Hollyhock with Anthracnose? Rare but Treatable

Alcea

Susceptibility: Low Severity: High Difficulty: Medium

Anthracnose on Hollyhock: What to Know?

Anthracnose on Hollyhock (Alcea) is a fungal condition with high severity. Hollyhock has low 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...

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

Unlike most plants, Hollyhock has natural resistance to Anthracnose. Best treated with preventive measures rather than reactive treatment. Unlike bacterial infections, Anthracnose on Hollyhock can be managed with organic fungicides.

🔍 What Does Anthracnose Look Like on Hollyhock?

• 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 Hollyhock?

→ 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 Hollyhock?

TLDR: Treat Anthracnose on Hollyhock with quick treatment (~7 days) or organic (~14 days). Hollyhock has low 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 Hollyhock?

TLDR: Prevent Anthracnose on Hollyhock 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 Hollyhock to Prevent Anthracnose?

💧 How to Water

Water deeply once the top few centimeters of soil dry out, aiming for the base of the plant rather than the foliage - wet leaves encourage rust and fungal disease.

☀️ Lighting

Give hollyhocks at least 6-8 hours of direct sun daily; morning sun is ideal since it dries dew quickly and reduces disease pressure.

🪴 Ideal Soil

Grow in fertile, humus-rich, well-drained loam with a neutral to slightly alkaline pH (6.0-7.5); avoid soggy winter soil, which causes crown rot.

Frequently asked questions

Can Anthracnose kill my Hollyhock?

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

How long does Hollyhock 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 Hollyhock?

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

See more: Hollyhock → See more: Anthracnose →