Data/hora: 03/06/2024 11:00:05

Biblioteca(s): | Epagri-Sede.
Data corrente: | 29/08/2017
Data da última atualização: | 29/08/2017
Autoria: | PERUCH, L. A. M.; MICHEREFF, S. J.; SILVA, A. C. F.
Título: | SPORE PRODUCTION LONGEVITY OF ALTERNARIA BRASSICICOLA IN LEAVES DEBRIS OF BROCCOLI.
Ano de publicação: | 2016
Fonte/Imprenta: | In: CONGRESSO BRASILEIRO DE FITOPATOLOGIA, 8., 2016, Florianópolis. Resumos... Florianopolis: Sociedade Brasileira de Micologia, 2016. p. 248
Idioma: | Inglês
Conteúdo: | The fungus Alternaria brassicicola is the main causal agent of Alternaria black spot in Brassica species in Brazil, but there is no studies related to factors affecting the pathogen longevity in leaves debris under the Brazilian conditions. The spore production longevity of A. brassicicola was investigated in leaves debris of broccoli, considering different depths of debris incorporation and systems of soil handling in the subtropical conditions of Santa Catarina, Brazil. Infected leaves debris of broccoli were distributed in portions in fields under conventional and organic management on the soil surface and at depths of 5 and 10 cm. Periodically, the debris in the bags were collected and conidia concentrations were quantified for longevity of spore production (days) and extinction rate (%/day). Data were submitted to Z test (5% error). The data showed that depth of debris incorporation influenced directly on pathogen spores production, being lower when incorporation was made at 5 and 10 cm depth. Pathogen inoculum survived 31 days at soil surface and 14 days at 10 cm depth. In relation to soil handling systems, when the inoculum source was deposited on the soil surface or 5 cm depth there were no differences in the rate of spore production extinction, but at depth of 10 cm, the rate was significantly higher in the soil under conventional handling. This means that higher extinction rates are expected in conventional management compared to organic systems. The management of Alternaria black spot on broccoli at the area under study can be accomplished by incorporating infected leaves debris in the soil, at least 10 cm depth, along with crop rotation, for no less than a 35-day interval in subsequent brassica plantings.
Palavras-Chave: | Alternaria black spot; brassica; Brassica oleracea var italica; inoculum source; survival.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_39696.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
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