Efficacy of Pencycuron Against Isolates Representing Different Anastomosis Groups of Rhizoctonia solani and Rhizoctonia-like Binucleate Fungi

Summer, D. R.

doi:10.1094/pd-71-0515

Cited by 14 publications

(7 citation statements)

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“…A sensibilidade de R. solani e Rhizoctonia spp. à pencycuron é altamente variável, mesmo entre isolados de mesmo grupo de anastomose (Roberts & Stephens, 1984;Sumner, 1987). Segundo Ueyama et al (1993), pencycuron é a única molécula ativa do fungicida na célula.…”

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

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

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

et al. 2003

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“…Pencycuron is a novel fungicide with selective activity only against R. solani (YAMADA 1986) and has been reported to control R. solani infections in rice (AGl; YAMADA 1986), potatoes (AG3; LnTLE and COOKE 1988), cotton (AG4; HILLOCKS et al 1988), beans (AG2-1, AG2-2, AG4; GULLINO et al 1984;SUMMER 1987), sugarbeet (AG2;SCHNEIDER and POTTER 1983;RUPPEL and HECKER 1987), cowpea (AG4;SuMNER et al 1988;KATARIA et al 1989) and St. Augustine grass (AG2-1; GRISHAM 1985). In the present study, pencycuron expressed strong activity only against AG2-2, AG3, AG6 and AG9 and was ineffective towards the six other AGs and all 20 AG4 isolates infecting rapeseed/canola in Saskatchewan and Alberta.…”

Section: Discussionmentioning

confidence: 99%

Variability in the Sensitivity of Rhizoctonia solani Anastomosis Groups to Fungicides

Kataria¹,

Verma²,

Gisi³

1991

Journal of Phytopathology

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Tolclofos-methyl, iprodione and cyproconazole, among the eleven fungicides tested in vitro, gave consistently strong inhibition against all ten anastomosis groups (AGs) of Rhizoctonia solani. Carboxin, furmecyclox, thiabendazole, fenpropimorph and vinclozolin also inhibited all AGs but with wide variations in toxicity levels (EC90 values). Pencycuron showed strong activity against four AGs but was ineffective against the other six AGs. Generally, R. solani AGs were insensitive to fenarimol and imazalil. Tolclofos-methyl strongly inhibited 23 AG2-1 and 20 AG4 rapeseed/canola R. solani isolates from different locations in Saskatchewan, Alberta and Manitoba. The same isolates were also sensitive to iprodione, cyproconazole and carboxin. All AG4 canola isolates were insensitive to pencycuron (EC90 > 500 mg/1) while AG2-1 isolates showed highly variable levels of sensitivity with EC90s ranging from 0.5 to 220 mg/1. Tolclofos-methyl, applied to Brassica napus (canola) cv. Westar seed at 1 g a.i./kg, provided 75-100 % control of seedling damping-off in pots infested with AG2-1 or AG4 isolates. In parallel experiments, pencycuron (1 g a.i./kg seed) failed to control damping-off by AG4 canola isolates and gave variable disease control against AG2-1 isolates.

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“…azoxystrobin, benomyl, carbendazim, fluazinam, fludioxonil, imazalil, iprodione, mepronil, pencycuron, propiconazole, quintozene (PCNB), thiabendazole, thiram and tolclofos-methyl (Davis et al, 1971;Chand & Logan, 1982;Leach & Murdoch, 1985;Sumner, 1987;Jager et al, 1991;Olaya et al, 1994;Wicks et al, 1995;Virgen-Calleros et al, 2000), but mostly provided varying and inconsistent control. R. solani has acquired resistance to both protectant organic fungicides such as captan, dichlone, maneb, quintozene, thiram and tolclofos-methyl (Shatla & Sinclair, 1963;Elsaid & Sinclair, 1964;Meyer & Parmeter, 1968;Van Bruggen & Arneson, 1984) and to systemic fungicides such as benomyl, carboxin, dichlozoline, oxycarboxin, thiophanate-methyl and 2-(thiocyanomathylthio)-benzothiazole (TCMTB) (Martin et al, 1984).…”

Section: Chemical Controlmentioning

confidence: 99%

A Comprehensive Overview on Black Scurf of Potato

Kumar¹,

Singh²,

Kumar³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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Efficacy of Pencycuron Against Isolates Representing Different Anastomosis Groups of Rhizoctonia solani and Rhizoctonia-like Binucleate Fungi

Cited by 14 publications

References 0 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.

Variability in the Sensitivity of Rhizoctonia solani Anastomosis Groups to Fungicides

A Comprehensive Overview on Black Scurf of Potato

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