Quality organic guava production: pest and disease control and post-harvest treatment

• Grant number: 16/15647-8
• Support type: Regular Research Grants
• Duration: January 01, 2017 - February 28, 2019
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Juliana Altafin Galli
• Grantee: Juliana Altafin Galli
• Home Institution: Departamento de Descentralização do Desenvolvimento (APTA Regional). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brazil
• Assoc. researchers: Antonio Lucio Mello Martins ; Carlos Augusto Colombo ; Elisangela Marques Jeronimo Torres ; Ivan Herman Fischer ; Marcos Doniseti Michelotto ; Maria Cecília de Arruda ; Rosemary Marques de Almeida Bertani

Abstract

The objectives of this project are: to evaluate the effectiveness of attractive lures for fruit fly; the best time of fruit bagging; storage techniques; the susceptibility to infestation by fruit fly, the resistance of guava access to major postharvest diseases, differences between the cell walls of fruits susceptible and resistant to pathogens, determine the Silicon content of these fruits, evaluate the genetic variability of the accesses of Guava Germplasm Bank (GGB) and alternative pesticide treatments to maintain the quality of fruits of different guava accessions produced in organic system. An experiment will be conducted to compare the effectiveness of six food attractions of fruit fly, with McPhail traps. For experiments involving fruit, will be assessed the 20 most outstanding access to the highest production and fruit quality. It will be conducted an experiment to determine the appropriate time for bagging the fruits of guava trees. The fruits will be evaluated with regard to physico-chemical characteristics. It will be conducted an experiment to evaluate the effects of different coatings and storage temperatures on postharvest preservation of guavas, and an experiment for evaluation of alternative post-harvest treatments, for the control of anthracnose and other post-harvest rot. The rate and intensity of infestation per fruit fly will be assessed. Guava accesses less affected by major postharvest diseases will be inoculated with the fungal pathogens, aimed at confirming the disease resistance. The differences between the cell walls of fruits will be proven by means of scanning electron microscopy. Will be determined the Silicon content of these fruits, and the genetic variability of the guava tree will be evaluated by microsatellite markers. (AU)