White-thread blight: five new hosts in the state of pará, brasil

Benchimol, R. L.; Poltronieri, L. S.; Trindade, D. R.; Albuquerque, F. C. de

doi:10.1590/s0100-41582001000400017

Cited by 12 publications

(4 citation statements)

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“…The changes in population size would have occurred in local pathogen populations infecting native plant species. The incidence of WTBR in several native plant species from the Amazon ( Lourd and Alves, 1987 ; Gasparotto and Silva, 1999 ; Benchimol et al , 2001 ) supports the hypothesis of a local origin for the populations of Ceratobasidium from persimmon and/or tea. Indeed, we have detected two ITS-5.8S rDNA haplotypes in the Camellia -associated clade of Ceratobasidium that were similar to haplotypes detected in soursop and mango isolates from the Amazon.…”

Section: Discussionmentioning

confidence: 64%

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Evidence that the Ceratobasidium-like white-thread blight and black rot fungal pathogens from persimmon and tea crops in the Brazilian Atlantic Forest agroecosystem are two distinct phylospecies

et al. 2012

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The white-thread blight and black rot (WTBR) caused by basidiomycetous fungi of the genus Ceratobasidium is emerging as an important plant disease in Brazil, particularly for crop species in the Ericales such as persimmon (Diospyros kaki) and tea (Camellia sinensis). However, the species identity of the fungal pathogen associated with either of these hosts is still unclear. In this work, we used sequence variation in the internal transcribed spacer regions, including the 5.8S coding region of rDNA (ITS-5.8S rDNA), to determine the phylogenetic placement of the local white-thread-blight-associated populations of Ceratobasidium sp. from persimmon and tea, in relation to Ceratobasidium species already described world-wide. The two sister populations of Ceratobasidium sp. from persimmon and tea in the Brazilian Atlantic Forest agroecosystem most likely represent distinct species within Ceratobasidium and are also distinct from C. noxium, the etiological agent of the first description of white-thread blight disease that was reported on coffee in India. The intraspecific variation for the two Ceratobasidium sp. populations was also analyzed using three mitochondrial genes (ATP6, nad1 and nad2). As reported for other fungi, variation in nuclear and mitochondrial DNA was incongruent. Despite distinct variability in the ITS-rDNA region these two populations shared similar mitochondrial DNA haplotypes.

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Section: Discussionmentioning

confidence: 64%

“…& Arg.] and several other tree species ( Fawcett, 1914 ; Rosseti et al , 1982 ; Furtado, 1997 ; Pereira et al , 2000 ; Benchimol et al , 2001 ). WTBR has also been reported to affect several tree crops worldwide and occurs on most continents.…”

Section: Introductionmentioning

confidence: 99%

Evidence that the Ceratobasidium-like white-thread blight and black rot fungal pathogens from persimmon and tea crops in the Brazilian Atlantic Forest agroecosystem are two distinct phylospecies

et al. 2012

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“…This seems to be the case for secondary pathogens that have likely not been studied in depth. For instance, some multihost fungal pathogens such as Mycena citricolor, causal agent of American leaf spot disease; Corticium koleroga, causal agent of thread blight; and C. salmonicolor, causal agent of pink disease have been consistently reported to prefer agroforestry systems, hypothetically due to longer foliar wetness duration (Avelino et al 2007;Belachew et al 2015;Cerdán et al 2012;Schroth et al 2000;Waller et al 2007), and the availability of more plant hosts, including some tree species commonly used in coffee-based agroforestry systems (Benchimol et al 2001;Roux and Coetzee 2005;Sequeira 1958;Waller et al 2007). Similarly, Armillaria spp.…”

