Phytophthora megakarya. Nana WL, Eke P, Fokom R, Bakanrga-Via I, Begoude D, T...

The study by Zhu et al. reports that the Phytophthora soja

Phytophthora megakarya is restricted to Cameroon, Nigeria, Togo, and Ghana, causing about 10 percent crop loss. Phytophthora capsici parasitizes cocoa in Central and South America. It is the predominant cause of pod rot in Brazil where it is less aggressive than Phytophthora palmivora. Phytophthora citrophthora also attacksIntroduction Cacao ( Theobroma cacao L.) is a perennial plant native to the Amazon region belonging to the family Malvaceae, and it is of great socioeconomic …Identification of Theobroma cacao genes differentially expressed during Phytophthora megakarya infection . × Close Log In. Log in with Facebook Log in with Google. or. Email. Password. Remember me on this computer. or reset password. Enter the email address you signed up with and we'll email you a reset link. Need an account? ...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 …Pathogens of the Straminipile genus Phytophthora cause significant disease losses to global cocoa production. P. megakarya causes signifi-cant pod rot and losses due to canker in West Africa, whereas P. capsici and P. citrophthora cause pod rots in Central and South America. The global and highly damaging P. palmivora attacks all parts of the cocoaEnhance cocoa seedling growth and resistance against Phytophthora megakarya with oyster shell powder soil amendment. Increase plant height, leaf number, ...Control of Phytophthora megakarya, the causal agent of cocoa black pod in Cameroon is commonly obtained by fungicide spraying of either copper compounds or a mixture of metalaxyl-M with copper ...Diseases are a major production constraint wherever cocoa (Theobroma cacao) is grown. The principal method of ameliorating cocoa production is the use of hybrid clones, which have resistance to important diseases and high productivity. To select new genotypes with resistance to Phytophtora megakarya, the cause of the destructive black pod disease, …Bblack pod rot^ caused by an Oomycete Phytophthora megakarya (Ndoumbé-Nkeng et al. 2004). Its symptoms are the appearance on the surface of the pod of a small, Eur J Plant Pathol (2017) 147:579-590General 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.Crude extracts from Thevetia neriifolia seeds after maceration in different organic solvents were reported to inhibit the development of Phytophthora megakarya, a causal agent of black pod disease ...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 book reviews the current state of knowledge concerning cacao pathogens and methods for their management. Topics discussed include the history, biology and genetic diversity of Moniliophthora species (which cause witches' broom and frosty pod rot) and Phytophthora species (which cause black pod rot) that cause diseases resulting in major losses to cacao production.Disease progression. To study the responses of a resistant and a susceptible cacao genotypes to inoculation with Phytophthora megakarya zoospores, young plants were spray inoculated with zoospores or with distilled water as a control. Our strategy was to capture gene expression profiles in the very early stages of infection, to identify disease …Jul 31, 2022 · Phytophthora megakarya is a 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. It can damage any part of the tree, causing a wide range in the reduction of yield. A mi lorsqu'elles infectent les cabosses. Phytophthora megakarya est la plus agressive et peut provoquer entre 60 % et 100 % des pertes de récoltes (Luterbacher et al., 1993, Berry and Cilas, 1994), Opoku et al., 2000), quand les conditions favorisent le développement de la maladie. En revanche, P . palmivora est moins agressif et peut entrainer desCocoa (Theobroma cacao L.) black pod rot, caused by oomycetes Chromista Phytophthora megakarya is the major constraint to cocoa production in Cameroon, causing substantial yield losses (up to 100%). As mean to alter the yield shortage, priority is given to chemical fungicides, though Arbuscular Mycorrhizals Fungi (AMF) have been pointed out to ...Validity of a leaf inoculation test to assess the resistance to Phytophthora megakarya in a cocoa (Theobroma cacao L.) diallel mating design . × Close Log In. Log in with Facebook Log in with Google. or. Email. Password. Remember me on this computer. or reset password. Enter the email address you signed up with and we'll email you a reset linkPhytophthora megakarya is the most destructive fungal pathogen on cocoa production in Ghana [13]. The disease has been in Ghana for many years but on other alternative hosts [16]. It was ...spesies Phytophthora telah berhasil diisolasi dari tanaman kakao sakit di seluruh dunia, ... yaitu P. palmivora, P. megakarya dan P citropthora yang menimbulkan kerugian paling besar pada kakao ...1 A new oil-based formulation of Trichoderma asperellum for the biological control of cacao black pod disease caused by Phytophthora megakarya J.B. Mbarga a,b, B.A.D Begoude a, Z. Ambangb, M. Meboma , J. Kuate , B. Schiffersc, W. Ewbankd, Laurence Dedieue, Martijn ten Hoopena,f,* a Laboratoire Régional de Lutte Biologique et de Microbiologie …A specific peroxidase isoform was discovered from the cocoa ( Theobroma cacao L.) hybrids in a study conducted in Cameroon [50] – [52]. Their study focused on the activities and heritability of peroxidases in two hybrid populations of F13 (SNK13 x T79/467) and F79 (T79/467 x SNK13) subjected to Phytophthora megakarya.Phytophthora palmivora (E. J. Butler) E. J. Butler (1919) is a cosmopolitan pathogen with a wide host range, including some very important economic crops such as cacao, papaya, black pepper, rubber, coconut, and citrus. The center of origin is believed to be southeastern Asia (McHaw and Coffey, 1994). In 1907, Butler originally described a new ...ABSTRACT Pathogens of the Straminipile genus Phytophthora cause significant disease losses to global cocoa production. P. megakarya causes significant pod rot and losses due to canker in West Africa, whereas P. capsici and P. citrophthora cause pod rots in Central and South America. The global and highly damaging P. palmivora …Black pod rot, caused by Phytophthora palmivora, is a devastating disease of Theobroma cacao L. (cacao) leading to huge losses for farmers and limiting chocolate industry supplies. To understand resistance responses of cacao leaves to P. palmivora, Stage 2 leaves of genotypes Imperial College Selection 1 (ICS1), Colección Castro …Phytophthora palmivora and Phytophthora megakarya are the causes of the most prevalent fungal diseases of cocoa in Ghana and are differentially spread in the country's six cocoa-growing regions (Western, Brong …Black pod disease is caused by several species of Phytophthora. In Cameroon, the disease is mainly due to Phytophtora megakarya. The pathogen attacks cocoa pods and can lead to almost total production losses in a plot if no control measures are applied. To control the disease, several research programmes are being conducted: …most damaging agent, Phytophthora megakarya, is found only in West Africa (20,22,27). Two other new encounter pathogens, CSSV and Oncobasidium theobromae, as well as one that may have coevolved with cacao, Ceratocystis cacaofunesta, also have limited ranges (5,18,41). Safe movement of cacao germplasm. The safe movement ofPhytophthora 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.P. megakarya strains, the inhibition of the strains by the extracts, the minimum inhibiting concentration (MIC 50 and MIC 90 ) and the extract characteristic were determined by the usualCropProtection23(2004)415-424 Impactofremovingdiseasedpodsoncocoablackpodcausedby Phytophthora megakarya andoncocoaproductioninCameroon M.Ndoumbe-Nkenga,C.Cilasb,E ...In Cameroon, loss in cocoa seed production is mainly due to Phytophthora megakarya affections. The genetic improvement by controlledPhytophthora megakarya Brasier & Griffin, is one of the Oomycete pathogens reported on Theobroma cacao, and it is the most virulent of the Phytophthora species that causes black pod disease. Phytophthora megakarya was first reported as the causal agent of black pod disease in 1979 after the reclassification of Phytophthora species recovered from infected cacao tissues.Phytophthora megakarya Brasier & Griffin, is one of the Oomycete pathogens reported on Theobroma cacao, and it is the most virulent of the Phytophthora species that causes black pod disease.Phytophthora megakarya was first reported as the causal agent of black pod disease in 1979 after the reclassification of Phytophthora species recovered from infected cacao tissues.Phytophthora megakarya is restricted to Cameroon, Nigeria, Togo, and Ghana, causing about 10 percent crop loss. Phytophthora capsici parasitizes cocoa in Central and South America. It is the predominant cause of pod rot in Brazil where it is less aggressive than Phytophthora palmivora. Phytophthora citrophthora also attacksPhytophthora 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)Diversity of Phytophthora megakarya in Central and West Africa revealed by isozyme and RAPD markersMany Phytophthora species have a soil borne phase in their natural life cycles even though disease expression often occurs on aerial plant parts. In Cameroon, black pod rot of cacao (Theobroma cacao L.), is caused by P. megakarya. Primary inoculum ofPhytophthora 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. Pmeg ...In this study, three cacao plots devoid of primary inoculum of Phytophthora megakarya (causal agent of. Studying spatial and temporal plant disease dynamics helps to understand pathogen dispersal processes and improve disease control recommendations. In this study, three cacao plots devoid of primary inoculum of Phytophthora megakarya (causal ...Phytophthora megakarya is the most destructive fungal pathogen on cocoa production in Ghana . The disease has been in Ghana for many years but on other alternative hosts [ 16 ]. It was originally identified in Nigeria in 1979 [ 17 ], reported in Togo in 1982 [ 18 ], and was subsequently reported in Ghana in 1985 [ 16 ].Phytophthora parasitica is a soilborne pathogen with a wide range of host plants and represents most species in the genus Phytophthora. In this review, we present some recent progress of P. parasitica research by highlighting important features that make it emerge as a model species of oomycete pathogens. The emerged model pathogen will ...