Cashew Prone to Anthracnose: How to Protect

Anacardium occidentale

Susceptibility: High Severity: High Difficulty: Medium

Anthracnose on Cashew: What to Know?

Anthracnose on Cashew (Anacardium occidentale) is a fungal condition with high severity. Cashew 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...

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

Cashew 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 Cashew can be managed with organic fungicides.

🔍 What Does Anthracnose Look Like on Cashew?

• 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 Cashew?

→ 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 Cashew?

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

TLDR: Prevent Anthracnose on Cashew 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 Cashew to Prevent Anthracnose?

💧 How to Water

Water mature trees every 14 days. Newly planted trees need watering every 3 days for the first 2 months. Avoid waterlogging — roots are sensitive to overwatering. Increase frequency during extreme drought.

☀️ Lighting

Requires full direct sunlight — minimum 6 hours per day. Does not tolerate shade. Best suited for open gardens, rural areas and tropical landscapes with full sun exposure.

🪴 Ideal Soil

Prefers well-draining, slightly acidic soil (pH 5.5–6.5). Tolerates sandy, nutrient-poor soils typical of tropical coastal regions. Add organic compost at planting for better early development.

Frequently asked questions

Can Anthracnose kill my Cashew?

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

How long does Cashew 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 Cashew?

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

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