Section: Coffee Diseases In Agroforestry Systemsmentioning

confidence: 99%

Tree Effects on Coffee Leaf Rust at Field and Landscape Scales

et al. 2023

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While integrating trees into agricultural systems (i.e., agroforestry systems) provides many valuable ecosystem services, they can also interact with plant diseases. We demonstrate that a detailed understanding of how plant diseases interact with trees in agroforestry systems is necessary to identify key tree canopy characteristics, leaf traits, spatial arrangements, and management options that can help control plant diseases at different spatial scales. We focus our analysis on how trees affect coffee leaf rust, a major disease impacting one of the world’s most significant crop commodities. We show that trees can both promote and discourage the development of coffee leaf rust at the plot scale via microclimate modifications in the understory. Based on our understanding of the role of tree characteristics in shaping the microclimate, we identify several canopy characteristics and leaf traits that can help manage coffee leaf rust at the plot scale: namely, thin canopies with high openness, short base height, horizontal branching, and small, dentate leaves. In contrast, at the edge of coffee farms, having large trees with high canopy volume and small, thick, waxy leaves is more useful to reduce throughflow wind speeds and intercept the airborne dispersal of urediniospores, an important consideration to control disease at the landscape scale. Seasonal pruning can help shape trees into the desired form, and trees can be spatially arranged to optimize desired effects. This case study demonstrates the added value of combining process-based epidemiology studies with functional trait ecology to improve disease management in agroforestry systems.

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“…The disease is worldwide in distribution and in the Amazon where cocoa tree originated, it has been reported on several important plant species including 18 native fruit trees (Gasparotto and Silva, 1999). The disease has wide host range and is found on economically important trees crops some of which are also found in cocoa farms as fruit crop or shade trees (Benchimol, et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

White thread blight disease caused by Marasmiellus scandens (Massee) Dennis Reid on cocoa and its control in Ghana

Amoako-Attah¹,

Akrofi²,

Hakeem³

et al. 2016

Afr. J. Agric. Res.

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White thread blight disease (WTBD) is currently emerging as an important foliar disease on cocoa in Ghana. The disease has been known in the country for many years. Yet, the incidence and severity levels on cocoa in the growing regions are not known. Surveys and sampling were conducted between 2011 and 2013 to estimate incidence and severity of WTBD in the six cocoa growing regions (Ashanti, Brong-Ahafo, Central, Eastern, Western and Volta) of Ghana. Diseased samples were assayed for the infecting fungus and its identification. Chi square tests were used to find relationships between age, sanitation practice and the disease severity. Effectiveness of chemical and cultural control methods against the disease were tested. The disease was found in all the cocoa growing regions of Ghana and out of 24,000 trees inspected, 1,281 (5.3%) were infected. The majority of infected trees (74.2%) were moderately affected but 3.2% of the trees were very severely affected and almost dead. A positive correlation (r = 0.889) was found between WTBD incidence and the severity. The most severely affected regions were Ashanti (13.8%), Brong-Ahafo (10.2%) and Western (7.6%) regions. Poor maintenance significantly (p=0.0001) increased the levels of disease occurrence and severity. Older cocoa trees also appeared more susceptible than younger ones. Pruning of affected branches controlled the disease better than fungicides spray. However, Nordox (75% copper (I) oxide) at 5 g/l and Metalm (12% metalaxyl and (60% copper (I) oxide) at 3.3 g/l fungicides were effective in reducing mycelial growth of the Marasmiellus fungus. Therefore, fungicide should be used in situations of severe infection to supplement pruning.

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White-thread blight: five new hosts in the state of pará, brasil

Cited by 12 publications

References 0 publications

Evidence that the Ceratobasidium-like white-thread blight and black rot fungal pathogens from persimmon and tea crops in the Brazilian Atlantic Forest agroecosystem are two distinct phylospecies

Evidence that the Ceratobasidium-like white-thread blight and black rot fungal pathogens from persimmon and tea crops in the Brazilian Atlantic Forest agroecosystem are two distinct phylospecies

Tree Effects on Coffee Leaf Rust at Field and Landscape Scales

White thread blight disease caused by Marasmiellus scandens (Massee) Dennis Reid on cocoa and its control in Ghana

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