Relative susceptibility of Vitis vinifera cultivars to vector-borne Xylella fastidiosa through time.

For example, cultivars Flame seedless, Thompson seedless and Zinfandel showed severe symptoms on week 16, significantly more so than week 8, yet infection level in those cultivars had a negative trend across the three sampling periods.

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In spite of a positive trend, the correlation between symptom severity and infection levels among evaluated grape cultivars on weeks 8 and 16 post-inoculation was non-significant (week 8: P. corr. = 0.229, P = 0.524; week 16: P.

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