Título:	Powdery mildew of ornamental species caused by Oidiopsis haplophylli in Brazil
Outros títulos:	Oídio em plantas ornamentais, causado por Oidiopsis haplophylli, no Brasil
Autor(es):	Reis, Ailton Boiteux, Leonardo Silva Lima, Milton Luiz da Paz
Assunto:	Etiologia Oídio Plantas ornamentais - doenças e pragas
Data de publicação:	2007
Editora:	Grupo Paulista de Fitopatologia
Referência:	REIS, Ailton; BOITEUX, Leonardo Silva; PAZ-LIMA, Milton Luiz. Powdery mildew of ornamental species caused by Oidiopsis haplophylli in Brazil. Summa Phytopathologica, Botucatu, v. 33, n. 4, p. 405-408, 2007. DOI: https://doi.org/10.1590/S0100-54052007000400015. Disponível em: https://www.scielo.br/j/sp/a/sz4bYSkFcPF9krtCDV5Xz3n/?lang=en#. Acesso em: 10 jul. 2021.
Abstract:	Oidiopsis haplophylli (syn. Oidiopsis sicula) was identified as the causal agent of powdery mildew diseases occurring on five ornamental species in Brazil. This disease was observed in plastic house-grown lisianthus (Eustoma grandiflorum: Gentianaceae), in nasturtium (Tropaeolum majus: Tropaeolaceae) cultivated under open field conditions and in greenhouse-grown calla lily (Zantedeschia aethiopica: Araceae), impatiens (Impatiens balsamina: Balsaminaceae) and balloon plant (Asclepias physocarpa: Asclepiadaceae). Typical disease symptoms consisted of chlorotic areas on the upper leaf surface corresponding to a fungal colony in the abaxial surface. With the disease progression, these chlorotic areas eventually turned to necrotic (brown) lesions. Fungi morphology on all hosts was similar to that described for the imperfect stage of Leveillula taurica (O. haplophylli). The Koch's postulates were fulfilled by inoculating symptom-free plants via leaf-to-leaf contact with fungal colonies. Additional inoculations using an isolate of O. haplophylli from sweet pepper (Capsicum annuum) demonstrated that it is pathogenic to all five species belonging to distinct botanical families, indicating lack of host specialization. This is the first formal report of a powdery mildew disease on lisianthus, calla lilly, impatiens and nasturtium in Brazil. It is, to our knowledge, the first report of O. haplophyllii infecting A. physocarpa, extending the host range of this atypical powdery mildew-inducing fungus. This disease might become important on these ornamental crops especially in protected cultivation and also under field conditions in hot and dry areas of Brazil.
Licença:	Summa Phytopathologica - This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY NC). Fonte: https://www.scielo.br/j/sp/a/sz4bYSkFcPF9krtCDV5Xz3n/?lang=en#. Acesso em: 10 jul. 2021.
DOI:	https://dx.doi.org/10.1590/S0100-54052007000400015
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