Application of naphthaleneacetic acid in pre-harvest and post-harvest practices, aiming the maintenance of table grapes quality, in main producer regions of São Paulo State and economic feasibility for the application of these technologies

• Grant number: 11/01302-5
• Support Opportunities: Regular Research Grants
• Start date: July 01, 2011
• End date: June 30, 2013
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Maurilo Monteiro Terra
• Grantee: Maurilo Monteiro Terra
• Host Institution: Instituto Agronômico (IAC). Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brazil

Abstract

Losses arising from berry falling and disease problems in pre and post-harvest are important at viticulture and it is important to look for alternatives to minimize those losses. For this purpose, this research project aims to investigate the effects of naphthaleneacetic acid (NAA) pre-harvest application to reduce losses by berry falling and decay on post-harvest, for Niagara Rosada, Centennial Seddless and Venus cultivars, at the eastern, northwestern and southwestern Sao Paulo state regions and the economic viability of the treatments pre and post-harvest to improve the quality of the grapes. In the field experiments, the treatments will consist of five concentrations of naphthaleneacetic acid (0, 50, 100, 150 and 200 mg L-1) applied in two different periods (10 and 1 days before harvesting). The applications of ANA will be performed by direct clusters spraying. After harvest, will be evaluated fresh mass, length and width of the clusters, berries and rachis, pedicel diameter, number of berries per cluster, percentage of berry falling, decay incidence, bark color, firmness, rachis appearance, soluble solids, pH, titratable acidity and ratio. Clusters from different treatments will also be stored at room temperature (25 °C ± 1 ºC / 75% ± 5% RH) for 3-5 days, or refrigerated (1 °C ± 1 °C / 90% ± 5% RH) for 21 days, followed by transfer to room temperature for more 3-5 days and evaluated after these periods for the same parameters already mentioned. Dosis of UV-C and MA will also be evaluated in post-harvest grapes. (AU)