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Phytophthora megakarya and P. palmivora are oomycete pathogens that cause black pod rot of cacao (Theobroma cacao), the most economically important disease on cacao globally.While P. palmivora is a cosmopolitan pathogen, P. megakarya, which is more aggressive on cacao than P. palmivora, has been reported only in West and …minipile genus Phytophthora (Kroon et al., 2004; Tyler et al., 2006) is the most common disease of cacao causing global yield losses estimated at 30% (Guest, 2007). In Cameroon, the most widespread species is Phytophthora megakarya Brassier & Griffin (Mfegue, 2012), which is endemic to West Africa and present inFeb 15, 2016 · A phylogenetic tree generated for 119 Phytophthora isolates, based on the 60S ribosomal protein L10 gene and rDNA sequence, verified the PCR-based identification assay and showed high interspecific variation among the species causing black pod. Phytophthora megakarya isolates were uniformly virulent in an assay using susceptible cacao pod husks Phytophthora Megakarya: a review on its status as a pathogen on cacao in West Africa five major diseases of cocoa (T. cacao Lss.), Phytophthora pod rot (black pod), witches broom, swollen shoot virus, vascular streak dieback, and monilia pod. African Crop Sci. J. 23, 67–87.Phytophthora megakarya is a more aggressive pathogen than P. palmivora (Akrofi et al. 2003; Opoku et al. 2000). For example, P. palmivora was the only recognised causative agent of the black pod disease of cocoa in Ghana before 1985, resulting in 30% crop loss (Akrofi et al. 2003).Phytophthora megakarya infection. In order to analyse gene expression in response to P. megakarya inoculations of resistant and susceptible cocoa clones, a time course was conducted from 2 to 96 hpi. To verify the success of infection in plant tissues, half-leaves were conserved in a room culture for 6 days and fungal progression on the cocoa ...The US Nematode Collection Search site is now available here.. We thank you for your patience and apologize for the delays in making the site available again.Phytophthora megakarya (Pmeg) and Phytophthora palmivora (Ppal) cause black pod rot of Theobroma cacao L. (cacao). Of these two clade 4 species, Pmeg is more virulent and is displacing Ppal in many cacao production areas in Africa. Symptoms and species specific sporangia production were compared when the two species were co-inoculated onto pod pieces in staggered 24 h time intervals.Phytophthora megakarya and P. palmivora, Causal Agents of Black Pod Rot, Induce Similar Plant Defense Responses Late during Infection of Susceptible Cacao …T1 - Resistant and susceptible cacao genotypes exhibit defense gene polymorphism and unique early responses to Phytophthora megakarya inoculation. AU - Pokou, Désiré N. AU - Fister, Andrew S. AU - Winters, Noah. AU - Tahi, Mathias. AU - Klotioloma, Coulibaly. AU - Sebastian, Aswathy. AU - Marden, James H. AU - Maximova, Siela N.Phytophthora megakarya is the most virulent Phytophthora species reported on cacao (Theobroma cacao) in Africa. Previous studies have shown that it disperses mainly through rain splash from soil ...The formulation was tested for inhibition of spore germination in Phytophthora megakarya and showed 100% inhibition at 10% (w/v) of formulation. To determine the efficacy of the formulation, we performed an in planta assay in the greenhouse on two hybrids of cocoa seedlings, the tolerant SNK413 × (♂) T79/467 and the susceptible UPA 134× ...Cacao black pod rot (BPR), caused by Phytophthora megakarya is the most important cacao disease in Cameroon. Biocontrol of this disease using an oil-based formulation of Trichoderma asperellum PR11 provided more consistent and long-lasting protection of cacao pods under laboratory and experimental plot conditions. The objective of this study was to test this formulation under farmer field ...Pod rot, caused by several species belonging to the genus Phytophthora, is the main cause of cocoa harvest losses worldwide. Among the methods making up integrated disease management (IDM), the creation of resistant cultivars has been identified as a priority in cocoa breeding research programmes. To that end, various experiments have enhanced knowledge about the genetic basis of resistance to ...Influence du microclimat sur l'installation de Phytophthora megakarya dans une parcelle cacaoyere initialement exempte d'auto inoculum (PDF) Influence du microclimat sur l'installation de Phytophthora megakarya dans une parcelle cacaoyere initialement exempte d'auto inoculum | Gerben Hoopen - Academia.eduEvaluation of the Epidemiological Factors Responsible for the Appearance of Phytophthora Palmivora and Phytophthora Megakarya, Causal Agent of Black Pods Disease in the Department of Méagui, Southwestern Côte D'ivoireThe genus Phytophthora has been studied at the cellular level, suggesting that different developmental steps are induced by the expression of some specific genes. However, these studies have only been carried out on certain species, such as Phytophthora infestans and Phytophthora cactorum. ... Phytophthora megasperma and Phytophthora megakarya ...General information about Phytophthora megakarya (PHYTMG) THIS WEBSITE USES COOKIES Our website