Blackberry Prone to Anthracnose: How to Protect

Rubus fruticosus

Susceptibility: High Severity: High Difficulty: Medium

Anthracnose on Blackberry: What to Know?

Anthracnose on Blackberry (Rubus fruticosus) is a fungal condition with high severity. Blackberry has high 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...

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

Blackberry is highly susceptible to Anthracnose, unlike most plants in the same family. Without early intervention, recovery takes 21 days instead of 14 days. Unlike bacterial infections, Anthracnose on Blackberry can be managed with organic fungicides.

🔍 What Does Anthracnose Look Like on Blackberry?

• 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 Blackberry?

→ 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 Blackberry?

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

⚡

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 Blackberry?

TLDR: Prevent Anthracnose on Blackberry 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 Blackberry to Prevent Anthracnose?

💧 How to Water

Water deeply once a week, providing 1–2 inches. Increase frequency during hot, dry spells and while fruits are swelling. Reduce watering after harvest. Avoid waterlogging — blackberries are sensitive to root rot in saturated soil.

☀️ Lighting

Requires full sun — a minimum of 6–8 hours of direct sunlight daily. Good light is essential for fruit production and disease prevention. Partial shade produces vigorous canes but significantly reduced fruiting.

🪴 Ideal Soil

Prefers fertile, well-drained loamy or sandy loam soil rich in organic matter. Soil pH should be 5.5–6.5. Incorporate compost or well-rotted manure at planting. Mulch annually to retain moisture and suppress weeds.

Frequently asked questions

Can Anthracnose kill my Blackberry?

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

How long does Blackberry 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 Blackberry?

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

See more: Blackberry → See more: Anthracnose →