How to Manage Pests

UC Pest Management Guidelines

Gerbera (Gerbera jamesonii)
	Bacterial leaf spot	Pseudomonas cichorii
	Black root rot	Thielaviopsis basicola
	Crown and root rot	Rhizoctonia solani
	Gray mold	Botrytis cinerea
	Leaf spots	Alternaria porri
		Cercospora gerberae
		Septoria spp.
		Ascochyta gerberae
	Phytophthora crown rot	Phytophthora cryptogea and others
	Powdery mildew	Erysiphe cichoracearum
	Pythium root rot	Pythium spp.
	Sclerotina crown rot	Sclerotinia sclerotiorum
	Spotted wilt	Tomato spotted wilt virus
	Verticillium wilt	Verticillium dahliae
	White rust **	Albugo tragoponis
German violet (Exacum affine)
	Basal stem rot	Nectria hematocca
	Gray mold	Botrytis cinerea
	Root rot	Pythium ultimum
	Spotted wilt	Tomato spotted wilt virus
Gloxinia (Sinningia speciosa)
	Cottony rot and flower blight	Sclerotinia sclerotiorum
	Crown rot	Myrothecium roridum
	Crown rot and tuber rot	Rhizoctonia solani
	Gray mold	Botrytis cinerea
	Ring spot	physiological (cold water and light)
	Root and crown rot	Phytophthora cryptogea
		P. nicotiana
	Root rot	Pythium spp.
	Southern blight	Sclerotium rolfsii
	Spotted wilt	Tomato spotted wilt virus
Hydrangea (Hydrangea macrophylla)
	Gray mold	Botrytis cinerea
	Powdery mildew	Erysiphe polygoni
	Rhizoctonia stem rot	Rhizoctonia solani
	Ringspot	Hydrangea ringspot virus
	Root knot nematode	Meloidogyne spp.
	Root rot	Pythium spp.
	Virescens	Phytoplasma

Impatiens (Impatiens wallerana)
	Bacterial fasciation	Rhodococcus fascians
	Black root rot	Thielaviopsis basicola
	Brown crown canker	Rhizoctonia solani
	Crown rot	Pythium ultimum
		Rhizoctonia solani
	Gray mold	Botrytis cinerea
	Impatiens necrotic spot	Tospovirus
	Leaf spot	Phyllosticta sp.
	Root rot	Pythium sp.
	Southern wilt	Sclerotium rolfsii
	Verticillium wilt	Verticillium dahliae
Kalanchoe (Kalanchoe blossfeldiana)
	Aster yellows	Phytoplasma
	Edema	Nonparasitic; cause unknown
	Leaf and stem blight	Botrytis cinerea
	Leaf spots	Stemphylium spp.
	Fasciation	Cercospora sp.
	Powdery mildew	Erysiphe polygoni
	Root and crown rot	Phytophthora spp.
	Spotted wilt	Tomato spotted wilt virus
	Stem rot	Myrothecium roridum
	Top-spotting	Top-spotting virus
Lilac (Syringa vulgaris and S. persica)
	Armillaria root rot	Armillaria mellea
	Bacterial blight	Pseudomonas syringae pv. syringae
	Crown gall	Agrobacterium tumefaciens
	Gray mold	Botrytis cinerea
	Leaf blotch	Heterosporium syringae
	Phytophthora blight	Phytophthora spp.
	Phytophthora root rot	Phytophthora spp.
	Powdery mildew	Microsphaera penicillata
	Shoot blight	Sclerotinia sclerotiorum
Pouch Flower (Calceolaria herbeohybrida)
	Cottony rot	Sclerotinia sclerotiorum
	Gray mold	Botrytis cinerea
	Root and crown rot	Phytophthora spp.
	Root rot	Pythium spp.
	Spotted wilt	Tomato spotted wilt
	Stem rot	Myrothecium sp.
	Verticillium wilt	Verticillium dahliae
	Virus	Tospovirus
Primula (Primula X polyantha)
	Crown rot	Rhizoctonia solani
	Fasciation	Physiological; cause unknown
	Gray mold	Botrytis cinerea
	Leaf spot	Ramularia primulae
	Root rot	Pythium spp.
	Spotted wilt	Tomato spotted wilt virus

** Not reported in U.S.A.

PUBLICATION

UC IPM Pest Management Guidelines: Floriculture and Ornamental Nurseries
UC ANR Publication 3392
Diseases
R. D. Raabe (emeritus), Environmental Science, Policy, and Management (ESPM), UC Berkeley
M. E. Grebus, Plant Pathology, UC Riverside
C. A. Wilen, UC IPM Program, UC Cooperative Extension, San Diego Co.
A. H. McCain (emeritus), Environmental Science, Policy, and Management (ESPM), UC Berkeley

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