ALTERNATIVE SHOOT TIP MANAGEMENT PRACTICES IMPACT ABOVE AND BELOW GROUND GROWTH IN VITIS VINIFERA
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Excessive vegetative growth in grapevines is managed by growers using summer hedging, where shoot tips are cut off to maintain vine form in vertically shoot positioned training systems. However, hedging can promote lateral shoot growth, exacerbate cluster compactness, and cause uneven ripening. This dissertation explores wrapping or tucking shoots as an alternative to hedging.Beginning in 2016, studies were conducted on ‘Cabernet franc’ and ‘Riesling’ (Vitis vinifera L) grapevines in Lansing, NY, to test the impact of shoot wrapping or tucking at different phenological stages on yield components, lateral emergence, cluster compactness, and fine root tip production, age, and distribution. Shoot wrapping reduced lateral emergence by up to 56% in the fruit zone and up to 50 and 43% for the middle and upper canopies, respectively. Shoot wrapping also reduced cluster compactness by up to 2.4 berries per cm rachis in ‘Cabernet franc’ vines and drove the production of fine roots deeper into the soil profile. It also increased fine root tip production when applied early (shoots 30 cm above top catch wires) by at least 50% compared to the hedge control and the shoot tuck treatment. The findings of this dissertation suggest that these practices may confer more resiliency to the vine in the face of a changing climate with reduced cluster compactness, a younger fine root population, and more fine roots, particularly in the deeper soil layer.
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Setter, Timothy
Mansfield, Anna