Crop Knowledge Master Fungi

Oidium Primer

General Information Summary
Pathogens & Hosts Taxonomy Characteristics Disease Types Management Graphics References


Andrew K. Gonsalves, Educational Specialist

Stephen A. Ferreira, Extension Plant Pathologist

Department of Plant Pathology, College of Tropical and Agriculture and Human Resources

University of Hawaii at Manoa


Several Oidium species have been reported to occur in Hawaii (Raabe, et al., 1981). The following is a list of the reported pathogens from this genus (Oidium) and the hosts they infect. The list is organized by the scientific name of the pathogen species (CAPITAL LETTERS), followed by the various susceptible plant hosts. Words in blue indicate what symptom or disease a given pathogen causes on the listed hosts.


Powdery Mildew:

papaya (Carica papaya)


Powdery Mildew:

candlenut tree (Aleurites moluccana)

angelonia (Angelonia salicariaefolia)

aster (Aster sp.)

rex begonia (Begonia rex-cultorum)

rutabaga (Brassica campestris var. napobrassica)

coffee senna (Cassia occidentalis)

florist's chrysanthemum (Chrysanthemum morifolium)

Coreopsis sp.

cosmos (Cosmos bipinnata)

cucumber (Cucumis sativus)

winter squash (Cucurbita maxima)

pumpkin (Cucurbita pepo)

summer crook-neck squash (Cucurbita pepo var. melopepo)

gourd (Cucurbita pepo var. ovifera)

Cucurbita sp.

Dahlia ?variabilis

Dahlia sp.

Flora's painbrush (Emilia sonchifolia)

Erigeron sp.

wili wili (Erythrina sandwicensis)

strawberry (Fragaria chiloensis var. ananasa)

Transvaal daisy

soybean (Glycine max)

Jerusalem artichoke (Helianthus tuberosus)

okra (Hibiscus esculentus)

hydrangea (Hydrangea macrophylla)

Hydrangea sp.

lettuce (Lactuca sativa)

bottle gourd (Lagenaria siceraria)

Macroptilium atropurpureum

cassava (Manihot esculenta)

alfalfa (Medicago sativa)

bitter melon (Momordica charantia)

mung bean (Phaseolus aureus)

garden bean (Phaseolus vulgaris)

pea (Pisum sativum)

edible-podded pea (Pisum sativum var. macrocarpon)

tea rose (Rosa odorata)

Rosa sp.

chayote (Sechium edule)

mamane (Sophora chrysophylla)

stephanotis (Stephanotis floribunda)

Verbena sp.

Vigna radiata

Xanthium italicum

Xanthium saccharatum

cultivated zinnia (Zinnia elegans)

Zinnia sp.


Euphorbia sp.


KINGDOM: Mycetae (fungi)

DIVISION: Eumycota

SUBDIVISION: Deuteromycotina (The imperfect fungi)

CLASS: Hyphomycetes

ORDER: Hyphales (Moniliales)


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No information is available for this section at the moment, please check future Knowledge Master Versions.


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Agrios, G.N. 1988. Plant Pathology, 3rd edition. Academic Press, Inc: San Diego. 803 pp.

Farr, , D.F., G.F. Bills, G.P. Chamuris, and A.Y. Rossman. 1989. Fungi on Plants and Plant Products in the United States. APS PRESS: St. Paul, Minnesota. 1252 pp.

Raabe, Robert D., Ibra L. Conners, and Albert P. Martinez. 1981. Checklist of Plant Diseases in Hawaii. Hawaii Institute of Agriculture and Human Resources, College of Tropical Agriculture and Human Resources, University of Hawaii (Information Text Series 022).

Streets, R.B. 1982. The Diagnosis of Plant Diseases: a field and laboratory manual emphasizing the most practical methods for rapid identification. The University of Arizona Press: Tucson, Arizona.



JUNE 1994



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