uses cookies to ensure that we give you the best possible online experience. We do not use these to store personal information about you.Continuing to use this website means you agree to our use of cookies.Nyassé, S., Despréaux, D., Cilas, C., Validity of a leaf inoculation test to assess the resistance to Phytophthora megakarya in a cocoa (Theobroma cacao L.) diallel mating design, Euphytica 123 (2002) 395 - 399. CrossRef Google ScholarThe expression patterns of pattern recognition receptors (PRRs) and a possible gene-to-gene interaction participate in cocoa resistance to Phytophthora spp. Diseases associated with Phytophthora cause considerable losses in cocoa production worldwide. Analyzing genes, proteins, and metabolites involved in Theobroma cacao’s …In African cacao-producing countries, control of cacao black pod disease caused by Phytophthora megakarya is a priority. Introducing biological control agents as part of a P. megakarya control ...Phytophthora megakarya is an increasingly important invasive pathogen of cocoa in West Africa, where it forms part of the black-pod disease complex together with the more widespread, but less ...The aim of this work was to evaluate the effect of the soil amendment with bio-oyster shell on the stimulation of the cocoa plant defense systems against P. megakarya in the nursery. For this purpose, the potential of bio-oyster shell to stimulate cocoa plant defense mechanisms was evaluated by soil amendment at 1% W/W under greenhouse conditions.Black pod disease of cocoa in West Africa, caused almost exclusively by P. megakarya, still remains one of the most serious constraints on cocoa production. Surveys during the 1978 and 1979 harvest season in Togo revealed losses of up to 80%, when no control measures were taken (Djiekpor et al., 1981). Erwin and Ribeiro (1996) estimated a 20-30 ...Request PDF | Modeling the temporal evolution of cocoa black pod rot disease caused by Phytophthora megakarya | Black pod rot, caused by Phytophthora megakarya, is the main cause of cocoa losses ...Depending on the site, PR11 was able to reduce percentage pod rot between 13 and 34% whereas the combination of PR11 and Kocide reduced pod rot by 48% in one instant, demonstrating the potential for integrated control using fungicide and fungicide-BCA combinations. Control of Phytophthora megakarya, the causal agent of cocoa black pod in Cameroon is commonly obtained by fungicide spraying of ...Phytophthora megakarya (Pmeg) and Phytophthora palmivora (Ppal) cause black pod rot of Theobroma cacao L. (cacao). Of these two clade 4 species, Pmeg is more virulent and is displacing Ppal in many cacao production areas in Africa. Symptoms and species specific sporangia production were compared when the two species were co-inoculated onto pod pieces in staggered 24 h time intervals.Jan 31, 2007 · Phytophthora megakarya is an important pathogen of cocoa in Africa. We used isozyme and RAPD markers to estimate the genetic diversity and structuring among 161 isolates, from the known ... Phytophthora megakarya (Pmeg) and Phytophthora palmivora (Ppal) cause black pod rot of Theobroma cacao L. (cacao). Of these two clade 4 species, Pmeg is more virulent and is displacing Ppal in ...Phytophthora megakarya (Pmeg) and Phytophthora palmivora (Ppal) are closely related species causing cacao black pod rot. Although Ppal is a cosmopolitan pathogen, cacao is the only known host of ...Cacao black pod rot (BPR), caused by Phytophthora megakarya is the most important cacao disease in Cameroon. Biocontrol of this disease using an oil-based formulation of Trichoderma asperellum PR11 provided more consistent and long-lasting protection of cacao pods under laboratory and experimental plot conditions. The objective of this study was to test this formulation under farmer field ...Phytophthora brassicaein was reported to be closed link to sulfur statute of the plant [12]. Hence, sulfur containing molecules can be associated toT.cacao selection for tolerance againstP.megakarya. The present work aims to study the implication of cysteine and myrosinase inT.cacao defense againstP.megakarya and their potential use in the ...General information about Phytophthora megakarya (PHYTMG) on EPPO Q-Bank DatabasePhytophthora megakarya is an oomycete plant pathogen that causes black pod disease in cocoa trees in west and central Africa. This pathogen can cause ...Black pod disease caused by Phytophthora megakarya is the most important fungal disease on cocoa in Ghana. The current recommended control method of combining sanitation practices with 6 - 8 ...