Schefflera (Brassaia) Disease Guide: Fungal, Bacterial, and Environmental Disorders

Managing Diseases and Disorders in Schefflera Production

Schefflera (umbrella tree) faces fungal and bacterial leaf spots, cold injury, and light-related disorders. The large, palmately compound leaves that define this genus are vulnerable to several foliar pathogens and environmental stresses.

Alternaria Leaf Spot

Alternaria panax causes large dark brown leaf spots, sometimes with yellow halos.

Management: Avoid overhead watering. Apply protective fungicides.

Bacterial Leaf Spot

Xanthomonas campestris pv. hederae causes small tan/yellow corky irregular spots on lower leaf surfaces (up to 1/4 inch), turning dark brown.

Management: Purchase disease-free plants. Avoid overhead watering. Check nearby English ivy for bacterial leaf spot. Remove infected plants.

Cold Injury

Dead leaf areas forming up to several days after exposure to temperatures below 50°F.

Management: Don't place near air conditioners. Maintain temperatures above 50°F.

Leaf Yellowing

Light green to yellow leaves with spindly, weak stems from low light intensity.

Management: Provide 150 ft-c light for up to 16 hours daily.

Integrated Schefflera Health Practices

Key strategies: disease-free propagation material; careful watering to keep foliage dry; cold protection (>50°F); adequate light (150 ft-c, ≤16 hrs/day); regular scouting for Alternaria and bacterial leaf spots; immediate removal of infected plants; monitoring nearby English ivy as bacterial leaf spot reservoir; and preventive fungicide applications during high-risk periods. The large leaf surface area makes Schefflera particularly susceptible to foliar pathogens when moisture is present.