, flowers and fruits
• Water-soaked lesions that darken as they age
• Pink gelatinous masses of spores in lesion centers during warm, moist weather
• Spots that expand and may cover entire leaves
• Defoliation in advanced stages

❓ Possible Causes

→ Caused by fungi in the genus Colletotrichum
→ Cool wet weather promotes development
→ Optimum temperature between 75-85°F (24-29°C)
→ Foliage wet for extended periods of time
→ Fungi overwinter in seeds, soil and garden debris
→ Spores spread through water droplets

💊 Treatment

⚡

Quick Fixes

Remove and discard all visibly infected parts

Apply commercial systemic fungicide (azoxystrobin or mancozeb)

Adjust irrigation to avoid wetting foliage

Second application of systemic fungicide

Assess treatment effectiveness

🌿

Organic Treatment

Remove all infected plant parts and discard in plastic bag

Apply organic liquid copper spray to all plant surfaces

Switch irrigation regime to drip, avoiding foliage wetting

Second application of copper fungicide or neem oil

Assess progress and remove any new lesions

Final organic fungicide application and ongoing monitoring

🛡️ Prevention

✓ Implement drip irrigation instead of overhead watering
✓ Give plants enough room to breathe and reduce humidity
✓ Remove infected plant material after harvest
✓ Practice crop rotation between hosts and non-hosts
✓ Choose resistant plant varieties when possible
✓ Use western grown seeds not exposed to the disease
✓ Avoid wetting foliage during watering
✓ Ensure good air circulation around plants

🌱 Care Guide: Frangipani

💧 How to Water

Water every 7-10 days during spring and summer, only when the soil is completely dry. During fall and winter dormancy, reduce watering to every 3-4 weeks or stop entirely if the plant drops all its leaves. Overwatering causes root rot rapidly in this species — err on the dry side.

☀️ Lighting

Requires at least 6 hours of direct sunlight per day to flower properly. The more sun, the more blooms. Some afternoon shade is tolerated in extreme heat, but avoid shaded or low-light positions — these will prevent flowering.

🪴 Ideal Soil

Use a well-draining, lightweight mix — a combination of potting soil, coarse sand, and perlite is ideal. Avoid heavy clay soils that retain moisture. Ideal pH is between 6.0 and 7.0.

See more: Frangipani → See more: Anthracnose →