scholarly journals Characterization and Survival of Rhizoctonia solani AG2-2 LP Associated with Large Patch Disease of Zoysia Grass

Plant Disease ◽  
1998 ◽  
Vol 82 (8) ◽  
pp. 857-863 ◽  
Author(s):  
T. Aoyagi ◽  
K. Kageyama ◽  
M. Hyakumachi
Keyword(s):  
Rhizoctonia Solani ◽  
Early Spring ◽  
Optimum Temperature ◽  
Cultural Characteristics ◽  
Large Patch ◽  
Disease Occurrence ◽  
History Of ◽  
Healthy Area ◽  
Patch Disease ◽  
Irregular Cluster

Prevalence and sites of survival of Rhizoctonia solani AG2-2 LP were studied in zoysia grass for 6 years. AG2-2 LP isolates commonly were recovered over all seasons at sites with a history of large patch disease. In patch margins, AG2-2 LP isolates were recovered from crowns of zoysia grass regardless of whether the disease occurred, but were most frequently isolated from the sheath tissues during disease occurrence. In healthy sites approximately 30 cm from the patch, isolates were obtained before but not during disease occurrence. Once disease occurred, patch symptoms rapidly expanded to the edge of tissue colonized by the pathogen during autumn to early spring. To verify that the pathogen spread to healthy areas, the clonal relationship among isolates was examined using their anastomosis reaction. Isolates recovered from the patch and healthy area outside the patch were of the same clone, but isolates from different patches differed. Cultural characteristics and pathogenicity of the AG2-2 LP isolates were compared with R. solani AG2-2 IIIB and R. solani AG2-2 IV. The AG2-2 LP isolates showed an irregular cluster of mycelia (not sclerotia), an irregular zonation, dark brown main hyphae, and sparse aerial hyphae on potato dextrose agar after 4 weeks of incubation. Optimum temperature for growth was 23°C. Cultural characteristics of AG2-2 subgroups IIIB and IV differed from LP isolates. All isolates of AG2-2 LP caused moderate to high levels of disease on zoysia grass, but were nonpathogenic or caused little disease on bent grass and sugar beet. These results indicate that cultural characteristics and host range of AG2-2 LP are different than those of AG2-2 IIIB and AG2-2 IV.

scholarly journals Isolation of Pythium Species from Zoysia Grass and Their Effect on Severity of Large Patch Disease

Plant Disease ◽  
1999 ◽  
Vol 83 (2) ◽  
pp. 171-175 ◽  
Author(s):  
A. Aoyagi ◽  
K. Kageyama ◽  
M. Hyakumachi
Keyword(s):  
Rhizoctonia Solani ◽  
Disease Severity ◽  
Golf Courses ◽  
Pythium Species ◽  
Symptom Development ◽  
Large Patch ◽  
Disease Symptoms ◽  
History Of ◽  
Patch Disease

Pythium periplocum, P. rostratum, P. torulosum, and P. vanterpoolii were predominant Pythium species isolated from nine sites with a history of large patch disease of zoysia grass. Rhizoctonia solani AG2-2 LP and the Pythium species were isolated from 21 sod samples of zoysia grass exhibiting large patch symptoms in five golf courses. R. solani AG2-2 LP was obtained from all samples, while P. periplocum, P. rostratum, P. torulosum, and P. vanterpoolii were obtained from 14, 6, 11, and 8 samples, respectively. At least one of the four Pythium species was recovered from 19 samples. To verify pathogenicity of these four species of Pythium on zoysia grass, they were inoculated alone and together with R. solani AG2-2 LP on zoysia grass. When individual isolates were used to inoculate zoysia grass, R. solani AG2-2 LP, P. periplocum, and P. vanterpoolii were moderately aggressive, while P. torulosum and P. rostratum caused little or no disease. Symptoms produced by R. solani AG2-2 LP included orange discoloration of the sheath, and the sheath was easily pulled from the crown. P. periplocum and P. vanterpoolii induced only sheath chlorosis, and the sheath was not easily removed from the crown. In coinoculation tests, the combination of R. solani AG2-2 LP and P. torulosum intensified disease severity on zoysia grass and induced more rapid symptom development than did R. solani AG2-2 LP alone. The combination of R. solani AG2-2 LP and P. periplocum or P. vanterpoolii resulted in sheath necrosis and bare patches, similar to large patch symptoms observed on golf courses.

