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e Podosphaera perseae-americanae on Persea americana A: Symptoms. BeE: Conidiophores. F: Conidia. G: Germ tube. Bars: BeE 50 mm; F, G 20 mm.
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An asexual stage of powdery mildew was found on Persea americana in West Java and North Sumatera, Indonesia. Based on phylogenetic analyses as well as morphological investigations, a new species, Podosphaera perseae-americanae, is proposed for this fungus including detailed descriptions and illustrations of morphology. Also its generic affinity and...
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Citations
... Indonesia merupakan salah satu negara penghasil tanaman alpukat atau nama latinnya disebut Persea Americana. Indonesia juga berada di posisi ke empat negara penghasil alpukat terbesar di dunia [1]. Mengingat Indonesia merupakan negara yang masuk sepuluh besar penghasil alpukat terbesar di dunia. ...
The problem in this study is that the selection of avocado cultivation land still uses the method and does not use a computer-based system to choose avocado cultivation priorities. Because it has not used a computer-based system to choose land priorities, the purpose of this study is to build a system by implementing a decision support system for selecting avocado cultivation land using the Additive Ratio Assessment (ARAS) method. The criteria parameters used to choose alternative avocado cultivation land consist of temperature, rainfall, dry month length, soil texture, and drainage. The use of these 5 criteria can choose the priority of avocado cultivation land. The results of the application of the system, that of the 7 alternative lands are in the top priority with rank 1, namely Tanah Grogot land with a Ki value of 0.895 based on the analysis of the calculation of the Additive Ratio Assessment (ARAS) method. From these results, the implementation of a decision support system using the Additive Ratio Assessment (ARAS) method can be used as the best solution for selecting priority areas for avocado cultivation.
... A escala mundial, se han reportado diversas enfermedades de origen fúngico afectando al cultivo de aguacate; tales como antracnosis en frutos y ramas (Colletotrichum spp.) (Silva-Rojas y Ávila-Quezada, 2011), cancro y muerte descendente de ramas y brotes (Familia Botryosphaeriaceae) (Valencia et al., 2019), cenicilla (Podosphaera persea-americanae) (Siahaan et al., 2016), manchas (Mycosphaerella perseae, Phyllachora gratissima, Pseudocercospora purpurea) (Marais, 2004;Dann et al., 2013), pudriciones de raíz y pedúnculo (Armillaria spp., Calonectria ilicicola, Fusarium spp., Phomosis sp. Rosellinia necatrix; Verticllium spp.) (Dann et al., 2013;Twizeyimana et al., 2013Arjona-Girona et al., 2017Elías-Román et al., 2018), tristeza del aguacate (Phythophthora cinnamomi) (Ramírez-Gil et al., 2016), entre otras. ...
Un esfuerzo coordinado por CODESIN zona centro norte, en el 2019, en conjunto con el CIIDIR-IPN Unidad Sinaloa, CESAVESIN y productores cooperantes, permitió realizar un proyecto de investigación para establecer y monitorear huertos piloto de aguacate de al menos tres variedades comerciales con los objetivos de conocer el desempeño de las variedades Hass, Hass-Méndez y San Miguel, en seis distintos huertos ubicados en la zona centro norte de Sinaloa, durante los dos primeros años de vida de los árboles. Este proyecto permitió descubrir aquellos factores críticos para el crecimiento del cultivo, así como recoger experiencias, generar propuestas preventivas y de manejo, que permitan establecer futuros huertos productivos, con una mayor certeza. El presente documento recopila todas las experiencias adquiridas y conocimiento generado en el proyecto mencionado, que en conjunto con las experiencias de productores de distintos países, permiten aumentar las posibilidades de generar un cultivo viable y rentable en la región centro norte de Sinaloa. Cabe mencionar también que el alcance de este manual está limitado al establecimiento del cultivo y desarrollo de los dos primeros años de vida del huerto. No se tienen aún evidencias de la fase productiva de los árboles, que permitan sugerir estrategias de manejo de frutos en el árbol ni estimar aún rendimientos de producción por hectárea. A pesar de lo anterior, este manual resultará muy útil para productores con la intención de cultivar aguacate y, con base a reportes de productividad en otros estados, en los últimos capítulos de este documento se presentan estimaciones de costos y rentabilidad del cultivo.
