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Pre-penetration of Colletotrichum gloeosporioides into leaflets of different rubber tree clones under the influence of different temperatures and periods of wetting

Grant number: 18/18088-5
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2018
Effective date (End): December 31, 2021
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal researcher:Ana Carolina Firmino
Grantee:Izabela Ponso Magalhães
Home Institution: Faculdade de Ciências Agrárias e Tecnológicas. Universidade Estadual Paulista (UNESP). Campus de Dracena. Dracena , SP, Brazil

Abstract

The rubber tree (Hevea brasiliensis Müell. Arg.) Is a species native to the Amazon region, widely cultivated in Brazil. The anthracnose, caused by fungi of the genus Colletotrichum, is present in the main planting areas of this tree species, such as São Paulo, Mato Grosso do Sul, Paraná, Minas Gerais and Espírito Santo, and in the north of the country. bad leaves. Anthracnose can affect different tissues of the rubber tree. In the leaves, branches and petioles the symptoms are manifested in the new shoots, causing lesions that can coalesce, leading to defoliation, death of the apical yolk and dry descendants of the branches. When this disease occurs in the bleeding panel there may be impairment of latex production. Therefore, studies that improve the understanding of the Colletotrichum x seringueira patosystem, provide support for further epidemiological studies and phytosanitary management of this disease in the field. The objective of this work was to evaluate the percentage of germinated and appressory conidia of C. gloeosporioides formed during the pre-penetration phase in leaflets of different rubber tree clones under the influence of different temperatures and periods of wetting. The results obtained will allow a better understanding of the etiological and epidemiological aspects of the disease, providing subsidies for the development and adoption of adequate control methods for Colletotrichum species associated with rubber tree anthracnose in Brazil.

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