We are training home gardeners to identify possible cucumber and chayote mosaic viruses and would like protocols that were successfully used in the field.
Lance Hill It is not so simple. As it was shown by McLeish et al., CMV is a central point of interaction between many other viruses changing symptoms and disease severity.
McLeish, Michael J., Aurora Fraile, and Fernando García‐Arenal. "Trends and gaps in forecasting plant virus disease risk." Annals of Applied Biology 176.2 (2020): 102-108.
As Prof. Ignatov said; it's too hard and complicated identification of plant viruses by symptoms
But in my opinion, the best image collection for cucurbits diseases and their control is this Book:
Compendium of Cucurbit Diseases and Pests, Second Edition
- A. P. Keinath,
- W. M. Wintermantel,
- T. A. Zitter
https://apsjournals.apsnet.org/doi/book/10.1094/9780890545744
https://doi.org/10.1094/9780890545744
ISBN:978-0-89054-574-4
symptoms of Common Mosaic Virus (CMV):
(1.) The infection of CMV in plants are mottle, mosaic, vein clearing, yellow
discoloration, narrowing, or shoe-stringing.
(2.) The CMV infection symptoms in plants are highly dependent on plant
age; young plants tend to show more severe symptoms, while
plants at later development stages may be asymptomatic.
(3.) At young stage of plats with infection, early leaves are slightly wrinkled or bumpy and pale green. (4.) During growth, the foliage symptoms may develop oak-leaf patterns or ringspot.
(5.) New leaves emerge, they develop a chlorotic mosaic pattern that tends to encompass the entire leaf.
6.) CMV-infected plants also tend to show severe stunting and reduced formation and setting of flowers.
(7.) The fruits are small, malformed, bumpy, patchily discolored, and may show depressed spots or necrotic lesions. (8.) CMV leading to significantly reduced the yield and quality of fruits.
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