Abstract
The camphor tree (Cinnamomum camphora (L.) J.) (Lauraceae) is used for industrial and pharmaceutical purposes, and also an evergreen shade tree (Singh and Jawaid, 2012). In 2016, intense defoliation and reduced seedling development was observed in camphor plants showing signs of powdery mildew in the municipality of Capao do Leao, Rio Grande do Sul, Brazil. White to gray rounded irregular patches, consisting of conidia and mycelia of the fungus were observed primarily on the adaxial surface of the leaves of camphor seedlings. When the disease was severe, the entire leaf surface was colonized by the pathogen, resulting in leaf necrosis and defoliation. For Koch's postulates, five healthy seedlings were inoculated on their adaxial surface using an eyelash brush to place conidia on the leaf surface (10 to 15 conidia cm-2). Five non-inoculated seedlings served as controls. Inoculated and non-inoculated seedlings were kept in a greenhouse, but in a separate compartment, with relative humidity around 80% and te...
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