Long-lasting changes in the species spectrum of cucurbit powdery mildew in the Czech Republic - influence of air temperature changes or random effect?

Lebeda, A.; Sedláková, B.; Křístková, E.; Vysoudil, Miroslav

doi:10.17221/2807-pps

Cited by 23 publications

(31 citation statements)

References 13 publications

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“…Similar results of species spectra and pathogenic variability were recently reported for cucurbit powdery mildew (Křístková et al. 2009; Lebeda et al. 2009).…”

Section: Discussionsupporting

confidence: 89%

Distribution, Host Range and Disease Severity of Pseudoperonospora cubensis on Cucurbits in the Czech Republic

Lebeda¹,

Pavelková²,

Urban³

et al. 2011

Journal of Phytopathology

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Ales leš Lebeda ebeda, Jana ana Pavelkova avelková , Jirı iř í Urban rban and Bozena ožena Sedlakova edlá ková Abstract Cucurbit downy mildew, caused by Pseudoperonospora cubensis, is a major cucumber disease in the Czech Republic. Disease prevalence, host range and disease severity were evaluated from 2001 to 2009. The geographical distribution of P. cubensis was assessed on ca 80-100 locations per year in two main regions of the Czech Republic (central and southern Moravia, and eastern, northern and central Bohemia). Infection by P. cubensis was observed primarily on cucumber (Cucumis sativus) but only on the leaves. During the study, disease prevalence ranged from 66 to 100%. The majority of C. sativus crops were heavily infected at the end of the growing season (second half of August). Generally, P. cubensis was present at high or very high disease severity. The loss of foliage results in the reduction in the quality and quantity of marketable yield of fruit. Pseudoperonospora cubensis was widespread across the whole area of the Czech Republic studied. Very rarely, infection was recorded in muskmelon (Cucumis melo) and Cucurbita moschata. Of other pathogens, the most frequently recorded was the cucurbit powdery mildew (Golovinomyces cichoracearum and Podosphaera xanthii).

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“…Similar results of species spectra and pathogenic variability were recently reported for cucurbit powdery mildew (Křístková et al. 2009; Lebeda et al. 2009).…”

Section: Discussionsupporting

confidence: 89%

Distribution, Host Range and Disease Severity of Pseudoperonospora cubensis on Cucurbits in the Czech Republic

Lebeda¹,

Pavelková²,

Urban³

et al. 2011

Journal of Phytopathology

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“…This has already been hypothesized for Czech G. orontii populations by Lebeda et al . () and for the north of Italy by Pirondi et al . (), and also affects population genetics of cucurbit downy mildew, Pseudoperonospora cubensis (Lebeda & Cohen, ; Kitner et al ., ).…”

Section: Discussionmentioning

confidence: 90%

“…Golovinomyces orontii is a heterothallic species, forming chasmothecia bearing 10–14 asci with two to three ascospores (Lebeda, ). However, chasmothecia are very rarely formed (Braun & Cook, ) and they have only been observed in the Czech Republic, where G. orontii is the dominant powdery mildew species (Lebeda, ; Křístková et al ., ; Lebeda et al ., ), and sporadically in Germany, Hungary and Bulgaria (Křístková et al ., ) but never recorded in Italy (Pirondi et al ., ). In Italy, G. orontii is responsible for the early powdery mildew infections on cucurbit cultivation in late spring and it remains the dominant species until the end of spring/mid‐summer.…”

Section: Introductionmentioning

confidence: 99%

Genetic structure and phylogeny of Italian and Czech populations of the cucurbit powdery mildew fungus Golovinomyces orontii inferred by multilocus sequence typing

et al. 2015

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Cucurbit powdery mildew caused by Golovinomyces orontii is a serious disease that affects cucurbit crops in temperate areas. In northern Italy, the species is responsible for the early infections at the beginning of the growing season. However, chasmothecia have never been recorded in Italy and the impact of either asexual or sexual reproduction of G. orontii remains to be determined. To investigate and compare the genetic structure of Italian populations with those from the Czech Republic, where chasmothecia are sporadically recorded, seven housekeeping gene fragments (tef-1a, csI, ITS, H3, tub2, IGS and mtLSU) were amplified and used in a multilocus sequence typing (MLST) approach. The four-gamete test was performed to detect recombination between and within populations. Phylogeny was inferred using both Bayesian and minimum evolution analyses. Results from MLST revealed the presence of 141 single nucleotide polymorphisms and the existence of 13 different haplotypes. Phylogenetic analysis revealed the existence of two main distinct phylogenetic groups that were also highly genetically different, confirming that G. orontii is a species complex. Recombination was detected within both the phylogenetic groups and the geographical populations, indicating that sexual reproduction could have occurred. However, considering the lower haplotype diversity and the high frequency of ST3 (17 isolates) and ST7 (eight isolates) haplotypes, the Italian population could be predominantly clonal, while sexual reproduction may occasionally occur due to the introduction of genotypes similar to those from the Czech Republic.

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“…Each year, at least 100 locations were visited mostly in the main production areas, but also in areas with non-optimal climatic conditions for growing cucurbits (e.g. hilly areas) , Lebeda et al, 2007a, 2009a. The timing of visits was focused on the main harvest period (August & first half of September).…”

Section: Field Approachmentioning

confidence: 99%

Fungicide Resistance in Cucurbit Powdery Mildew Fungi

Lebeda¹,

MgGrath²,

Sedláková³

2010

Fungicides

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Long-lasting changes in the species spectrum of cucurbit powdery mildew in the Czech Republic - influence of air temperature changes or random effect?

Cited by 23 publications

References 13 publications

Distribution, Host Range and Disease Severity of Pseudoperonospora cubensis on Cucurbits in the Czech Republic

Distribution, Host Range and Disease Severity of Pseudoperonospora cubensis on Cucurbits in the Czech Republic

Genetic structure and phylogeny of Italian and Czech populations of the cucurbit powdery mildew fungus Golovinomyces orontii inferred by multilocus sequence typing

Fungicide Resistance in Cucurbit Powdery Mildew Fungi

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