Cucumber Mosaic Virus (CMV): Advances in Molecular Understanding, Disease Ecology and Management

Cucumber mosaic virus (CMV) is widely recognized as a damaging pathogen in cucurbits and numerous other horticultural crops. It has an unusually broad host range, with the ability to infect more than 1,000 plant species, and it can also persist in common weed populations, which facilitates its rapid dissemination within cropping systems. Among the many insects that can carry the virus, the aphid Aphis gossypii is generally regarded as the most efficient at transmitting it. Because of these factors, growers frequently report management challenges due to the virus’s broad host range and efficient vector transmission. Plants affected by CMV may show a mixture of symptoms including mosaic mottling, leaf distortion, yellowing, reduced growth, and malformed plant structures. Collectively, these symptoms contribute to reduced plant vigor, diminished yields, and poor-quality marketable produce. Research at the molecular level has shown that much of the virus’s ability to damage plants is linked to components such as the CMV 2b protein, which interferes with RNA-silencing processes and disrupts hormonal regulation, promoting enhanced viral accumulation within host tissues. Several types of laboratory tests are commonly employed to confirm the presence of CMV. ELISA and similar serological assays are still widely used, while molecular techniques such as RT-PCR and LAMP offer higher sensitivity. High-throughput sequencing is becoming increasingly accessible for early detection and strain differentiation. Farmers rarely depend on a single tactic to manage CMV. They integrate crop rotation, hygiene, and vector control. Novel molecular tools such as CRISPR-based genome editing and RNA interference are being explored to enhance detection and resistance strategies, and plant breeders are actively developing CMV-resistant cultivars. While these emerging approaches show promise, long-term field validation is still required. CMV infection increases management costs due to additional monitoring and control inputs. Reducing CMV-related losses requires continued research on virus-host interactions, resistant variety development, and integrated management. Keywords: Cucumber mosaic virus; Cucurbitaceae; aphid transmission; diagnostics; epidemiology; CMV 2b protein; satRNAs; integrated disease management.