Sensitivity of Rhizoctonia species to different fungicides

Kataria, H.R.; Hugelshofer, U.; Gisi, U.

doi:10.1111/j.1365-3059.1991.tb02368.x

Cited by 51 publications

(32 citation statements)

References 23 publications

(14 reference statements)

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“…Isolados pertencentes a dez grupos de anastomose de R. solani (AG1 a AG10), bem como pertencentes a Rhizoctonia spp. binucleadas, foram igualmente sensíveis a baixas concentrações de methyl-tolclophos, com valores de EC 90 inferiores a 3 ppm (Kataria et al, 1991a(Kataria et al, , 1991b. Todavia, para R. solani AG1, os autores observaram ampla variação nos valores de EC 90 a pencycuron (1 a 500 ppm), alto valor de EC 90 para benomyl (38 ppm) e baixo valor de EC 90 para iprodione (1,8 ppm).…”

Section: Fig 2 -Incidência Média De Estacas De Eucalipto (Eucalyptusunclassified

“…Segundo Kataria et al (1991a), o sucesso do controle químico de rizoctonioses inespecíficas, causadas por diferentes espécies, grupos de anastomose e biótipos de Rhizoctonia, spp. requer que os fungicidas recomendados sejam eficientes contra os diferentes isolados do fungo.…”

Section: Introductionunclassified

“…são sensíveis a vários grupos de fungicidas, dentre os quais incluem-se os hidrocarbonetos aromáticos (PCNB, chloroneb e o fosforado methyl-tolclophos), benzimidazóis (benomyl, carbendazim, tiofanato-metílico e thiabendazol), carboximidas (carboxin), dicarboximidas (iprodione, vinclozolin e diclozolin), triazóis e triciclazóis (triadimenol, propiconazole, cyproconazole), morfolinas (fenpropimorph) e fenil-uréia (pencycuron). Todavia, existe variação quanto à sensibilidade aos fungicidas, avalidada pela inibição do crescimento micelial in vitro, entre várias espécies de Rhizoctonia (Kataria et al, 1991a) e entre diferentes grupos de anastomose de R. solani (Kataria et al, 1991b …”

Section: Introductionunclassified

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Controle químico da queima de folhas e da mela de estacas de eucalipto, causadas por Rhizoctonia spp.

et al. 2003

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Visando ao controle químico da queima de folhas e mela de estacas de eucalipto (Eucalyptus spp.) em viveiros florestais, avaliou-se a eficiência de 12 fungicidas em inibir in vitro o crescimento micelial de um isolado epifítico de Rhizoctonia solani AG1-IB (RH-2). Sete fungicidas que inibiram totalmente o crescimento micelial do fungo, a concentrações inferiores a 100 ppm, foram pré-selecionados: methyl-tolclophos, benomyl, pencycuron, iprodione, thiabendazol, thiram e captan. Avaliou-se, ainda, a sensibilidade (EC50 = dose provável que inibe o crescimento micelial em 50%) aos fungicidas methyl-tolclophos, benomyl, iprodione e pencycuron de mais oito isolados patogênicos ao eucalipto, que diferem entre si quanto a virulência, morfologia, grupo de anastomose, número de núcleos por célula vegetativa e padrões eletroforéticos de proteínas e isoenzimas. Embora variações nos valores de EC50 entre algumas combinações de fungicidas e isolados tenham ocorrido, todos os isolados foram sensíveis aos quatro fungicidas testados (EC50 < 11 ppm). Sob condições controladas, pulverizações com iprodione (1,5 g/l), benomyl (1 g/l), methyl-tolclophos (1,5 g/l), thiram ( 2,1 g/l), captan (2 g/l) e pencycuron (2 g/l) reduziram significativamente (alfa=5%) a incidência de folhas lesionadas por R. solani AG1, em brotações de mudas envasadas. Associadas à poda de limpeza, pulverizações de brotações de eucalipto em jardim clonal (no campo) com iprodione (1 g/l) ou com mistura de benomyl (0,5 g/l) + captan (1 g/l), alternada com mistura de benomyl (0,5 g/l) + thiram (1 g/l), reduziram a incidência da mela de estacas na casa de vegetação (alfa=5%).

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Section: Fig 2 -Incidência Média De Estacas De Eucalipto (Eucalyptusunclassified

Section: Introductionunclassified

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Controle químico da queima de folhas e da mela de estacas de eucalipto, causadas por Rhizoctonia spp.

et al. 2003

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“…Rhizoctonia species and anastomosis groups (AGs) vary in sensitivity to commonly applied fungicides (Martin et al 1984a, b;Carling et al 1990; Kataria et al 1991;Kataria and Gisi 1996;Campion et al 2003). In addition, different Rhizoctonia species have different temperature ranges most conducive for causing disease.…”

Section: Introductionmentioning

confidence: 99%

DNA fingerprinting and anastomosis grouping reveal similar genetic diversity inRhizoctonia speciesinfecting turfgrasses in the transition zone of USA

