Phytogard® (K2HPO3) induces localized resistance in cauliflower to downy mildew of crucifers

Bécot, Stéphanie; Pajot, Emmanuel; Corre, Daniel Le; Monot, C.; Silué, D.

doi:10.1016/s0261-2194(00)00034-x

Cited by 48 publications

(34 citation statements)

References 27 publications

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“…The results obtained with FP corroborate those reported by Yáñez et al (2012), which succeeded in applying FP foliar control powdery mildew in cucumber levels above 40%. Similar results were reported by Bécot et al (2000) to Peronospora parasitica in cauliflower; Monsalve et al (2012) to Peronospora destructor in onions and Pinto et al (2012) to Plasmopara viticola on vine.…”

Section: Resultados Y Discusiónsupporting

confidence: 81%

“…Los resultados obtenidos con FP, corroboran lo reportado por Yáñez et al (2012), que al aplicar FP foliarmente lograron controlar a la cenicilla en pepino en niveles superiores a 40%. Resultados similares fueron reportados por Bécot et al (2000), para Peronospora parasítica en coliflor; Monsalve et al (2012), para Peronospora destructor en cebolla y Pinto et al (2012), para Plasmopara viticola en vid. mildew severity than 50%; in all samples, the severity of powdery mildew in the control was statistically superior to the average values obtained by effect of salts, except with SP at 35 ddpa ( Figure 1C).…”

Section: Resultados Y Discusiónunclassified

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Sales minerales para el control de la cenicilla (Oidium sp.) en pepino

Juárez

Ruvalcaba

Zavaleta-Mejía

et al. 2017

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ResumenSe evaluó el impacto de sales minerales fosfito de potasio (6 mL L -1 ), fosfito de calcio (10 g L -1 ), sulfato de potasio (17 g L -1 ) y nitrato de calcio (20 g L -1 ) en la cenicilla ocasionada por Oidium sp. en el cultivo de pepino. El experimento se estableció en condiciones de invernadero bajo diseño de bloques completos al azar con seis repeticiones por tratamiento. Por siembra directa, las plantas de pepino (Cucumis sativus L.) cv 'Zapata' se hicieron crecer en bolsas de plástico con capacidad de 4.5 kg y sustrato de coco (70% fibra gruesa y 30% fibra fina); cuando las plantas (dos por maceta) tuvieron cinco hojas verdaderas, se aplicaron al follaje soluciones de los tratamientos con un atomizador manual, en cinco ocasiones con intervalos de 7 días. La infección por cenicilla en las plantas se desarrolló de manera natural. Se evaluó la altura de planta, número de hojas, área foliar, verdor foliar, número de hojas enfermas e incidencia y severidad de cenicilla. No hubo diferencia significativa (p≤ 0.05) en las variables altura, área foliar, verdor y número de hojas en las plantas evaluadas. La mayor protección contra cenicilla (Oidium sp.) se obtuvo con las aplicaciones de nitrato de calcio y fosfito de potasio, superando aquella proporcionada por fosfito de calcio y sulfato de potasio. El AbstractThe impact of mineral salts potassium phosphite (6 mL L -1 ) phosphite calcium (10 g L -1 ), potassium sulfate (17 g L -1 ) and calcium nitrate (20 g L -1 ) was assessed on powdery mildew caused by Oidium sp. in cucumber cultivation. The experiment was established in greenhouse conditions under design randomized complete block with six replicates per treatment. The direct sowing, cucumber plants (Cucumis sativus L.) cv 'Zapata' were grown in plastic bags with a capacity of 4.5 kg and coconut substrate (70% coarse fiber and 30% fine fiber); when plants (two per pot) had five true leaves, they were applied to foliage treatment solutions with a manual atomizer, five times at intervals of 7 days. The powdery mildew infection in plants evolved naturally. The plant height, leaf number, leaf area, leaf greenness, number of diseased leaves and incidence and severity of powdery mildew was evaluated. There was no significant difference (p≤ 0.05) in the variables height, leaf area, greenery and number of leaves in plants evaluated. The greatest protection against powdery mildew (Oidium sp.) was obtained with the application of calcium nitrate and potassium phosphite, phosphite surpassing that provided by calcium and potassium sulfate. Calcium nitrate and 1552 Rev. Mex. Cienc. Agríc. Vol.7 Núm. 7 28 de septiembre -11 de noviembre, 2016Moisés Gilberto Yáñez Juárez et al.nitrato de calcio y fosfito de potasio en dosis de 20 g y 6 mL L -1 de agua, respectivamente, constituyen una alternativa para el manejo de la cenicilla en pepino.Palabras clave: Cucumis sativus, fosfito de potasio, nitrato de calcio. IntroducciónEn México, la cenicilla de las cucurbitáceas es una enfermedad foliar común en plantas cultivadas y silvest...

