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Preparations for fall melons has started and planting will be underway in a few weeks. Growers and PCAs are well aware of Cucurbit Yellow Stunting Disorder Virus (CYSDV) and the impact it has on fall melons. This whitefly transmitted crinivirus was first identified on desert melons in the 2006 where widespread infections on cantaloupes, honeydews and other melons occurred. CYSDV can cause significant losses in melon fruit yield and quality, and without question, desert melon crops have been seriously affected by this virus. Melon IPM programs have also been impacted the virus where insecticide usage on fall melons has increased significantly. However, in the past two fall growing seasons, whitefly populations have been lighter than normal, and CYSDV incidence on fall melons was the lowest we’ve recorded on melons since the virus as first reported in Yuma (see graphs below). Thus far, whitefly numbers this spring and summer have been relatively light compared to previous years. Although, the incidence of CYSDV was generally light on spring melons, it was still present in some fields. How these low numbers translate into virus incidence on the fall melon crop is unknown? Regardless, experience suggests that growers should anticipate CYSDV to be present. Further, given the aggressive management programs that PCAs and growers are now using, it will be interesting to see how CYSDV impacts melon production this fall. | |||
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For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
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