Blueberry with Anthracnose: Prevention & Cure

Vaccinium sp

Susceptibility: Moderate Severity: High Difficulty: Medium

Anthracnose on Blueberry: What to Know?

Anthracnose on Blueberry (Vaccinium sp) is a fungal condition with high severity. Blueberry has moderate susceptibility to this disease. 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...

Blueberry is a medium-care plant. Recovery from Anthracnose takes approximately 14 days with proper treatment.

Unlike bacterial infections, Anthracnose on Blueberry can be managed with organic fungicides.

🔍 What Does Anthracnose Look Like on Blueberry?

• 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

❓ What Causes Anthracnose on Blueberry?

→ 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

💊 How to Treat Anthracnose on Blueberry?

TLDR: Treat Anthracnose on Blueberry with quick treatment (~7 days) or organic (~14 days). Blueberry has moderate susceptibility to this disease.

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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

🛡️ How to Prevent Anthracnose on Blueberry?

TLDR: Prevent Anthracnose on Blueberry with 8 essential preventive care practices.

✓ 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

🌱 How to Care for Blueberry to Prevent Anthracnose?

💧 How to Water

Water every 2–4 days during the growing season, maintaining consistently moist soil. Blueberries have shallow roots and are sensitive to drought stress. Avoid waterlogging as it promotes root rot. During winter dormancy, reduce watering significantly.

☀️ Lighting

Blueberries require full sun—at least 6–8 hours of direct sunlight per day—for optimal fruit production. Partial shade is tolerated but significantly reduces flowering and fruiting. Place in the sunniest location available in your garden.

🪴 Ideal Soil

Plant in acidic soil with a pH of 4.0–5.5. Use a peat-based mix enriched with organic matter. Avoid alkaline or compacted soils. If native soil is not acidic enough, amend with elemental sulfur or use raised beds filled with a blueberry-specific mix.

Frequently asked questions

Can Anthracnose kill my Blueberry?

Yes, without treatment, Anthracnose can be fatal to Blueberry. Early detection and treatment are key.

How long does Blueberry take to recover from Anthracnose?

With proper treatment, recovery takes approximately 14 days. Without treatment, it can take significantly longer.

Is Anthracnose contagious to other plants near Blueberry?

Yes, Anthracnose can spread to nearby plants. Isolate the affected Blueberry immediately.

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