(Phytophthora palmivora and Phytophthora megakarya) commonly found in Ivorian cocoa plots and which cause significant damage. Despite numerous studies, this disease continues to spread and even more so Phytophthora megakarya, which did not exist in Côte d'Ivoire, is beginning to spread significantly. This study focused on thePhytophthora palmivora and Phytophthora megakarya exist, with P. megakarya been the most damaging species for the cocoa industry. Although P. megakarya only exists in Africa, the species P. palmivora and P. capsici are responsible for the disease in South America [21]. Data of economic losses incurred from theStudying spatial and temporal plant disease dynamics helps us to understand pathogen dispersal processes and improve disease control recommendations. In this study, three cacao plots devoid of primary inoculum of <i>Phytophthora megakarya</i> (causal agent of cacao black pod rot disease) upon establ … In Cameroon, black pod disease caused by Phytophthora megakarya is one of the most economically destructive diseases of cocoa. Hybridation is a reliable method of ameliorating cocoa production.Bioassay of Geniculosporium species for Phytophthora megakarya biological control on cacao pod husk piecesIn African cacao-producing countries, control of cacao black pod disease caused by Phytophthora megakarya is a priority. Introducing biological control agents as part of a P. megakarya control strategy is highly desirable, especially in a perspective of pesticide reduction.Trichoderma species are among the most used biological control …Phytophthora species produce a protein that has a similar sequence to the NEP1 of Fusarium oxysporium. Multiple copies of NEP1 orthologues have been identified in a P. megakarya strain and in four other Phytophthora species (P. citrophthora, P. capsici, P. palmivora and P. sojae) (Bae et al., 2005). Phytophthora megakarya is an oomycete plant pathogen that causes black pod disease in cocoa trees in west and central Africa. This pathogen can cause detrimental loss of yield in the economically important cocoa industry, worth approximately $70 billion annually. [2]Phytophthora megakarya Taxonomy ID: 4795 (for references in articles please use NCBI:txid4795) current name. Phytophthora megakarya. type material of Phytophthora megakarya: ATCC:42100, CBS:238.83, IMI:202077. NCBI BLAST name: downy mildews Rank: species Genetic code: Translation table 1 (Standard)Phytophthora megakarya is a(n) research topic. Over the lifetime, 121 publication(s) have been published within this topic receiving 2295 citation(s). Popular works include Taxonomy of 'Phytophthora palmivora' on cocoa, Isolation and identification of mycoparasitic isolates of Trichoderma asperellum with potential for suppression of black pod disease of cacao in Cameroon and more.Phytophthora megakarya and P. palmivora, closely related causal agents of cacao black pod rot, underwent increases in genome sizes and gene numbers by different mechanisms.In Cameroon, Phytophthora megakarya is the causal agent of black pod rot of cacao (Theobroma cacao L). Primary inoculum of P. megakarya is located in the soil. With the onset of the rainy season, this primary inoculum is activated and through rain splash cacao pods become infected. From there repeated cycles of pod infection, sporulation, spore ...Variation in resistance of the cocoa genotypes. The reaction of the 12 cocoa genotypes used as parents in this study to P. palmivora and P. megakarya is presented in (Table 1).Significant differences (p < 0.001) in mean severity values were observed among the genotypes in the inoculation tests (pod lesion number (PLN), pod lesion size (PLS) and leaf disc score (LDS)).Phytophthora megakarya is an oomycete plant pathogen that causes black pod disease on cocoa trees in West and Central Africa. This pathogen can cause detrimental yield losses in the economically important cocoa industry worth about $70 billion annually. It can damage any part of the tree and cause total yield loss, which can easily reach 20-25%.Phytophthora megakarya and Phytophthora palmivora, closely related causal agents of cacao black pod rot, underwent increases in genome sizes and gene numbers by different mechanisms. Genome Biol Evol. 9(3): 536 – 557. doi: 10.1093/gbe/evx021 , [Web of Science ®], [Google Scholar] Anderson RG, Deb D, Fedkenheuer K, McDowell JM. 2015. Phytophthora megakarya est responsable de la pourriture brPhytophthora megakarya is characterized by the shape of th These data might mean that MgSO4 nutrition significantly improved the tolerance of T. cacao. The mechanism of tolerance improvement might be associated with the synthesis of sulphur-containing compounds (cysteine and glutathione) which might be directly or indirectly used by T. cacao against P. megakarya. Phytophthora megakarya and P. palmivora are oomycete pathoge PDF | Phytophthora megakarya is the most virulent Phytophthora species reported on cacao (Theobroma cacao) in Africa. Previous studies have shown that... | Find, read and cite all the research you ... The arrival and subsequent dispersal of ...

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Cocoa (Theobroma cacao L.) black pod rot, caused by oomycetes Chromista Phytophthora megakarya is th...

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Phytophthora megakarya is restricted to Cameroon, Nigeria, Togo, and Ghana, causing about 10...

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Phytophthora megakarya is restricted to countries of West and Central Africa and considered to be a signi...

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Phytophthora megakarya appears to be confined to West Africa (Zentmeyer, 1987), where it is the most...

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cocoa-tree and the biocontrol of Phytophthora megakarya, which is the most aggressive agent of black pod d...

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