Corn Prone to Anthracnose: How to Protect

Zea mays

Susceptibility: High Severity: High Difficulty: Easy

Anthracnose on Corn: What to Know?

Anthracnose on Corn (Zea mays) is a fungal condition with high severity. Corn 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...

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

Corn 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 Corn can be managed with organic fungicides.

🔍 What Does Anthracnose Look Like on Corn?

• 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 Corn?

→ 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 Corn?

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

TLDR: Prevent Anthracnose on Corn 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 Corn to Prevent Anthracnose?

💧 How to Water

Water at the base of the plant to prevent fungal growth on the leaves and ensure deep watering during the summer.

☀️ Lighting

Place in a location with full direct sun exposure; shade drastically reduces grain production and plant vigor.

🪴 Ideal Soil

Use soil rich in nitrogen and organic matter, ensuring it is deep enough for the prop roots.

Frequently asked questions

Can Anthracnose kill my Corn?

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

How long does Corn 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 Corn?

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

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