Department of Plant Pathology Plant Disease Facts

Gary Moorman
Professor of Plant Pathology

Calceolaria Diseases

Disease	Symptoms	Pathogen/Cause	Management
Botrytis Blight	Leaves, especially those near the soil surface, rot and become covered with gray fungal growth as do fading flowers.	Botrytis cinerea	Heat and ventilate to maintain low humidity. Remove dead and dying tissue from the greenhouse. Apply chlorothalonil.
Phytophthora Root and Crown Rot	Crowns and roots have dark brown spots at the soil level. This spreads up the stem as plants wilt and die. Roots are killed.	Phytophthora spp.	Plant in pasteurized potting mix. Discard infected plants. Apply etridiazole to protect healthy plants.

Fungicides mentioned above:

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Last modified Tuesday, August 1, 2006