Garden Rhubarb with Anthracnose: Prevention & Cure

Rheum x hybridum

Susceptibility: Moderate Severity: High Difficulty: Easy

Anthracnose on Garden Rhubarb: What to Know?

Anthracnose on Garden Rhubarb (Rheum x hybridum) is a fungal condition with high severity. Garden Rhubarb 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...

Garden Rhubarb is a easy-care plant. Recovery from Anthracnose takes approximately 14 days with proper treatment.

Unlike bacterial infections, Anthracnose on Garden Rhubarb can be managed with organic fungicides. Without precautions, chemical treatments for Anthracnose can be harmful to pets. Use organic methods for Garden Rhubarb in pet-friendly homes.

🔍 What Does Anthracnose Look Like on Garden Rhubarb?

• 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 Garden Rhubarb?

→ 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 Garden Rhubarb?

TLDR: Treat Anthracnose on Garden Rhubarb with quick treatment (~7 days) or organic (~14 days). Garden Rhubarb has moderate 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 Garden Rhubarb?

TLDR: Prevent Anthracnose on Garden Rhubarb 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 Garden Rhubarb to Prevent Anthracnose?

💧 How to Water

Water deeply to provide about 2.5-5 cm (1-2 in) of water per week, especially during dry spells in spring and summer. Avoid letting the crown sit in soggy soil, which invites crown rot.

☀️ Lighting

Thrives in full sun (6+ hours daily) for the best stalk production, though it tolerates partial shade in hotter climates.

🪴 Ideal Soil

Use fertile, humus-rich, well-drained soil with a slightly acidic to neutral pH (6.0-7.0). Amend heavy clay with compost or grow in raised beds to prevent waterlogging.

Frequently asked questions

Can Anthracnose kill my Garden Rhubarb?

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

How long does Garden Rhubarb 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 Garden Rhubarb?

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

See more: Garden Rhubarb → See more: Anthracnose →