Pennsylvania State University College of Agricultural Science Plant Patholgoy
Pennsylvania State University College of Agricultural Sciences College of Agricultural Sciences


Gary Moorman
Professor of Plant Pathology

Schefflera (Brassaia) Diseases

Disease Symptoms Pathogen/Cause Management
Alternaria Leaf Spot Large dark brown spots form on leaves and may have a yellow halo. Alternaria panax Avoid overhead watering. Apply iprodione, thiophanate methyl + mancozeb, or mancozeb to protect leaves.
Bacterial Leaf Spot Small, tan to yellow, corky, irregularly shaped spots form on the lower surface of the leaf. Spots up to 1/4 inch in diameter turn dark brown. Xanthomonas campestris pv. hederae Purchase plants free from the disease. Avoid overhead watering. Check nearby English ivy (Hedera helix) for bacterial leaf spot. Remove infected plants.
Cold Injury Dead areas form on leaves up to several days after exposure. Temperatures below 50 degrees F Do not place plants near air conditioners. Maintain temperatures above 50 degrees F.
Leaf Yellowing Leaves become light green or completely yellow. Stems are spindly and weak. Low light intensity Provide some and no more than 16 hours of light per day at 150 ft. candles.

COMMON NAME TRADE NAME
iprodione Chipco 26019
mancozeb Dithane, Mancozeb
thiophanate methyl + mancozeb  Zyban, Duosan


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Last modified Thursday, August 3, 2006
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