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How to Manage Pests
UC Pest Management Guidelines
Floriculture and Ornamental Nurseries
Host-Pathogen Index
(Reviewed 1/02,
updated 1/02)
In this Guideline:
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| African
Violet (Saintpaulia ionantha) |
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Bacterial blight |
Erwinia chrysanthemi |
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Foliar nematode |
Aphelenchoides ritzemabosi |
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Gray mold |
Botrytis cinerea |
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Phytophthora crown rot |
Phytophthora parasitica |
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Powdery mildew |
Erysiphe cichoracearum |
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Sphaerotheca fuliginea |
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Pythium root rot |
Pythium spp. |
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Rhizoctonia stem rot |
Rhizoctonia solani |
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Ring spot |
physiological (cold water and light) |
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| Christmas cactus (Schlumbergera
bridgesii) |
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Crown rot |
Phytophthora parasitica |
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Pythium aphanidermatum |
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Fusarium rot |
Fusarium oxysporum |
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Gray mold |
Botrytis cinerea |
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Root and stem rot |
Rhizoctonia solani |
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Root rot |
Pythium irregulare |
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Stem rot |
Phytophthora spp. |
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Stem rot and leaf spot |
Bipolaris cactivora |
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Virus |
Cactus virus X |
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| Candytuft (Iberis amara) |
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Alternaria leaf spot |
Alternaria brassicae |
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Basal stem rot |
Phoma lingum |
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Club root |
Plasmodiophora brassicae |
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Gray mold |
Botrytis cinerea |
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Phytophthora root rot |
Phytophthora spp. |
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Powdery mildew |
Erysiphe polygoni |
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Pythium root rot |
Pythium spp. |
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Root knot nematode |
Meloidogyne sp. |
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White rust |
Albugo candida |
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| Cineraria (Senecio cruentis) |
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Collar rot |
Rhizoctonia solani |
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Downy mildew |
Plasmopara halstedii |
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Gray mold |
Botrytis cinerea |
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Erysiphe cichoracearum |
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Impatiens necrotic spot |
Tospovirus |
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Leaf spot |
Alternaria cinerariae |
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Powdery mildew |
Sphaerotheca fulginea |
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Root and collar rot |
Phytophthora spp. |
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Root rot |
Pythium ultimum |
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Spotted wilt |
Tomato spotted wilt virus |
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Stem rot |
Sclerotinia sclerotiorum |
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| Gardenia (Gardenia jasminioides) |
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Bacterial leaf spot |
Xanthomonas campestris pv. maculifoliigardeniae |
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Chlorosis |
iron deficiency |
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Petal blight (gray mold) |
Botrytis cinerea |
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Phomopsis canker |
Phomopsis gardeniae |
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Root knot nematode |
Meloidogyne spp. |
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Impatiens (Impatiens wallerana)
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Bacterial fasciation |
Rhodococcus fascians |
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Black root rot |
Thielaviopsis basicola |
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Brown crown canker |
Rhizoctonia solani |
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Crown rot |
Pythium ultimum |
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Rhizoctonia solani |
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Gray mold |
Botrytis cinerea
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Impatiens necrotic spot |
Tospovirus |
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Leaf spot |
Phyllosticta sp. |
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Root rot |
Pythium sp. |
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Southern wilt |
Sclerotium rolfsii |
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Verticillium wilt |
Verticillium dahliae |
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Kalanchoe (Kalanchoe
blossfeldiana) |
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Aster yellows |
Phytoplasma |
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Edema |
Nonparasitic; cause unknown |
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Leaf and stem blight |
Botrytis cinerea |
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Leaf spots |
Stemphylium spp. |
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Fasciation |
Cercospora sp. |
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Powdery mildew |
Erysiphe polygoni |
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Root and crown rot |
Phytophthora spp. |
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Spotted wilt |
Tomato spotted
wilt virus |
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Stem rot |
Myrothecium roridum |
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Top-spotting |
Top-spotting virus |
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| Lilac (Syringa
vulgaris and S. persica) |
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Armillaria root rot |
Armillaria mellea |
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Bacterial blight |
Pseudomonas syringae pv. syringae |
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Crown gall |
Agrobacterium tumefaciens |
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Gray mold |
Botrytis cinerea |
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Leaf blotch |
Heterosporium syringae |
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Phytophthora blight |
Phytophthora spp. |
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Phytophthora root rot |
Phytophthora spp. |
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Powdery mildew |
Microsphaera penicillata |
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Shoot blight |
Sclerotinia sclerotiorum |
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| Pouch Flower
(Calceolaria herbeohybrida) |
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Cottony rot |
Sclerotinia sclerotiorum |
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Gray mold |
Botrytis cinerea |
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Root and crown rot |
Phytophthora spp. |
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Root rot |
Pythium spp. |
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Spotted wilt |
Tomato spotted wilt |
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Stem rot |
Myrothecium sp. |
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Verticillium wilt |
Verticillium dahliae |
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Virus |
Tospovirus |
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| Primula (Primula
X polyantha) |
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Crown rot |
Rhizoctonia solani |
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Fasciation |
Physiological; cause unknown |
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Gray mold |
Botrytis cinerea |
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Leaf spot |
Ramularia primulae |
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Root rot |
Pythium spp. |
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Spotted wilt |
Tomato spotted wilt virus |
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** Not reported in U.S.A.
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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