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Tuesday, August 4, 2020 | History

2 edition of biological study of Phoma exigua. found in the catalog.

biological study of Phoma exigua.

Andrew Robert Entwistle

biological study of Phoma exigua.

by Andrew Robert Entwistle

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Published .
Written in English


Edition Notes

Thesis (Ph. D.)--The Queens" University of Belfast, 1970.

The Physical Object
Pagination1 v
ID Numbers
Open LibraryOL19930056M

A histological study of the development of lesions caused by P. exigua var. exigua and P. exigua var. foveata was made in immature tubers of potato cv. Brownell at 18, 10 or 2°C and in mature tubers of cv. Brownell and Bismark at 10°. At 10 and 18°, lesion development was arrested in both cultivars and maturities. Evidence indicated that suberization and lignification are involved in the Cited by: Phoma exigua var. diversispora (Bubák) Boerema, Gewasbescherming () [MB#].

Ascochyta blight, caused by Phoma exigua var. diversispora (Bubak) Boerema, is a serious constraint in the cultivation of the common bean (Phaseolus vulgaris L.) in Rwanda, particularly in the cool and wet highland production areas. In order to identify resistant genotypes, a germplasm evaluation study was conducted to quantify the impact of the disease on phenotypic and agronomic traits under Author: Clement Urinzwenimana, Rob Melis, Julia Sibiya. Phoma is arbitrarily limited to those species in which the spores are less than 15 µm as the larger spored forms have been placed in the genus Macrophoma. The most important species include Phoma beta which is the cause of the heart rot and blight of beets, Phoma batata that produces a dry rot of sweet potato, and Phoma : Dothideomycetes.

Biology and recent developments in the systematics of Phoma, a complex genus of major quarantine significance. A study of some Phoma species. pH, and light on growth, sporulation, germination, and bioherbicidal efficacy of Phoma exigua, a potential biological control Author: M.M. Aveskamp, de J. Gruyter and P.W. Crous.   Phoma glomerata Basics Laboratory Metabolites Adverse health reactions Specific settings Diagnostic Bibliography Basics Phoma is the most widely distributed genus of the Pleosporales order (or Shaeropsidales when considered as part of the Fungi Imperfecti) and the largest with some species {; }. The taxonomy of this genus is complicated and the identification of.


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Biological study of Phoma exigua by Andrew Robert Entwistle Download PDF EPUB FB2

A biological study of Phoma exigua Author: Entwistle, Andrew Robert ISNI: Awarding Body: Queen's University Belfast Current Institution: Queen's University Belfast Date of Award: Availability of Full Text: Full text unavailable from EThOS.

Study of Phoma exigua Populations in the field†. Strip-baits, consisting of filter-paper disks sandwiched between plastic tapes, were exposed in potato crops in and The frequency of isolation of Phoma exigua by: 4.

The original genus concept of Saccardo was emended by Boerema and Bollen and after more than 40 years of taxonomical research, the biological study of Phoma exigua. book Phoma species were arranged in nine sections [6, 7], which are mainly based on a single or just a few morphological characters and have not been confirmed as biologically realistic by molecular biological studies [2, 8].Cited by: However, the Phoma name was introduced in by the Italian mycologist Pier Andrea Saccardo.

The Phoma genus initially contained only plant stem pathogens, but nowadays this group comprises opportunists, pathogens and saprobes. Phoma is an anamorphic genus, meaning its members reproduce. Phoma exigua (now Boeremia exigua, Aveskamp et al., ) from R.

repens in Turkey that is the subject of this study. The isolate of B. exigua (Desm.) Aveskamp, Gruyter & Verkley (FDWSRU isolate ) reported on in this study was collected in Turkey in (Tunali et al., ). This isolate is a facultative saprophyte. Tween. Paralelly inoculation of the same age pea plants by an isolate of Phoma pinodella (Jones) Morgan-Jones et Burch (GA – isolated in December from a seed of Pisumsativumvar.

arvensegrown at Obrazów) at the same conidial concentration as var. exigua isolates was performed. 12 to 15 plants of. Morphology and Molecular Biology of Phoma. Phoma Sacc. emend. Boerema and G.J. Bollen () is an ubiquitous genus, which has been reported from plants, soil, human beings, animals and air.

