Isolates of <i>Phytophthora cryptogea</i> Pathogenic to Wheat and Some Other Crop Plants

Larsson, Mariann; Gerhardson, B.

doi:10.1111/j.1439-0434.1990.tb04307.x

Cited by 20 publications

(9 citation statements)

References 16 publications

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“…In contrast, on kiwifruit vines. Larsson and Gerhardson (20) tested an isolate of P. cryptogea obtained from spinach on spinach, sugarbeet, wheat, cucumber, oat, pea, and rape. The days to disease development for most of our isolates of P. cryptogea on annual stock and gerbera daisy compared very closely to Tompkins and Tucker (34), Most annual stock plants wilted in approximately 18 to 24 days, whereas gerbera daisy plants developed disease more slowly, with symptoms appearing in 30 to 40 days.…”

Section: Fuchsiamentioning

confidence: 99%

Host Specificity and Variations in Aggressiveness of North Carolina Isolates of Phytophthora cryptogea and P. drechsleri in Greenhouse Ornamental Plants

Olson

Benson

2013

Plant Disease

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Olson, H, A,, and Benson, D, M, 2013, Host specificity and variations in aggressiveness of North Carolina isolates of Phytophthora cryptogea and P. drechsieri in greenhouse ornamental plants. Plant Dis, 97:74-80.Three isolates of Phytophthora cryptogea and three isolates of P. drechsieri were evaluated for host specificity and variations in aggressiveness on eight floriculture crops commonly grown in North Carolina, Plants were monitored for the development of foliar symptoms stemming from root rot caused by Phytophthora. No isolates of P. cryptogea or P. drechsieri had the same host range, though all P. cryptogea isolates caused foliar symptoms on gerbera daisy and annual stock, and all P. drechsieri isolates incited disease on osteospermum. No African marigold plants developed foliar symptoms of Phytophthora root rot. All P. cryptogea isolates caused foliar symptoms on at least three tested plant species. Isolates of P. drechsieri varied from highly specific and only causing disease on a single host species to relatively nonspecific and causing foliar symptoms on the majority of host plants. This is the first report of host specificity of ornamental isolates of P. drechsieri, and several of the tested plants are not reported hosts of P. drechsieri. Differences in isolate aggressiveness were found and depended on plant species; overall, isolates of P. drechsieri were more aggressive than P. cryptogea isolates. Isolations from nonsymptomatic inoculated plants suggest that these Phytophthora spp, could be moved between growers or from growers to consumers on nonsymptomatic infected ornamentals.

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Section: Fuchsiamentioning

confidence: 99%

Host Specificity and Variations in Aggressiveness of North Carolina Isolates of Phytophthora cryptogea and P. drechsleri in Greenhouse Ornamental Plants

Olson

Benson

2013

Plant Disease

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“…Similar oospores were also observed in rotted faba bean (Vicia faba L.) roots from field trials carried out at Findus AB involving both faba bean and pea, leading to the hypothesis that the same pathogen was able to infect these two hosts. The pathogen causing these symptoms was difficult to isolate but one relatively slow-growing Phytophthora isolate (isolate 97603 in this study) was retrieved from symptomatic pea roots in 1997 using a Phytophthora-selective medium described by Larsson and Gerhardson (16). This isolate was identified by Centraalbureau voor Schimmelcultures (CBS) as Phytophthora erythroseptica var.…”

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Root Rot of Pea and Faba Bean in Southern Sweden Caused by Phytophthora pisi sp. nov.

et al. 2013

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Heyman, F., Blair, J. E., Persson, L., and Wikström, M. 2013. Root rot of pea and faba bean in southern Sweden caused by Phytophthora pisi sp nov. Plant Dis. 97:461-471..'.>/' F i>-A root rot disease of pea and faba bean caused by a Phytophthora sp. was observed in fields and field soil samples in southern Sweden.Observations of the disease in pea root rot greenhouse assays were systematically recorded, and incidence and geographic distribution data were compared with the pea root rot caused by Aphanomyces euteiches. Following one successful isolation of the pathogen, isolation procedures and selective media were optimized to retrieve more isolates. Phylogenetic analysis showed that the isolates belong to a novel lineage, closely related to Phytopitthora sojae, and proposed here as a new species, P. pisi sp. nov. In a collection of 13 isolates from separate fields, intraspecific variation was detected in both nuclear and mitochondrial loci. Pathogenicity tests on a range of crop plants and wild legumes suggest that the host range of the pathogen is restricted to a group of legumes closely related to pea which, in addition to pea, include the crop species faba bean, lentil, common vetch, and chickpea. Morphology, growth requirements, and pathogenicity traits indicate that the species may be identical to the organism previously described as P. erythroseptica var. pisi. The work characterizes a novel Phytophthora sp. causing root rot of legume crops.

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“…to be pathogenic towards members of the grass family (e.g. Larsson and Gerhardson, 1990) a potential role as a root/leaf pathogen of reed cannot be ruled out and requires further investigation.…”

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Widespread Detection of Phytophthora Taxon Salixsoil in the Littoral Zone of Lake Constance, Germany

Nechwatal¹,

Mendgen²

2006

Eur J Plant Pathol

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An unnamed ITS clade 6 Phytophthora was frequently isolated from rhizosphere soil of reed (Phragmites australis) growing on the littoral zone of Lake Constance. The isolates closely resembled P. gonapodyides, having internally proliferating, non-papillate sporangia, a rather high temperature optimum for growth (30°C), and being sexually sterile. ITS sequence analysis revealed that they were identical to the as yet unnamed Phytophthora taxon Salixsoil, originally isolated from Salix roots in the UK and Alnus debris in Denmark. The taxon was readily isolated from permanently as well as occasionally flooded reed sites using standard baiting procedures, indicating a wide distribution in the Lake Constance littoral zone. In an in vitro leaf inoculation assay P. taxon Salixsoil proved to be more aggressive towards Salix alba than P. gonapodyides. The new taxon may be of significance as a root pathogen of woody plants in moist or flooded situations occurring in alluvial forest/plant communities. We propose that due to its close resemblance to P. gonapodyides the taxon might have passed unnoticed in the past, and possibly is much more widely distributed than previously recognised.

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Isolates of Phytophthora cryptogea Pathogenic to Wheat and Some Other Crop Plants

Cited by 20 publications

References 16 publications

Host Specificity and Variations in Aggressiveness of North Carolina Isolates of Phytophthora cryptogea and P. drechsleri in Greenhouse Ornamental Plants

Host Specificity and Variations in Aggressiveness of North Carolina Isolates of Phytophthora cryptogea and P. drechsleri in Greenhouse Ornamental Plants

Root Rot of Pea and Faba Bean in Southern Sweden Caused by Phytophthora pisi sp. nov.

Widespread Detection of Phytophthora Taxon Salixsoil in the Littoral Zone of Lake Constance, Germany

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