Sensitivity to fungicides in the isolates of Phytophthora infestans (Mont.) de Bary in the Czech Republic from 2003 to 2008

Mazáková, J.; Zouhar, Miloslav; Ryšánek, P.; Táborský, V.; Hausvater, E.; Doležal, Petr

doi:10.17221/16/2010-pps

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…It is clear from this study that isolates sensitive to metalaxyl prevailed in the population, as also observed in Moscow and other Russian populations of P. infestans [ 21 ]. These findings corroborate results from other studies from Estonia [ 27 ], Latvia [ 25 ], Poland [ 62 , 97 ], Lithuania [ 93 ], the Czech Republic [ 98 ], and Nordic countries [ 96 ]. However, the predominance of metalaxyl-resistant strains has been reported in several European populations, such as the Republic of Ireland, Northern Ireland, France, and Cyprus [ 74 , 99 , 100 , 101 ], which is mainly due to the spread of the mefenoxam-insensitive genotype EU_13_A2.…”

Section: Discussionsupporting

confidence: 91%

Highly Diverse Phytophthora infestans Populations Infecting Potato Crops in Pskov Region, North-West Russia

Runno-Paurson

Agho

Zoteyeva

et al. 2022

JoF

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There is limited understanding of the genetic variability in Phytophthora infestans in the major potato cultivation region of north-western Russia, where potato is grown primarily by small households with limited chemical treatment of late blight. In this study, the mating type, sensitivity to metalaxyl, and genotype and population genetic diversity (based on 12 simple sequence repeat (SSR) markers) of 238 isolates of P. infestans from the Pskov region during the years 2010−2013 were characterized. The aim was to examine the population structure, phenotypic and genotypic diversity, and the prevalent reproductive mode of P. infestans, as well as the influence of the location, time, and agricultural management practices on the pathogen population. The frequency of the A2 mating was stable over the four seasons and ranged from 33 to 48% of the sampled population. Both mating types occurred simultaneously in 90% of studied fields, suggesting the presence of sexual reproduction and oospore production in P. infestans in the Pskov region. Metalaxyl-sensitive isolates prevailed in all four years (72%), however, significantly fewer sensitive isolates were found in samples from large-scale conventional fields. A total of 50 alleles were detected in the 141 P. infestans isolates analyzed for genetic diversity. Amongst the 83 SSR multilocus genotypes (MLGs) detected, 65% were unique and the number of MLGs varied between locations from 3 to 20. These results, together with the high genotypic diversity observed in all the locations and the lack of significance of linkage disequilibrium, suggest that sexual recombination is likely responsible for the unique MLGs and the high genetic diversity found in the Pskov region population, resembling those of north-eastern European populations.

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Section: Discussionsupporting

confidence: 91%

Highly Diverse Phytophthora infestans Populations Infecting Potato Crops in Pskov Region, North-West Russia

Runno-Paurson

Agho

Zoteyeva

et al. 2022

JoF

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“…The majority (72%) of isolates in this study were sensitive to metalaxyl. In the Czech Republic the majority of P. infestans isolates are sensitive to metalaxyl (95% of isolates collected in 2003–2008;Mazáková et al ., ). In Estonia 78·8% of isolates were sensitive to metalaxyl in 2007, although in 2005 only 15·2% were sensitive (Runno‐Paurson et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Diversity of Phytophthora infestans from Poland

et al. 2013

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A collection of 96 Polish isolates of Phytophthora infestans sampled in the years 2006, 2008 and 2009 were analysed using phenotypic and genotypic markers. Mating type, virulence, resistance to metalaxyl, mitochondrial haplotype and polymorphism at 12 simple sequence repeat (SSR) loci were determined. The majority of isolates were of the A1 mating type, mitochondrial haplotype Ia and sensitive to metalaxyl. Virulence factors against potato R genes R1, R3, R4, R7, R10 and R11 were present in most isolates. Genotyping using SSR markers revealed high genetic diversity within the Polish P. infestans population. Amongst the 96 isolates 66 unique genotypes were identified, 49 of which were observed only in single isolates. Eight isolates of the genotype 13_A2 lineage that has been reported in other parts of Europe were also found in Poland. The implications of these results are discussed.

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“…and other species of oomycetes [37]. Among these, metalaxyl, a phenylamide compound acts by inhibiting RNA polymerisation within the synthesis of ribosomal RNA and results in the inhibition of mycelial growth, haustorium formation and sporulation [38].…”

Section: Discussionmentioning

confidence: 99%

Improvement in the Management of Leaf Blight Disease of Taro (Colocasia esculenta) with Copper and Metalaxyl Fungicides

Omane

Oduro

Cornelius

et al. 2020

JEAI

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Taro (Colocasia esculenta (L.) Schott) is an important staple food crop for millions of people in developing countries. Taro production is constrained by many diseases of which leaf blight, caused by Phytophthora colocasiae Raciborski, is the most destructive and it accounts for up to 80% yield loss of taro in many countries. In Ghana, the disease accounts for 25 – 50% yield loss. Non-sustainability of cultural control method and the use of resistant varieties have compelled some farmers to abandon their fields while others have converted their farms to dry season vegetable farming. In this study, copper and metalaxyl fungicides were tested for the control of leaf blight disease of taro. In vitro fungicidal activity tests and field evaluation showed that Ridomil Gold Plus 66 WP (6% metalaxyl-M + 60% copper (I) oxide) and Metalm 72 WP (12% metalaxyl + 60% copper (I) oxide) at 50 g in 15 litres of water (3.3g/L) and Nordox 75 WG (86% cuprous oxide) at 75 g in 15 litres of water (5 g/L) are effective for the control of leaf blight disease of taro at 4 weekly intervals for five consecutive months in the wet season.

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Sensitivity to fungicides in the isolates of Phytophthora infestans (Mont.) de Bary in the Czech Republic from 2003 to 2008

Cited by 11 publications

References 27 publications

Highly Diverse Phytophthora infestans Populations Infecting Potato Crops in Pskov Region, North-West Russia

Highly Diverse Phytophthora infestans Populations Infecting Potato Crops in Pskov Region, North-West Russia

Diversity of Phytophthora infestans from Poland

Improvement in the Management of Leaf Blight Disease of Taro (Colocasia esculenta) with Copper and Metalaxyl Fungicides

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