CucCAP squash breeders investigate resistance of two potyviruses

Genotypes of Cucurbita moschata with a range of susceptibility were inoculated with Papaya ringspot virus and Zucchini yellow mosaic virus and evaluated in the greenhouse and field. Yield reductions of up to 100% can be expected in C. moschata genotypes susceptible to PRSV or ZYMV, but fruit quality traits are usually unaffected. Moderate resistance to ZYMV in ‘Soler’ was observed to reduced symptom severity but not negative effects on yield and other traits. ‘Soler’ was not resistant to PRSV. ‘Menina’ rather than ‘Nigerian Local’ appears to be the best source of resistance because yield of the former was not impacted by inoculation with either potyvirus.

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