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 is restricted to Cameroon, Nigeria, Togo, and Ghana, causing about 10 percent crop loss. Phytophthora capsici parasitizes cocoa in Central and South America. It is the predominant cause of pod rot in Brazil where it is less aggressive than Phytophthora palmivora. Phytophthora citrophthora also attacksMicrosatellite markers for population studies of Phytophthora megakarya (Pythiaceae), a cacao pathogen in Africa Michael Mbenoun 2012, American Journal of BotanyPhytophthora megakarya was first designated as the species P. palmivora MF3 ( Griffin, 1977) or P. palmivora L type and was described in 1979 as causing a disease of cacao (Brasier and Griffin, 1979). P. palmivora was considered to be the only causal organism of black pod of cocoa. Phytophthora parasitica is a soilborne pathogen with a wide range of host plants and represents most species in the genus Phytophthora. In this review, we present some recent progress of P. parasitica research by highlighting important features that make it emerge as a model species of oomycete pathogens. The emerged model pathogen will ... Phosphonic Acid: an Alternative Approach to the Control of Black Pod Disease of Cocoa Caused by Phytophthora Megakarya; Phytophthora Palmivora Establishes Tissue-Specific Intracellular Infection Structures in the Earliest Divergent Land Plant Lineage; Effect of Storage on the Antimicrobial Potencies of Some Botanicals Against Phytophthora ...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).megakarya, P. capsici, and P. citrophthora [8,9]. Several studies have related genetic information with the phenotypic characteristics of diseases caused ...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 ...Development of necrosis length on leaves and phytochemical characteristics of cocoa genotypes. The reaction of 19 cocoa genotypes (16 hybrids and three parents) to P. megakarya is presented in Table 1.Significant differences (P < 0.05) in lesion size were observed in all the genotypes 2, 4, and 6 days after inoculation (dai) (Fig. 1). 6 dai, smaller necrotic lesions were observed for partial ...The role of tcGASA genes in conferring fungal resistance was also explored based on RNAseq data against Phytophthora megakarya . The differential expression of tcGASA genes was recorded between the tolerant and susceptible cultivars of cacao plants, which were inoculated with the fungus for 24h and 72h. This differential expression …Studying 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 …Phytophthora parasitica is a soilborne pathogen with a wide range of host plants and represents most species in the genus Phytophthora. In this review, we present some recent progress of P. parasitica research by highlighting important features that make it emerge as a model species of oomycete pathogens. The emerged model pathogen will ... Recent research demonstrates that the number of virulent phytopathogenic fungi continually grows, which leads to significant economic losses worldwide. Various procedures are currently available for the rapid detection and control of phytopathogenic fungi. Since 1940, chemical and synthetic fungicides were typically used to control ...Phytophthora species are highly destructive plant pathogens and pose a significant threat to plants in various ecosystems, including agriculture, forest plantations, …Phytophthora palmivora (Butler) is an hemibiotrophic oomycete capable of infecting over 200 plant species including one of the most economically important crops, Theobroma cacao L. commonly known as cocoa. It infects many parts of the cocoa plant including the pods, causing black pod rot disease. This review will focus on P. …Black pod disease is caused by several species of Phytophthora. In Cameroon, the disease is mainly due to Phytophtora megakarya. The pathogen attacks cocoa pods and can lead to almost total production losses in a plot if no control measures are applied. To control the disease, several research programmes are being conducted: breeding for increased resistance, development of several biocontrol ...