Spatial Distribution and Temporal Development of Fusarium Crown and Root Rot of Tomato and Pathogen Dissemination in Field Soil

Rekah, Yael; Shtienberg, D.; Katan, J.

doi:10.1094/phyto.1999.89.9.831

Cited by 59 publications

(65 citation statements)

References 25 publications

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“…Distances between roots were smallest in the zone of highest root density (2-4 cm below stem plates) and roots frequently extended horizontally in this zone, providing a direct route for mycelial growth to other plants. Rekah et al (1999) reported that tomato roots seemed to be essential for movement of the fusarium crown rot and root rot pathogen in soil, and therefore may be regarded as tubes filled with a highly selective and rich habitat protecting the colonising pathogen from the activity of antagonistic micro-organisms. In the CCS pathosystem, the carrot root system was modelled as a single cylinder and possible infections of radicles on the same plant via the taproot were initially ignored (Suffert, 2006).…”

Section: Discussionmentioning

confidence: 99%

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Demonstration of secondary infection by Pythium violae in epidemics of carrot cavity spot using root transplantation as a method of soil infestation

Suffert

Montfort

2007

Plant Pathology

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Cavity spot of carrot (CCS), one of the most important soilborne diseases of this crop worldwide, is characterized by small sunken elliptical lesions on the taproot caused by a complex of pathogens belonging to the genus Pythium , notably P. violae . In most soilborne diseases the soil is the source of inoculum for primary infections, with diseased plants then providing inoculum for secondary infections (both auto-and alloinfection). Using fragments of CCS lesions to infest soil, it was demonstrated that CCS lesions on carrot residues can cause primary infection of healthy roots. Using a novel soil infestation method, in which an artificially infected carrot root (the donor plant) was placed close to healthy roots (receptor plants) the formation of typical CCS lesions were induced more efficiently than the use of classical soil inoculum and showed that CCS can spread from root to root by alloinfection from transplanted diseased roots. The method also demonstrated the polycyclic nature of a CCS epidemic caused by P. violae in controlled conditions. Secondary infections caused symptoms and reduced root weight as early as two weeks after transplantation of the diseased carrot. This reproducible method may be used for delayed inoculation and for studying the effect of cropping factors and the efficacy of treatments against primary and secondary cavity spot infections.

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Section: Discussionmentioning

confidence: 99%

“…radicis-lycopersici (Rekah et al ., 1999(Rekah et al ., , 2001, pea root rot due to Aphanomyces euteiches (Pfender & Hagedorn, 1983), wheat take-all due to Gaeumannomyces graminis var. tritici (Colbach et al ., 1997;Bailey & Gilligan, 1999), and diseases caused by Phytophthora parasitica var.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of secondary infection by Pythium violae in epidemics of carrot cavity spot using root transplantation as a method of soil infestation

Suffert

Montfort

2007

Plant Pathology

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“…Com o diagnóstico sobre a capacidade de dispersão da doença no campo, é concebível o desenvolvimento de programas eficientes de controle da doença na cultura e para outros patógenos com mecanismos semelhantes ao da fusariose no cultivo da pimenta-do-reino (REKAH et al, 1999;IKEDA, 2010).…”

Section: II Ii I Sunclassified

Distribuição Espacial e Temporal da Fusariose em Pimenta-do-Reino

Silva¹,

Neto²,

Herzog³

et al. 2013

Anais Do III Simpósio De Geoestatística Aplicada Em Ciências Agrárias

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Resumo -A pimenta-do-reino é o condimento mais comercializado no mundo e uma cultura de importância sócio econômico regional. A fusariose é uma doença causada pelo fungo Fusarium solani f. sp. piperis (Nectria haematococca f. sp. piperis) e tornou-se o principal problema fitossanitário da pipericultura nacional. Pouco se conhece da dinâmica de suas interações com o ambiente do solo, hospedeiro e estabelecimento da doença. A geoestatística possui ferramentas que permitem conhecer e visualizar a variabilidade espacial, além de correlacionar e associar o mesmo aos fenômenos em estudo, contribuindo para o entendimento das interações patógeno-ambiente-hospedeiro. Sendo assim, o objetivo foi pesquisar e aplicar métodos da geoestatística para compreender a distribuição espacial da fusariose em pimenta-doreino. O experimento foi conduzido no período de 2010 a 2011, na Região Norte do Estado do Espírito Santo. A geoestatistica foi utilizada para constar a dependência espacial das variáveis em estudo, para isso implantou-se uma malha amostral regular de 12.000m 2 e a incidência da doença foi avaliada ao longo de 150 dias. Os mapas da distribuição da doença ao longo do tempo demostraram foco inicial nas bordas da lavoura e os modelos teóricos ajustados dos variogramas, representaram os diferentes estágios da epidemia de fusariose na lavoura de pimenta-do-reino.Palavras-chave: geoestatística; Fusarium solani f. sp. piperis; Piper nigrum L. Spatial and Temporal Distribution of fusarium wilt in Black Pepper CropAbstract -The Fusarium wilt is a disease caused by the fungus Fusarium solani f. sp. piperis (Nectria haematococca f. sp. piperis) and became the main disease problem of national pepper crop. Few reports is known about the dynamics of their interactions with the soil environment, host and disease establishment. Geostatistics provides tools that allow understanding and visualizing the spatial variability, to correlate and to associate it with the phenomena under study, contributing to the understanding of interactions between pathogen-host-environment. Therefore, the present experiment was to investigate and to implement geostatistics methods to understand the spatial distribution of fusarium wilt in black pepper. The experiment was conducted from 2010 to 2011 in the North of Espirito Santo State. Geostatistics was used to include the spatial dependence of the variables under study, for it was implemented a regular sampling grid (12.000m 2 ) and the disease incidence was evaluated over 150 days, a total of seven evaluations. In the last evaluation were carried out soil samples for chemical,, physical and textural analysis. The maps of disease distribution over time demonstrated an initial focus on the edges of the crop and theoretical models of the adjusted variogram represented the different stages of the epidemic of Fusarium in the black pepper crop.Key words: geostatistics; Fusarium solani f. sp. piperis; Piper nigrum L. IntroduçãoA análise espacial das doenças de plantas ao longo do tempo permite caracterizar o padr...

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“…Pathogen attacks result in the development of symptoms that include leaf and fruit wilt, stem and root rot (Rekah et al, 1999), coverage of leaf surface with pustule, chlorosis and necrosis (Fofana et al, 2007, Kocal et al, 2008 (Figure 2), a decreased rate of plant photosynthesis (Kocal et al, 2008), and as a consequence plant death or yield loss ensues (Berger et al, 2007). Fig.…”

Section: For the Plantmentioning

confidence: 99%