Photo 2. Distortion of zucchini fruit caused (possibly) by Zucchini yellow mosaic virus. Similar symptoms occur from infections by Papaya ringspot virus.
Photo 3. Infection of zucchini by unknown virus(es). The young leaves are pale and have green areas along some of the main veins (e.g., leaf over the fruit). The fruit shows dark raised patches.
Zucchini yellow mosaic
Zucchini yellow mosaic virus, Zucchini yellow mosaic potyvirus. The virus exists as many strains.
Zucchini yellow mosaic virus is not alone in causing mosaics in zucchini and other cucurbits, there is Watermelon mosaic virus and Papaya ringspot virus type W. Watermelon mosaic virus causes mosaics (light and green patterns) on the leaves, whereas the other two distort both leaves and fruit. Cucumber mosaic virus also infects zucchini producing stunted distorted leaves, and surface roughness of the fruit.
AUTHOR Grahame Jackson
Information (and Photo 2) Diseases of vegetable crops in Australia (2010). Editors, Denis Persley, Tony Cooke, Susan House. CSIRO Publishing; and from CABI (2014) Zucchini yellow. Crop Protection Compendium. (http://www.cabi.org.cpc/). Photo 1 Kohler F, Pellegrin F, Jackson G, McKenzie E (1997) Diseases of cultivated crops in Pacific Island countries. South Pacific Commission. Pirie Printers Pty Limited, Canberra, Australia. Photo 3 Semisi Pone, Auckland, New Zealand.
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.
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