Fig. 6.

GPGV symptomatic vines produce significantly fewer grape bunches. Differences in grape bunches produced between GPGV-infected vines of different infection levels (l latent, sls slightly symptomatic, ms moderate symptomatic, svs severe symptomatic) and vines without GPGV infections in 2019 and 2020 are shown. Latent GPGV infections have no negative impact on the number of grape bunches, while symptomatic vines have fewer grapes. Asterisks indicate significant differences to GPGV-negative vines according to ANOVA and Tukey HSD tests