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K.L. Beal · Proceedings of the New Zealand Weed Control Conference · 2000
The relationship between necrotic grape tissue found trapped within bunches (bunch trash) and Botrytis cinerea infection of berries was assessed at harvest in three Marlborough Sauvignon blanc vineyard blocks, during three growing seasons from 1998 to 2000. There were differences (P<0.01) in the amount of trash components/bunch. The percent infestation also differed between tissues (P<0.01), with stamens (0), aborted flowers (10, 4 and 8), aborted berries (30, 20 and 14), calyptras (35, 15 and 10), damaged mature berries (50, 44 and 52), tendrils (73, 32 and 77) and leaf pieces (47, 32 and 41) in 1998, 1999 and 2000 respectively. Aborted and damaged berries and calyptras are the components most likely to provide inoculum for bunch rot because they are both relatively numerous and commonly infested. These components of bunch trash were positively correlated with the presence of infected berries at harvest in some vineyards in some seasons. The reasons for variations in rate of infestation are discussed.