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Postharvest diseases in orange fruits and characterization of the fungal population in organic and conventional farmers

Grant number: 07/08519-4
Support Opportunities:Regular Research Grants
Start date: June 01, 2008
End date: May 31, 2010
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Ivan Herman Fischer
Grantee:Ivan Herman Fischer
Host Institution: Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). São Paulo , SP, Brazil

Abstract

The organic plantation of citrus comes increasing annually, searching to take care of the increasing demand for healthful foods, produced without the use of pesticides. However, there are few studies about the influence of this type of management on the occurrence of pests and diseases and on the quality physical and chemical of the fruits. The purposes of this work are a) to characterize postharvest injuries (biotic, physiological and mechanics) in 'Valencia' oranges grown under organic and conventional conditions, as well as in organic and not organic fruits of orange, commercialized in the Companhia de Entrepostos e Armazéns Gerais de São Paulo (Ceagesp); b) to characterize the physical and chemical quality of the 'Valencia' fruits; c) to characterize the environmental mycoflora in citrus orchards and d) to detect the presence of isolated Penicillium spp. resistant to fungicides thiabendazole and imazalil in the orchards and disease fruits. Citric fruits will be collected at the orchards and at the Ceagesp, characterized how much to the physical and chemical quality and stored during 14 days at 25ºC and 85-90% of UR. The incidence of injuries will be evaluated visually every three days. The environmental mycoflora was sampled according to the gravimetric method, using Petri dishes containing potato-dextrose-agar medium, added or not of fungicides thiabendazole and/or imazalil. The postharvest injury incidence and the frequencies of fungal genera and of isolated Penicillium spp. resistant to fungicides between the orchards will be compared by the Tukey test, at 5% of probability. The results of postharvest injury incidence will be correlated with the physical and chemical quality of the fruits. (AU)

Articles published in Agência FAPESP Newsletter about the research grant:
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VEICULO: TITULO (DATA)
VEICULO: TITULO (DATA)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
IVAN HERMAN FISCHER; MARIA CECÍLIA DE ARRUDA PALHARINI; MARCEL BELLATO SPÓSITO; LILIAN AMORIM. Doenças pós-colheita em laranja 'Pêra' produzida em sistema orgânico econvencional e resistência de Penicillium digitatum a fungicidas. Summa Phytopathologica, v. 39, n. 1, p. 28-34, . (07/08519-4)
IVAN H. FISCHER; MICHELI M. ZANETTE; MARCEL B. SPÓSITO; LILIAN AMORIM. Doenças pós-colheita em laranja 'Valência' e caracterização da população fúngica em pomares orgânicos e convencionais. TROPICAL PLANT PATHOLOGY, v. 36, n. 6, p. 390-399, . (07/08519-4)