Thorny Olive with Southern Blight: Prevention & Cure

Elaeagnus pungens

Susceptibility: Moderate Severity: High Difficulty: Easy

Southern Blight on Thorny Olive: What to Know?

Southern Blight on Thorny Olive (Elaeagnus pungens) is a fungal condition with high severity. Thorny Olive has moderate susceptibility to this disease. Southern blight is a devastating soilborne fungal disease caused by Athelia rolfsii (formerly Sclerotium rolfsii), affecting over 500 plant species including vegetables, ornamentals, and fruit crops....

Thorny Olive is a easy-care plant. Recovery from Southern Blight takes approximately 21 days with proper treatment.

Unlike bacterial infections, Southern Blight on Thorny Olive can be managed with organic fungicides.

🔍 What Does Southern Blight Look Like on Thorny Olive?

• Brown to black lesions on stem near soil line
• Water-soaked appearance on lower leaves
• Sudden and permanent wilting of entire plant within days
• White mycelium radiating from plant base onto soil surface
• Spherical tan to reddish-brown sclerotia (1-2mm)
• Yellowing and necrosis of foliage
• Crown and root rot
• On fruits: sunken yellow lesions turning water-soaked

❓ What Causes Southern Blight on Thorny Olive?

→ Soilborne fungus Athelia rolfsii surviving through sclerotia
→ High temperatures (25-30°C / 77-95°F)
→ High soil moisture and relative humidity above 90%
→ Acidic soil (pH below 7, especially pH 2-5)
→ Spread through infested soil and plant debris
→ Contaminated tools, irrigation water, and transplants
→ Contaminated mulch or compost
→ Plant stress and stem injuries

💊 How to Treat Southern Blight on Thorny Olive?

TLDR: Treat Southern Blight on Thorny Olive with quick treatment (~11 days) or organic (~21 days). Thorny Olive has moderate susceptibility to this disease.

⚡

Quick Fixes

Step 1

Remove infected plants IMMEDIATELY with roots and soil

Step 2

Apply azoxystrobin drench to adjacent plants

Step 3

Spray mancozeb on base of all plants in area

Step 4

Drastically reduce irrigation

Step 5

Reapply fungicides every 7-10 days for 3 weeks

🌿

Organic Treatment

Step 1

Remove diseased plants and 3 inches of contaminated soil

Step 2

Solarize area with clear plastic for 6 weeks

Step 3

Incorporate compost rich in Trichoderma

Step 4

Adjust soil pH with lime

Step 5

Improve drainage and plant spacing

Step 6

Apply preventive bicarbonate spray biweekly

🛡️ How to Prevent Southern Blight on Thorny Olive?

TLDR: Prevent Southern Blight on Thorny Olive with 10 essential preventive care practices.

✓ Carefully inspect transplants for sclerotia before planting
✓ Avoid planting in fields with history of infestation
✓ Maintain soil pH above 7 (lime reduces sclerotial germination)
✓ Improve plant spacing to increase airflow
✓ Use high-quality mulches from reputable suppliers
✓ Rotate with non-host crops (corn, wheat, barley) for 2-3 years
✓ Avoid overwatering and excessive soil moisture
✓ Disinfect tools between plants
✓ Deep plow (8-12 inches) to bury sclerotia
✓ Remove symptomatic plants and weeds immediately

🌱 How to Care for Thorny Olive to Prevent Southern Blight?

💧 How to Water

Once established, water every 14 days or only during prolonged droughts. The shrub is highly drought-tolerant and prefers to dry out between waterings. Avoid waterlogging.

☀️ Lighting

Prefers full sun (6+ hours per day) but tolerates partial shade. More sunlight produces denser, more vigorous growth. In heavy shade, growth may become sparse and slow.

🪴 Ideal Soil

Adapts to a wide range of soil types: sandy, clay, or loam. Good drainage is essential. Prefers a pH of 6.0–7.5. Tolerates poor and compacted soils.

Frequently asked questions

Can Southern Blight kill my Thorny Olive?

Yes, without treatment, Southern Blight can be fatal to Thorny Olive. Early detection and treatment are key.

How long does Thorny Olive take to recover from Southern Blight?

With proper treatment, recovery takes approximately 21 days. Without treatment, it can take significantly longer.

Is Southern Blight contagious to other plants near Thorny Olive?

Yes, Southern Blight can spread to nearby plants. Isolate the affected Thorny Olive immediately.

See more: Thorny Olive → See more: Southern Blight →