Fig 1 - uploaded by Wagner A. Vendrame
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Potted dendrobium plants showing all stages of cercospora disease development, yellow lesions on leaf surfaces, chlorotic, and necrosis.
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... attacks some 100 different types of plants, including both cultivated ones and weeds (Alfieri et al., 1991;Farr et al., 1989;Pirone, 1970). The disease occurred as a severe blight affecting more than 90% of 500 dendrobium potted nursery stock during Spring 2005. Grade and standard qualities were severely reduced due to severe foliage blight (Fig. 1). The purpose of this research was to determine effective methods of control. Five fungicides were evaluated for disease control in a commercial nursery. Treatments and rates, except mancozeb, were applied every 21 d, with first fungicide application on 10 Mar., ending on 10 May, for a total three applications with a CO 2 -driven ...
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... Many diseases caused by fungi, bacteria and viruses can affect the leaf, stem or root of orchids in both seedling and mature stages (Light, 1995;Kawate & Sewake, 2014;Han et al., 2015). Leaf spot diseases of orchid can be caused by plant pathogenic fungi from several genera, including Alternaria, Cladosporium, Cercospora, Colletotrichum, Fusarium, Guignadia, Phyllosticta, Phytophthora, Pseudocercospora and Septoria (Light, 1995;Silva & Pereira, 2007;McMillan et al., 2008;Kawate & Sewake, 2014;Han et al., 2015;Sun et al., 2017). ...
... capitalensis and Pseu. dendrobii (McMillan et al., 2008;Kawate & Sewake, 2014;Han et al., 2015;Sun et al., 2017). There have been no previous reports of N. orchidacearum as a plant pathogen. ...
Leaf spots caused by plant pathogenic fungi are among the main diseases affecting orchid plants worldwide. A leaf spot disease was widespread in a nursery of cattleya orchid (Cattleya lueddemanniana var. lueddemanniana) in Lampang Province, Thailand in 2016. A fungus was isolated from leaf lesions and identified as Neoscytalidium orchidacearum based on morphological characteristics and the identification was confirmed using a molecular phylogenetic analysis of the combined internal transcribed spacer and large subunit regions of ribosomal DNA sequences. The isolated fungus caused spot symptoms on inoculated orchid leaves similar to symptoms observed in the field. This is the first report of orchid leaf spot disease caused by N. orchidacearum.
