By G L Creasy; Leroy L Creasy
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If the primary bud is killed by cold temperatures in winter, the secondary bud will grow; if the secondary bud is killed the tertiary bud can grow. The largest clusters are found on the primary buds; in comparison, the secondary bud has inferior clusters and results in a lower yield. Tertiary buds generally do not have clusters, but following a severe winter or early-season frost damage, at least the vine is able to grow to normal size from those. When environmental conditions become favourable, one of the shoot primordia Ϫ usually the primary one Ϫ will begin to grow and push out of the Cultivars, Anatomy and Improvement 19 Fig.
One physiological disorder that is probably connected to a lack of available carbohydrate is early bunchstem necrosis (syn. inflorescence necrosis). This fruit set problem results in the loss of individual flowers, branches of flower clusters or even entire flower clusters in the weeks leading up to and including the fruit set period (Jackson and Coombe, 1988; Ibacache, 1990; Plate 15). , 1993). Its appearance is sporadic and difficult to predict, but can have a significant effect on yields. Deficiencies in certain nutrients can also reduce fruit set, chief among them being zinc and boron.
Wind can significantly affect the rate of water loss through the stomata by reducing the thickness of the boundary layer (area of still air) over the leaf. This increases the strength of the humidity gradient and thus the rate at which water exits the leaf. If the vine cannot supply enough water from the roots to match that lost through the leaves, the leaves and shoots would wilt. To prevent this, the vine shuts the stomata, preventing possibly lethal water loss, but also preventing photosynthesis and the production of carbohydrates.