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Section: Resultados Y Discusiónsupporting

confidence: 81%

Section: Resultados Y Discusiónunclassified

Sales minerales para el control de la cenicilla (Oidium sp.) en pepino

Juárez

Ruvalcaba

Zavaleta-Mejía

et al. 2017

Remexca

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“…Assim, o tempo de exposição da planta ao etileno estimulará ou reduzirá a resistência da planta a um determinado patógeno (Van Loon et al, 2006 (Hoffman et al, 1999). Plantas de couve-flor apresentaram redução na severidade do míldio, causado por Peronospora parasitica, quando pulverizadas com sais de fosfito, na concentração de 7 ml/L (Bécot et al, 2000). A ineficiência do Acibenzolar-S-Metil em reduzir o CRL apenas para a cultivar Labelle pode estar relacionada com a dose utilizada, ou, até mesmo, com o tempo necessário para que as plantas dos cultivares testados pudessem ativar a resistência sistêmica adquirida.…”

Section: Resultsunclassified

Eficiência de diferentes moléculas na redução dos sintomas da queima das bainhas em arroz e no crescimento de Rhizoctonia solani in vitro

et al. 2013

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Efficiency of different molecules on the reduction of sheath blight symptoms in rice and on Rhizoctonia solani growth in vitroThis study aimed to test the efficiency of different molecules on the reduction of the relative lesion extension (RLE) of sheath blight in rice. Plants of cultivars BR-Irga 409 and Labelle were grown in nutrient solution and inoculated with Rhizoctonia solani at the maximum tillering stage. At 24 hours before inoculation, sheaths of plants were sprayed with solutions of potassium silicate (PS), potassium silicate + phosphorus (PS+P), Acibenzolar-S-Methyl (ASM), Carbendazim fungicide, deacetylated chitosan (DC), ethylene (ET) and potassium phosphite (PP). Sheaths from plants sprayed with water served as the control treatment. The effect of these products on R. solani mycelia growth was also studied in vitro. For BR-Irga 409, the RLE was lower with the application of PP compared with the other treatments, except the Carbendazim. The application of Carbendazim reduced in 86.1% the RLE in comparison with the control. The RLE was lower for BR-Irga 409 than for Labell with the application of PP. Mycelia growth of R. solani was inhibited only by PP and Carbendazim in comparison with the other treatments. There was no significant difference among the treatments control, PS, and PS+P for silicon concentration on sheaths of plants of the two cultivars. Este estudo verificou a eficiência da aplicação de diferentes moléculas em reduzir o comprimento relativo da lesão (CRL) da queima das bainhas em arroz. Plantas dos cultivares BR-Irga 409 e Labelle foram cultivadas em solução nutritiva e inoculadas com Rhizoctonia solani, no estádio de máximo perfilhamento. Às 24 horas antes da inoculação, as bainhas das plantas foram pulverizadas com soluções de silicato de potássio (SP), silicato de potássio + fósforo (SP+F), Acibenzolar-S-Metil (ASM), fungicida Carbendazim, quitosana desacetilada (QD), etileno (ET) e fosfito de potássio (FP). Plantas cujas bainhas foram pulverizadas com água destilada serviram como testemunhas. O efeito das moléculas contidas nesses produtos no crescimento micelial de R. solani foi testado in vitro. Para BR-Irga 409, o CRL foi menor com a aplicação do FP, em relação aos demais tratamentos, exceto o Carbendazim. A aplicação do Carbendazim reduziu em 86,1% o CRL, em relação à testemunha. O CRL foi significativamente menor no cultivar BR-Irga 409 do que no 'Labelle', com aplicação do FP. O crescimento micelial de R. solani foi reduzido apenas pelo FP e Carbendazim, em comparação com os demais tratamentos. Não houve diferença significativa entre os tratamentos testemunha, SP e SP+F para a concentração de Si nas bainhas das plantas dos dois cultivares.Palavras-chave: indução de resistência, indutores, Oryza sativa, Rhizoctonia solani, silicatos.

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“…Phosphites, in general, are environmentally harmless compounds (GUEST and GRANT 1991) that can stimulate plant defence responses and also reduce disease severity in different plants (PANICKER and GANGADHARAN 1999;BÉCOT et al 2000;REUVENI et al 2003;JOHNSON et al 2004;LOBATO et al 2008a), representing a potential alternative to be used in an integrated crop management programme.…”

Section: Discussionmentioning

confidence: 99%

Antimicrobial activity of phosphites against different potato pathogens

et al. 2010

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Phosphites have low-toxicity on the environment and show high efficacy in controlling oomycete diseases in plants, both by a direct and an indirect mechanism. We have shown that they are also effective in reducing disease symptoms produced by Phytophthora infestans, Fusarium solani and Rhizoctonia solani when applied to potato seed tubers. To gain better insight into the direct mode of action of phosphites on different potato pathogens, and to ascertain chemical determinants in their direct antimicrobial activity, four potato pathogens were assayed with respect to sensitivity toward calcium, potassium and copper phosphites (CaPhi, KPhi and CuPhi, respectively). The influence of acidification and ionic strength changes after Phi addition on the antimicrobial activity, and the fungicidal or fungistatic activity, were evaluated. Results showed that phosphites were able to inhibit growth of all pathogens. Phytophthora infestans was the most inhibited pathogen by all phosphites, followed by Streptomyces scabies, while Rhizoctonia solani and Fusarium solani were less inhibited. CuPhi had the highest antimicrobial activity against the four pathogens analysed, and CaPhi and KPhi showed similar antimicrobial activities. Inhibitions by CuPhi and CaPhi could be partially explained by acidification of the media. However, results obtained with KPhi demonstrated that the phosphite anion has antimicrobial activity itself. The increase in ionic strength after Phi addition was not important in the antimicrobial activity of Phi. The activity of phosphites on germination of F. solani spores showed to be fungistatic rather than fungicidal.

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Phytogard® (K2HPO3) induces localized resistance in cauliflower to downy mildew of crucifers

Cited by 48 publications

References 27 publications

Sales minerales para el control de la cenicilla (Oidium sp.) en pepino

Sales minerales para el control de la cenicilla (Oidium sp.) en pepino

Eficiência de diferentes moléculas na redução dos sintomas da queima das bainhas em arroz e no crescimento de Rhizoctonia solani in vitro

Antimicrobial activity of phosphites against different potato pathogens

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