Amaradasa

Horvath

Lakshman³

et al. 2013

Mycologia

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Rhizoctonia blight is a common and serious disease of many turfgrass species. The most widespread causal agent, Thanatephorus cucumeris (anamorph: R. solani), consists of several genetically different subpopulations. In addition, Waitea circinata varieties zeae, oryzae and circinata (anamorph: Rhizoctonia spp.) also can cause the disease. Accurate identification of the causal pathogen is important for effective management of the disease. It is challenging to distinguish the specific causal pathogen based on disease symptoms or macroscopic and microscopic morphology. Traditional methods such as anastomosis reactions with tester isolates are time consuming and sometimes difficult to interpret. In the present study universally primed PCR (UP-PCR) fingerprinting was used to assess genetic diversity of Rhizoctonia spp. infecting turfgrasses. Eighty-four Rhizoctonia isolates were sampled from diseased turfgrass leaves from seven distinct geographic areas in Virginia and Maryland. Rhizoctonia isolates were characterized by ribosomal DNA internal transcribed spacer (rDNA-ITS) region and UP-PCR. The isolates formed seven clusters based on ITS sequences analysis and unweighted pair group method with arithmetic mean (UPGMA) clustering of UP-PCR markers, which corresponded well with anastomosis groups (AGs) of the isolates. Isolates of R. solani AG 1-IB (n 5 18), AG 2-2IIIB (n 5 30) and AG 5 (n 5 1) clustered separately. Waitea circinata var. zeae (n 5 9) and var. circinata (n 5 4) grouped separately. A cluster of six isolates of Waitea (UWC) did not fall into any known Waitea variety. The binucleate Rhizoctonia-like fungi (BNR) (n 5 16) clustered into two groups. Rhizoctonia solani AG 2-2IIIB was the most dominant pathogen in this study, followed by AG 1-IB. There was no relationship between the geographic origin of the isolates and clustering of isolates based on the genetic associations. To our knowledge this is the first time UP-PCR was used to characterize Rhizoctonia, Waitea and Ceratobasidium isolates to their infraspecies level.

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“…It is common to isolate multiple Rhizoctonia species and AGs from infected turfgrasses. Different Rhizoctonia species and AGs vary in sensitivity to commonly applied fungicides [9][10][11][12] and they also have different temperature ranges conducive for causing disease [8]. Therefore, correct identification of the causal pathogen and its AG is important to predict the disease progression and make future disease management decisions.…”

Section: Introductionmentioning

confidence: 99%

AFLP Fingerprinting for Identification of Infra-Species Groups of Rhizoctonia solani and Waitea circinata

Amaradasa¹,

Amundsen²

2015

J Plant Pathol Microbiol

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Patch diseases caused by Thanatephorus cucumeris (Frank) Donk and Waitea circinata Warcup and Talbot varieties (anamorphs: Rhizoctonia species) pose a serious threat to successful maintenance of several important turfgrass species. Reliance on field symptoms to identify Rhizoctonia causal agents can be difficult and misleading. Different Rhizoctonia species and Anastomosis Groups (AGs) vary in sensitivity to commonly applied fungicides and they also have different temperature ranges conducive for causing disease. Thus correct identification of the causal pathogen is important to predict disease progression and make future disease management decisions. Grouping Rhizoctonia species by anastomosis reactions is difficult and time consuming. Identification of Rhizoctonia isolates by sequencing Internal Transcribed Spacer (ITS) region can be cost prohibitive. Some Rhizoctonia isolates are difficult to sequence due to polymorphism of the ITS region. Amplified Fragment Length Polymorphism (AFLP) is a reliable and cost effective fingerprinting method for investigating genetic diversity of many organisms. No detailed analyses have been done to determine the suitability of AFLP for inferring infra-species level of Rhizoctonia isolates. The objective of the present study was to develop AFLP fingerprinting to identify infra-species level of unknown R. solani Kühn and W. circinata isolates. Seventy-nine previously characterized R. solani (n=55) and W. circinata (n=24) isolates were analyzed with AFLP markers generated by four primer pairs. Unweighted Pair Group Method with Arithmetic Mean (UPGMA) correctly grouped R. solani and W.circinata isolates according to their AG, AG subgroup or W.circinata variety. Principle component analysis (PCA) corroborated UPGMA clusters. To our knowledge this is the first time AFLP analysis has been tested as a method to decipher the AG, AG subgroup or W.circinata variety across a wide range of Rhizoctonia isolates.

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Sensitivity of Rhizoctonia species to different fungicides

Cited by 51 publications

References 23 publications

Controle químico da queima de folhas e da mela de estacas de eucalipto, causadas por Rhizoctonia spp.

Controle químico da queima de folhas e da mela de estacas de eucalipto, causadas por Rhizoctonia spp.

DNA fingerprinting and anastomosis grouping reveal similar genetic diversity inRhizoctonia speciesinfecting turfgrasses in the transition zone of USA

AFLP Fingerprinting for Identification of Infra-Species Groups of Rhizoctonia solani and Waitea circinata

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