Evaluating sources of variability in inflorescence number, flower number and the progression of flowering in Sauvignon blanc using a Bayesian modelling framework

The time of flowering is key to understanding the development grapevines. Flowering coincides with inflorescence initiation and fruit set, important determinants yield. This research aimed determine between within-vine variability in 4-cane-pruned Sauvignon blanc number per shoot, flowers progression using an objective method assessing via image capture statistical analysis a Bayesian modelling framework. were measured by taking images over period. was assessed counting open closed for each two seasons. An ordinal multinomial generalised linear mixed-effects model (GLMM) fitted number, Poisson GLMM flower counts binomial progression. All models interpreted within Shoots arising from cane node one had lower numbers inflorescences compared those at nodes 3, 5 7, which similar. greater basal on shoot than apical ones. earlier, weeks, faster 2017/18 when 2018/19 reflecting seasonal temperature differences. duration varied position along cane. While flowered later earlier insertion points vine dominated date flowering.This first study framework assess presence as well quantification rather more subjective visual estimation field or cuttings. Although differed bunches, little difference timing these categories observed. point important. Overall, results indicate individual variation season are factors driving most likely impact set