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 ...The data indicated that Phytophthora species i.e. P. palmivora and P. megakarya were a significant source of variation in the results of the resistance tests. Interaction of the parents and the crosses with the Phytophthora species was not significant, indicating that the cultivars and their crosses did not change their relative ranking across ...Phvytophthora megakarya is a devastating oomycete pathogen that causes black pod disease in cacao. Phytophthora species produce a protein that has a similar sequence to the necrosis and ethylene inducing protein (Nep1) of Fusarium oxysporum. Multiple copies of NEP1 orthologs (PmegNEP) have been iden …1.. IntroductionSeveral Phytophthora species, including P. megakarya Brasier and Griffin, P. palmivora (Butl.) Butler, P. citrophthora (R.H. Sm. and E. Sm.) Leonian, and P. capsici Leonian, attack the tropical tree Theobroma cacao L. (cacao) causing black pod disease. Symptoms include seedling blights, stem cankers, and pod …In this study, three cacao plots devoid of primary inoculum of Phytophthora megakarya (causal agent of cacao black pod rot disease) upon establishment in 2006 were monitored for presence of disease on a weekly basis from 2009 to 2016.Phytophthora megakarya thrives in very humid climates. Although soil texture plays a central role in the epidemiology of some Phytophthora species (Corcobado et al., 2013), there is a dearth of infor-mation on the effect of edaphic factors on the per-sistence of P. megakarya. A sharp contrast exists between weather conditions required for zoosporeP. megakarya (Brasier & Griffin) di . Afrika Barat (Brasier & Griffin, ... Phytophthora nicotianae was a predominant species from pineapple but also found in cabbage, chilli, and chrysanthemum. ...The arrival and subsequent dispersal of Phytophthora megakarya within young cacao plantations, previously free of black pod and containing cacao germplasm that is evaluated for its resistance to P. megakarya, is the subject of an ongoing study in Cameroon. A total of 12 plantations, established in 2006 on lands free of cacao cultivation for at ...Jan 10, 2023 · On the other end, several genome assemblies had high repeat content, namely, P. megakarya, Phytophthora hibernalis, and Phytophthora pinifolia contained 32.94, 32.46, and 33.00%, respectively. Fig. 1. Analysis of 31 Phytophthora species shows an abundance of repetitive elements. Species are shown in phylogenetic clade order; clade designations ... Many Phytophthora species have a soil borne phase in their natural life cycles even though disease expression often occurs on aerial plant parts. In Cameroon, black pod rot of cacao (Theobroma cacao L.), is caused by P. megakarya. Primary inoculum of(From Brasier and Griffin, 1979).P. megakarya is a member of Group II of Phytophthora, as defined by Stamps et al. (1990).It produces caducous papillate sporangia, is heterothallic and antheridia are amphigynous.Sporangia are limoniform, obpyriform or ellipsoid with rounded bases, varying from 20-60 x 13-41 µm, with a length-breadth ratio of 1.2-1.6, and are formed in a sympodium.On-farm farmer managed trials to control black pod disease caused by Phytophthora megakarya in Ghana. Proceedings of the First International Cocoa Pests and Disease Seminar [Internet]. 1995 :pp. 109-118. ... Phytophthora quercetorum sp. nov., a novel species isolated from eastern and north-central USA oak forest soils. Mycological Research ...Phytophthora là một chi Oomycetes gây hại cho cây, các loài trong chi này có thể gây hại kinh tế lớn đối với các vụ mùa trên toàn thế giới cũng như gây tổn môi trường hệ sinh thái tự nhiên. Thành tế bào của Phytophthora được cấu tạo bởi cellulose. Chi này được Heinrich Anton ...Nov 17, 2021 · This datasheet on Phytophthora megakarya covers Identity, Overview, Distribution, Dispersal, Hosts/Species Affected, Diagnosis, Biology & Ecology, Seedborne Aspects, Impacts, Prevention/Control, Further Information. Identity Preferred Scientific Name Phytophthora megakarya Brasier & M.J. Griffin Preferred Common Name black pod of cocoa susceptibility leaf to Phytophthora megakarya. (Singh and Islam, 2010) proving th at the in vitro . culture of P. nicotianae and T. harzianum together . led to a variety of interactions. P. ...General information about Phytophthora megakarya (PHYTMG) on EPPO Q-Bank DatabaseMethods : The artificial inoculation test on leaf discs, was used in this study to assess the susceptibility of 52 clones of high-producing cocoa trees resistant in the field to black podcausing by P. megakarya. Results : Three groups of susceptibility to P. megakarya were demonstrated according to the reference controls. The first group is ...Phytophthora parasitica is a soilborne pathogen with a wide range of host plants and represents most species in the genus Phytophthora. In this review, we present some recent progress of P. parasitica research by highlighting important features that make it emerge as a model species of oomycete pathogens. The emerged model pathogen will .... EFFET DES TRAITEMENTS DU SOL SUR LE DEVELOPAlthough several Phytophthora species can i 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 ... Feb 14, 2017 · Plant materials. To identify infection by Phytophthora megakarya in 20 genotypes of Theobroma cacao L. derived from intercrossing of T79/467 and ICS40 parental clones. Total polyphenols (TPP), total flavonoids (TF) and ...Comparative Assessment of the Resistance of Cocoa (Theobroma cacao L.) Progenies from SNK10 x SNK413; ICS84 x ICS95 to Phytophthora megakarya in Cameroon by ... Phytophthora megakarya is the most virulen...

Continue Reading