... For example, the clade of Leveillula was included as an inner group for Phyllactinia spp. and Pleochaeta formed a clade with Queirozia (Meeboon, Kokaew, & Takamatsu, 2018;Takamatsu et al., 2016). The phylogenetic relationships among the genera of Phyllactinieae published to date have been associated with low statistical support or were estimated from somewhat biased taxon sampling. ...
... In addition, the phylogenetic tree using the LSU sequences showed that Podosphaera spp., other than Podosphaera persaeamericanae, Cystotheca, and Sawadaea, each formed a monophyletic group and generally supported the genus classification in Cystotheceae (Fig. 7). Similar to the result of (Siahaan, Hidayat, Kramadibrata, Meeboon, & Takamatsu, 2016), Podosphaera persaeamericanae was located in the outermost position of the Cystotheceae clade, independent from other Podosphaera spp. In the original description, the affiliation of this species with Podosphaera has been regarded as a temporary treatment ( (Siahaan, Hidayat, Kramadibrata, Meeboon, & Takamatsu, 2016)), and further discussion is necessary regarding its genus classification including that of Takamatsuella. ...
... Similar to the result of (Siahaan, Hidayat, Kramadibrata, Meeboon, & Takamatsu, 2016), Podosphaera persaeamericanae was located in the outermost position of the Cystotheceae clade, independent from other Podosphaera spp. In the original description, the affiliation of this species with Podosphaera has been regarded as a temporary treatment ( (Siahaan, Hidayat, Kramadibrata, Meeboon, & Takamatsu, 2016)), and further discussion is necessary regarding its genus classification including that of Takamatsuella. This study confirmed that the Parauncinula lineage diverged early in Erysiphaceae, consistent with the result of a previous study (Figs. 1, 6;(Mori, Sato, & Takamatsu, 2000)) and confirmed that this genus is a notable group to discuss the early evolution of Erysiphaceae. ...
The classification system and evolutionary history of Erysiphaceae have been studied based on the results of molecular phylogenetic analyses. However, the sequence data used for these phylogenetic estimations have been limited to the nrDNA of ca., 50 taxa, and the relationships among higher taxonomic groups are not well understood. To provide a phylogenetic overview of Erysiphaceae, we performed phylogenetic estimations based on nrDNA and MCM7 sequences obtained from ca., 270 taxa. The phylogenetic tree showed a similar topology to the trees obtained in previous studies, although the branching order between Golovinomyceteae and Phyllactinieae was different and Phyllactinieae was not monophyletic. Phyllactinieae and Erysipheae were estimated to diversify after the divergence of Golovinomyceteae, suggesting an evolutionary trend in which non-catenate conidia + endoparasitic or non-catenate conidia + ectoparasitic lineages were derived from catenate conidia + ectoparasitic lineages. Phyllactinieae was divided into a clade of Phyllactinia + Leveillula and other clade(s) consisting of Pleochaeta and Queirozia. The phylogenetic hypothesis of Erysiphaceae was updated based on the largest dataset to date, but the higher-level phylogenetic relationships remain unclear. For a more robust phylogenetic hypothesis of Erysiphaceae, further sequence data, including protein coding regions, should be added to the dataset of nrDNA sequences.
Powdery mildews are important obligate biotrophic ectoparasites that cause severe damage to various plant species in Southeast Asia. So far, 14 genera and 96 species of powdery mildew have been reported in Southeast Asia, with Thailand having the most number of recorded species. Of the 14 genera reported, Oidium sp. had the most recorded host, including several important species of vegetables, fruits, vines, herbs, field crops, ornamentals, and tree species. This paper briefly reviews the knowledge of powdery mildew disease in Southeast Asia, focusing on the pathogens' host range, impact, and some sources of resistance to powdery mildew.
