Morphological, molecular phylogenetic and pathogenic analyses of <i>Erysiphe</i> spp. causing powdery mildew on cashew plants in Brazil

Fonseca, Wéverson Lima; Cardoso, J. E.; Ootani, Márcio Akio; Brasil, S. O. S.; Assunção, F. S.; Lima, Cristiano Souza; Viana, F. M. P.; Muniz, Celli Rodrigues; Andrade, Israel L. De; Martins, M. V. V.

doi:10.1111/ppa.13032

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…Erysiphe appeared as the second most frequently reported fungal genus, with two species recently reported in cashew in Brazil: E. quercicola [40][41][42] and E. necator [42]. Cashew powdery mildew (CPM) has been considered a minor disease that affects young leaves, inflorescences, and nuts, reducing fruit onset and severely damaging apple and kernels [40].…”

Section: Powdery Mildewmentioning

confidence: 99%

Disease-Causing Agents in Cashew: A Review in a Tropical Cash Crop

Monteiro

Romeiras²,

Barnabé³

et al. 2022

Agronomy

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Due to the high market value of cashew nut, cashew became a significantly important cash crop in many countries. Originating from Brazil, the plant was introduced into Africa, India, and Southeast Asia and is nowadays found across most of the tropical regions. However, the diseases that threaten and compromise crop production have not yet been comprehensively documented. The aim of this study was to examine the published scientific data on cashew diseases, to identify current knowledge gaps, and to present a review of the most important diseases and pathogens affecting cashew productivity. The most described diseases are caused by fungi genera—mainly Colletotrichum, Lasiodiplodia, and Erysiphe (worldwide); Cryptosporiopsis (East Africa); and recently Fusarium in Tanzania. Other fungal genera (e.g., Septoria, Pilgeriella, and Pestalotia) may correspond to emerging local cashew diseases that have not yet expanded to other geographic regions or for which records are lacking. Gummosis (Lasiodiplodia spp.), which is considered the most prevalent and damaging disease of cashew, has a pantropical distribution. There is large discrepancy concerning the causal agents of cashew diseases that might be explained by the lack of proper species identification through morpho-cultural and molecular approaches. This, in turn, can easily lead to misdiagnoses that have serious negative consequences for the implementation of specific control actions. It is important to establish a standardized identification workflow that will allow a reliable identification of the disease-causing agent and to determine the occurrence and/or expansion of a given pathogen across cashew-producing regions.

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Section: Powdery Mildewmentioning

confidence: 99%

Disease-Causing Agents in Cashew: A Review in a Tropical Cash Crop

Monteiro

Romeiras²,

Barnabé³

et al. 2022

Agronomy

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“…quercicola causing powdery mildew in cashew trees in Brazil (Cardoso et al, 2017), although it has already been reported as the cause of epidemics verified in Tanzania (Limkaisang et al, 2006). In another later study carried out by Fonseca, Cardoso, Ootani, Brasil, et al (2019) based on morphological, phylogenetic and pathogenic analyses, it was shown that two species are associated with cashew powdery mildew: E. quercicola , which infects young immature tissues such as young leaves, flowers and young fruits, and E. necator , which infects mature and shaded leaf tissues. This same study reported the first occurrence of both E .…”

Section: Introductionmentioning

confidence: 98%

Alternative hosts of Erysiphe quercicola in the Brazilian cashew ecosystem

et al. 2022

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Powdery mildew is currently the most important disease of the cashew plant across all producing regions of Brazil. A recent study reported the occurrence of Erysiphe quercicola as the causal agent of the symptoms on leaves, inflorescences, pseudofruits and kernels. Morphological evidence raised the question of whether different hosts of the fungus occur in areas near to cashew orchards. This study was developed to compare the fungi that cause powdery mildew in plants in the cashew ecosystem in order to understand the host relationships, and raising the possibility that alternative hosts are involved in the epidemics verified in the cashew tree. The work consisted of collecting samples of plants with symptoms of powdery mildew and carrying out morphological, phylogenetic and cross‐pathogenicity analysis of the fungal pathogens. The results of this characterization showed that annatto (Bixa orellana), sombrero (Clitoria fairchildiana) and mango (Mangifera indica) are possible alternative hosts of E. quercicola pathogenic to cashew and can therefore represent a source of inoculum for cashew powdery mildew. In addition, the occurrence of this pathogen in mango in Brazil was identified for the first time.

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