Disease	Symptoms	Pathogen/Cause	Management
Phytophthora Root and Crown Rot	Crowns and roots have dark-brown spots at the soil level. This spreads up the stem and plants wilt and die. Roots are killed.	Phytophthora spp.	Plant in pasteurized potting mix. Discard infected plants. Apply etridiazole + thiophanate methyl to protect healthy plants.
Powdery Mildew	Tan, scabby spots form on leaves. These may become covered with white fungal growth or remain scabby.	Sphaerotheca humili	Maintain low humidity at night. Apply Ampelomyces, piperalin, triforine, triadimefon or thiophanate methyl + mancozeb.
Virus	Leaves may be mottled and have yellow spotting, dead flecks, line or ringspot patterns. Plants may be stunted and not flower.	Top spotting virus	Plant virus-indexed cuttings. Maintain good insect and mite control. Destroy infected plants. Do not take cuttings from infected plants.

COMMON NAME	TRADE NAME
Ampelomyces quisqualis	AQ10 (biological control agent)
etridiazole + thiophanate methyl	Banrot
piperalin	Pipron
thiophanate methyl + mancozeb	Zyban, Duosan
triforine	Triforine
triadimefon	Bayleton, Strike