Abstract
The stage of dormancy is an important physiological condition in the behavior of temperate climate fruit trees, and it is reached at the end of the vegetative cycle, when the leaves are fallen. In general, a cold period is needed to overcome the state of dormancy and promote uniform buds sprouting, being therefore a limiting factor for grape production in Brazil. There are chemicals used in breaking dormancy of the vines, allowing the production. However, there is need to restrict the use of those products in the management of orchards, defending sustainable fruit production systems. For this purpose, alternative products, such as garlic extract, have shown promising results in overcoming dormancy in fruit trees. The objective of this study was to evaluate the effect of different doses of natural garlic extract (NGE) (Allium Sativum L.) and Bioalho® (Natural Rural S.A.) added or not to mineral oil (MO) (2%), in overcoming dormancy of grapevines buds of the cultivar 'Isabel Precoce' (Vitis Labrusca L.), soil and climate conditions of the region of Lavras – Minas Gerais. The results of this study showed that the action of NGE and Bioalho® in breaking dormancy in different intensities, and the treatments with NGE 15% + MO (2%), NGE 20% with and without MO (2%), Bioalho® 15% with and without MO (2%) and Bioalho® 20% with and without MO (2%) had the best results in the induction of the shoots of the vines 'Isabel Precoce'. Key words: Garlic extract, buds, sprouting, grapes.
Highlights
The fruit trees of temperate climate have a mechanism of protection that allows their survival in adverse weather conditions, known as dormancy (Campoy et al, 2011)
The objective of this study was to evaluate the effect of different doses of natural garlic extract (NGE) (Allium Sativum L.) and Bioalho® (Natural Rural S.A.) added or not to mineral oil (MO) (2%), in overcoming dormancy of grapevines buds of the cultivar 'Isabel Precoce' (Vitis Labrusca L.), soil and climate conditions of the region of Lavras – Minas Gerais
The results of this study showed that the action of NGE and Bioalho® in breaking dormancy in different intensities, and the treatments with NGE 15% + MO (2%), NGE 20% with and without MO (2%), Bioalho® 15% with and without MO (2%) and Bioalho® 20% with and without MO (2%) had the best results in the induction of the shoots of the vines 'Isabel Precoce'
Summary
The fruit trees of temperate climate have a mechanism of protection that allows their survival in adverse weather conditions, known as dormancy (Campoy et al, 2011). According to Perez and Lira (2005), temperature is the most important environmental variable in the induction processes and overcoming of dormancy of these fruit trees. Low temperatures lead these plants to a state of physiological inactivity. In the case of vines, a leading fruit of temperate climate, this period can vary from 50 to 400 h, with temperature at 7°C, depending on the cultivar (Botelho and Muller, 2007).
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