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In vitro evaluation of the effect of methanol and dichloromethane-based extracts of beach-cast seaweeds in Colletotrichum acutatum isolates

Grant number: 21/10180-2
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2021
Effective date (End): November 30, 2022
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Maria Candida de Godoy Gasparoto
Grantee:Antonio Gabriel Pontes dos Reis
Host Institution: Faculdade de Ciências Agrárias. Universidade Estadual Paulista (UNESP). Campus do Vale do Ribeira. Registro , SP, Brazil


In agriculture, the Colletotrichum genus infects various fruit orchards. In São Paulo State, citrus plants can be infected by this fungal genus, and it is affected mainly by Postbloom fruit drop (PFD) caused by species of the same genus: Colletotrichum acutatum sensu lato (C. abscissum) and Colletotrichum gloeosporioides. The first species is more prevalent in São Paulo State orchards. The high frequency of fungicide application to control PFD, and the low number of registered products, which have the same mode of action, can result in more residues in the environment, and the selection of fungicide-resistant pathogens in the field. Previous studies verified the effect of algae extracts on different phytopathogenic fungi, making it possible an alternative for PFD control. A seaweed group demonstrates advantages to control plant disease due to its high availability in nature and its easy access and harvesting: beach-cast seaweeds. The objective of this study is to evaluate in vitro effect of methanol and dichloromethane-based extracts of beach-cast seaweeds in two Colletotrichum acutatum isolates. The experiments will evaluate the efficiency of the extracts to control mycelial growth, sporulation, conidial germination, and secondary conidial production of the fungal isolates. (AU)

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