Choanephora fruit rot

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Choanephora fruit rot
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Choanephora fruit rot on a straight neck squash
Scientific Classification
Kingdom: Fungi
Phylum: Zygomycota
Class: Zygomycetes
Subclass: Incertae sedis
Order: Mucorales
Family: Choanephoraceae
Genus: Choanephora
Species: Choanephora cucurbitarum
Choanephora rot

Choanephora americana A. Møller, (1901)
Choanephora heterospora B.S. Mehrotra & M.D. Mehrotra, (1962) [1961]
Choanephora infundibulifera f. cucurbitarum (Berk. & Ravenel) Schipper
Choanephora mandshurica (Saito & H. Nagan.) F.L. Tai, (1934)
Choanephora simsonii D.D. Cunn. [as 'simsoni'], (1895)
Choanephorella cucurbitarum (Berk. & Ravenel) Vuill., (1904)
Cunninghamella mandshurica Saito & H. Nagan., (1915)
Mucor cucurbitarum Berk. & Ravenel, (1875)
Mucor curtus Berk. & M.A. Curtis, (1875)
Rhopalomyces cucurbitarum Berk. & Ravenel, (1875)

Rhopalomyces elegans var. cucurbitarum (Berk. & Ravenel) Marchal, (1893)

Choanephora fruit rot (Choanephora cucurbitarum) is a plant pathogen affecting [[::Category:Cucurbitaceae|cucurbits]]. Growth of the fungus is accelerated in temperatures above 25°C (77°F) and damp conditions. The condition affects blossoms and fruit, with increased risk to fruit nearer the ground. 30-40% of a plant may be infected with the fungus and while destructive, it only survives as long as the conditions which support it. Subsequent growths are likely to be unaffected provided the conditions are less conducive to it's growth.[1]

Symptoms[edit | edit source]

Affected fruit are watery and soft. Hairy, white fungal growth appears on the rotted area with purple-black fruiting bodies forming as the disease progresses. The fungus growth resemble small black-headed pins stuck into the fruit, sometimes called "whiskers." Disease development is promoted by high moisture conditions.[2]

Treatment[edit | edit source]

None. Use of fungicides is not practical as new blossoms open on a daily basis and ideal disease conditions can change quickly.[2]

Prevention[edit | edit source]

Where possible, avoid humid conditions by promoting air movement; increase plant spacing, provide adequate drainage, avoid overhead irrigation and avoid excess nutrition which creates a dense canopy.[3]

Refrigerated storage and careful handling will minimize decay postharvest.[2]

References[edit | edit source]


  1. Choanephora fruit rot on yellow straight neck squash. APS publication number: IW00007. Retrieved: 2010-08-01
  2. a b c Diagnosing Postharvest Diseases of Canaloupe - Choanephora rot. North Carolina State University. Retrieved: 2010-08-01.
  3. Roberts, P.D. Pernezny, K. Kucharek, T. Disease Management: Wet Rot, Choanephora blight. Integrated Pest Management, University of Florida.