Comparison of methods for determining budburst date in grapevine

Methods for determining budburst date in grapevine are poorly documented. Budburst defined from cumulative shoots burst (or arising) and buds (expressed as % of total) were compared using different cultivars, pruning systems irrigation treatments assessed at the plant, bearer individual bud level. The study was conducted three sites within an Australian vineyard over two years on mechanical pruned Chardonnay Cabernet-Sauvignon; mechanical, spur minimally Shiraz; control, regulated prolonged deficit irrigated Cabernet-Sauvignon. ‘50 total burst’ more reliable than when final low, observed under lighter (mechanical or minimal) Shiraz. Differences between related mainly to distribution (%) bearers according size (based node numbers) their specific percentage each position. timing based dependent a unique set parameters cultivar, regardless levels. new knowledge gained this about impact system treatment may be useful adapting phenological models vineyards.