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Cucurbit yellow stunting disorder virus
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First report of Cucurbit yellow stunting disorder virus in Arizona and possibly California (pending DNA confirmation)


Name: Cucurbit yellow stunting disorder virus

Taxonomic Position:

Closteroviridae : Closterovirus

Common Names:



Cucurbit yellow stunting disorder virus (CYSDV) was detected for the first time in Arizona melon fields. Melons in Imperial Valley, California are also suspected of having the virus, however DNA testing is still underway. This whitefly transmitted virus causes yellowing of the older leaves and is closely related to Lettuce infectious yellows virus. CYSDV is native to the Middle East but was previously detected in west Texas where it caused reduced yields and quality. Arizona melon growers are experiencing similar reductions. (Katz, 2006)

Issues of Concern:

Damage in certain Arizona melon production areas is widespread (Katz, 2006) and control of CYSDV can be difficult due to a lack of resistant cultivars and the ability of the vector to become resistant to insecticides (EPPO, 2005).


At present, CYSDV appears to be exclusive to the Cucurbitaceae plant family. Lactuca sativa is considered an experimental host (EPPO, 2005).


Bemisia tabaci (EPPO, 2005)

Detection Strategies

There are two groups of CYSDV isolates: one is composed of isolates from Spain, Lebanon, Jordan, Turkey, and North America; the other is from Saudi Arabia (EPPO, 2005).



EPPO. 2005. Cucurbit yellow stunting disorder crinivirus. Datasheets on Quarantine Pests. European Plant Protection Organization Bulletin. 35: 442-444.

Katz, M. 2006. New melon virus widespread in the desert. Western Farm Press. Prism Business Media Inc.

Warning: The information in this alert has not been confirmed with the appropriate National Plant Protection Organization and is provided solely as an early warning. Please use the above information with caution.

Phytosanitary Alert System
Pest Alert
Prepared on: 11/20/2006
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