The speciation of the genus Phoma was based on host-alone and later on, the trend was to study different species of Phoma in pure culture. A survey was conducted in British Columbia, Canada during the summer of to identify fungal pathogens of salal (G.

shallon) that might serve as biological control agents. exigua isolate PCF was observed to be pathogenic on salal. Morphological and molecular studies verified the identity of the species and inoculation studies confirmed its by: 3. Phoma species are phytopathogens that are widely distributed in the environment, most commonly found in aquatic systems and spp.

have the potential to be pathogenic in plants, animals and humans; the latter is a rare occurrence. However, as our immunocompromised population increases, so do the reports of these infections. Medical advances have allowed for the increase in Cited by: Twelve isolates of eleven Phoma species were compared in this study.

The morphological identification of the isolates was done following the descriptions of Boerama et al. The obtained results indicated that the microscopical and cultural characteristics of the concerned Phoma isolates fit to the identity of Phoma species given in Table 1.

Phoma exigua Desm. (teleomorph Didymella exigua (Niessl) Sacc.) was isolated from wilted Centaurea solstitialis L. (yellow starthistle) plants displaying necrosis of the crown that were found near Krasnodar, Russia. The fungus was identified using morphological and cultural characteristics (1,2) and confirmed by sequencing the complete internal transcribed spacer region of the nuclear rDNA.

This isolate of Phoma exigua is a destructive pathogen on A. repens, and severe disease can be produced by inoculation of foliage with an aqueous suspension of conidia. These characteristics make this isolate of P.

exigua a potential candidate for biological control of. The cosmopolitan Phoma genus contains mainly phytopathogenic, opportunistic parasite, and saprophyte fungal species.

The currently applied classification is based on morphological characters. In this study, a preliminary classification for six taxa of Phoma were constructed, viz. exigua var. The potential of the different Phoma exigua var.

exigua strains for the biocontrol of the perennial weeds Sonchus arvensis and Cirsium arvense, occurring throughout temperate regions of the world, has been evaluated in previous studies.

The majority of the above strains produced ascosonchine, a newly discovered enol tautomer of 4- pyridylpyruvic acid, whereas strains C and S-9, though Cited by: exigua, and Phoma eupyrena are fungal pathogens of potato, causing gangrene or pit rot symptoms in tubers, and they are responsible for significant crop losses.

Various techniques are available to identify these pathogens in the by: 1. Long-term management of phoma stem canker on oilseed rape, caused by the species complex Leptosphaeria maculans/L. biglobosa, was chosen as a case study because of the economic importance of the disease and the substantial scientific knowledge available on the pathosystem (Aubertot et al., ).

Epidemics of phoma stem canker are initiated by infected stubbles that. Abstract. Fungi belonging to the genus Phoma form a phylogenetically heterogeneous group with a broad range of possible plant hosts.

Most of them do not interfere with cultivation of crops; others, especially Phoma lingam with its perfect form Leptosphaeria maculans, are the causative agent of devastating field losses in rapeseed ent disease management requires profound Author: Johannes Wöstemeyer.

In order to evaluate the potential use of Phoma exigua isolate PFC (PFC) as a biological control agent for salal (Gaultheria shallon), effect of cultural and environmental parameters on. of the P. ligulicola var. inoxydabilis from pyrethrum.

This study also aimed to confirm the species identity and determine the varietyof Phoma exigua from diseased pyrethrum plants. Assessment of morphological and cultural characteristics showed considerable variability among P.

ligulicola isolates from pyrethrum (n = ) and chrysanthemum (n =5). The objectives of this project were to characterise the biological, cultural and genetic variability, and investigate the reproductive nature of the P.

ligulicola var. inoxydabilis from pyrethrum. This study also aimed to confirm the species identity and determine the variety of Phoma exigua from diseased pyrethrum by: 5. Phoma exigua (syn. Ascochyta gossypii) is a fungal plant pathogen.

It causes wet weather blight in cotton and it can be treated with systemic copper. Varieties of Phoma exigua [ edit ]Family: Incertae sedis.The genus Boeremia was established by Aveskamp et al.

() to accommodate phoma-like species that are morphologically similar and phylogenetically closely related to Ph. exigua. Taxa in this genus are characterised by ostioles with a hyaline inner layer of cells, with species producing aseptate and septate conidia (Aveskamp et al. ).Phoma exigua is considered to be an assemblage of at least nine varieties that are mainly distinguished on the basis of host specificity and pathogenicity.

However, these varietieCited by: