Cladosporium cucumerinum
scab of cucurbits
Cladosporium cucumeris, Cladosporium scabies, Macrosporium cucumerinum, Macrosporium melophthorum, Scolicotrichum melophthorum
Africa: Kenya, Mauritius, Morocco, South Africa, Zambia, Zimbabwe; Asia: Azerbaijan, Bhutan, China, India, Iran, Israel, Japan, Lebanon, Pakistan, South Korea, Thailand, Turkey, Yemen; Europe: Austria, Belarus, Bulgaria, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Lithuania, Netherlands, Norway, Poland, Portugal, Romania, Russia, Sweden, UK; North America: Barbados, Canada, Cuba, El Salvador, Mexico, Panam, Puerto Rico, Trinidad and Tobago, USA; Oceania: French Polynesia; South America: Chile.
FL. ME, MI, NY, NC, OK, OR, TX, WA
2025-12-22
fungus
China
Main: cucumber; Other: pumpkin, gourd, melon, watermelon
CLADCU
Cladosporium cucumerinum is a fungal pathogen that causes scab disease primarily in cucurbits, especially cucumber. It survives on infected plant debris and spreads mainly through rain splash, irrigation water, and mechanical contact, infecting leaves, stems, and fruit under cool, moist conditions. Seed transmission has been suggested in early literature, but it is generally considered a minor or uncertain pathway compared with field-to-field spread via infected debris and splash dispersal. Infection occurs rapidly under wet conditions, with symptoms developing within days and new spores produced shortly thereafter, allowing quick disease buildup and spread.
Crops
Citrullus lanatus
watermelon
No
CLADCU-1, CLADCU-3
Pathway not proven. Though seed is often listed as a pathway, there has been no research or literature found showing seed is a pathway for this pathogen on this host. Seed pathway may be inferred because the pest can be associated with seed in Cucurbita spp. and C. sativus.
No test specific for C. lanatus was found. Freezing blotter has been used for Cucurbita spp.
Seed surface-disinfestation with 0.5% sodium hypochlorite for 10 min to decrease all fungal contamination
CLADCU-1
Cucumis melo
melon
No
CLADCU-1, CLADCU-2, CLADCU-3
Pathway not proven. Though seed is often listed as a pathway, there has been no research or literature found showing seed is a pathway for this pathogen on this host. Seed pathway may be inferred because the pest can be associated with seed in Cucurbita spp. and C. sativus.
No test specific for C. melo was found. Freezing blotter has been used for Cucurbita spp.
Seed surface-disinfestation with 0.5% sodium hypochlorite for 10 min to decrease all fungal contamination
CLADCU-1
Cladosporium cucumerinum In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
International Seed Federation Regulated Pest List Database. www.pestlist.worldseed.org Nyon Switzerland
Zitter, T.A. Scab 2016. The American Phytopathologogical Society APSnetfeatures. (http://www.apsnet.org/publications/apsnetfeatures/Pages/Scab.aspx) St. Paul, MN
Cucumis sativus
cucumber
Yes
CLADCU-1, CLADCU-2, CLADCU-3, CLADCU-6, CLADCU-7
The pathogen has been found on seed, especially in early publications. Seed borne inoculum appears to be relatively minor, the pathogen commonly survives in the soil and debris. Seed quality programs have greatly reduced inculum associated with seed and inoculum in soil debris more common.
No test specific for C. sativus was found. Freezing blotter has been used for Cucurbita spp.
Seed surface-disinfestation with 0.5% sodium hypochlorite for 10 min to decrease all fungal contamination
Resistance in known. Seed quality programs have effectively controlled seed inoculum.
CLADCU-2
Cladosporium cucumerinum In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
International Seed Federation Regulated Pest List Database. www.pestlist.worldseed.org Nyon Switzerland
Zitter, T.A. Scab 2016. The American Phytopathologogical Society APSnetfeatures. (http://www.apsnet.org/publications/apsnetfeatures/Pages/Scab.aspx) St. Paul, MN
LEAF, O.A., 1963. The Relation of Seed and Soil-borne Inoculum to the Epidemiology of Angular Leaf Spot of Cucumber in Wisconsin. The Plant Disease Reporter, 47:15
Ellis, M.B. and Holliday, P., 1972. Cladosporium cucumerinum.[Descriptions of Fungi and Bacteria]. IMI Descriptions of Fungi and Bacteria, (35).
Cucurbita spp.
squash, pumpkin, gourd
No
CLADCU-1, CLADCU-2, CLADCU-3, CLADCU-4, CLADCU-7
Pathway not proven. Though seed is often listed as a pathway, there is little evidence that seed is a pathway for this host. Seed-borne inoculum appears to be of minor importance and it is often found in soil debris. Cladosporium spp. on pumpkin seed, has been reported, but it is unclear if the it was identified to species and assumed Cladosporium cucumerinum was the species observed. Seed transmission was not proven and was externally associated with the seed.
Yes
Freezing blotter
Used to identify Cladosporium spp. on seed, but did not identify the Cladosporium to species. This method has not been validated or standardized.
CLADCU-4
Seed surface-disinfestation with 0.5% sodium hypochlorite for 10 min to decrease all fungal contamination
CLADCU-1
Cladosporium cucumerinum In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
International Seed Federation Regulated Pest List Database. www.pestlist.worldseed.org Nyon Switzerland
Zitter, T.A. Scab 2016. The American Phytopathologogical Society APSnetfeatures. (http://www.apsnet.org/publications/apsnetfeatures/Pages/Scab.aspx) St. Paul, MN
Cassaroli, D., Garcia, D.C., Muniz, M.F.B & Menezes, N.L. 2006. Qualidade sanitária e siológica de sementes de abóbora variedade Menina Brasileira. Fitopatologia Brasileira 31:158-163
Ellis, M.B. and Holliday, P., 1972. Cladosporium cucumerinum.[Descriptions of Fungi and Bacteria]. IMI Descriptions of Fungi and Bacteria, (35).
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