scholarly journals Influence of Management Practices on Rhizoctonia Large Patch Disease in Zoysiagrass

HortScience ◽  
1994 ◽  
Vol 29 (3) ◽  
pp. 186-188 ◽  
Author(s):  
D.E. Green ◽  
J.D. Fry ◽  
J.C. Pair ◽  
N.A. Tisserat
Keyword(s):  
Rhizoctonia Solani ◽  
Disease Severity ◽  
Management Practices ◽  
Field Studies ◽  
Large Patch ◽  
N Sources ◽  
N Source ◽  
Application Rates ◽  
Patch Disease ◽  
Preemergence Herbicides

Mowing heights from 1.2 to 5.1 cm, five N sources with two application rates (74 and 148 kg N/ha per year), and seven preemergence herbicides were evaluated in field studies in Manhattan and Wichita, Kan., for their effect on large patch disease, caused by Rhizoctonia solani Kuhn AG 2-2, in zoysiagrass (Zoysia spp.). Turf mowed at 1.2 and 2.5 cm was more severely blighted than turf mowed at 4.5 or 5.1 cm. At all mowing heights, turf recovered by August or September. Disease severity was not influenced by N source, N rate, or preemergence herbicides.

First report of Rhizoctonia solani AG-2-2 IV causing large patch disease of Japanese lawn grass in India

2020 ◽  
Vol 102 (4) ◽  
pp. 1351-1352
Author(s):  
Arghya Banerjee ◽  
Saidul Islam ◽  
Koushik Banerjee ◽  
Debashis Rana ◽  
Krishna Ray ◽  
...  
Keyword(s):  
Rhizoctonia Solani ◽  
Large Patch ◽  
First Report ◽  
Patch Disease

LINGVOCULTURAL PROPERTIES OF PHRASEOLOGICAL UNITS

2020 ◽  
Vol 3 (3) ◽  
pp. 77-82
Author(s):  
Nodirabegim Tursunova ◽  
Keyword(s):  
Cultural Characteristics ◽  
History Of

In this article, it was initially noted that phraseology is an universal unit of language, an important component that increases the richness of the language vocabulary. However, in addition to the international phraseological units, it is illustrated by the fact that it belongs only to a particular ethnos, peoples, and some English and Uzbek phraseological expressions that express their national and cultural characteristics are considered and analyzed. Such stable associations are a treasure that preserves the nationality and history of any nation

The theory and history of ekphrasis. A summary and prospects of research, or, forty-five articles on ekphrasis

2019 ◽  
pp. 188-215
Author(s):  
N. M. Perlina
Keyword(s):  
Development Process ◽  
Source Material ◽  
Cross Cultural ◽  
Cultural Characteristics ◽  
Literary Evolution ◽  
History Of ◽  
Written Word ◽  
Similar Development

The article is devoted to ekphrasis, its historical and literary evolution, as well as aspects of its stylistic, cultural, and ideological origins. The research is based on the versatile collection of The Theory and History of Ekphrasis [Teoriya i istoriya ekfrasisa], which contains a number of previously little known texts and theories on ekphrasis, developed in regions with different ethnic and cultural characteristics. The author spares no effort in the examination of this monograph and, using the observations made by various scholars, discerns a similar development process of cross-cultural and cross-aesthetic transformations and transpositions, which, however, adopts divergent paths. Transpositions, the author suggests, occur in the model of a text awaiting a pictorial interpretation. The article concentrates on the ways to present an image anticipated in a written word, and to generate a new text, whose subject and content draw not only on poeticized observations of the source material, but also on metapoetic tales about its creators.

Detection of Rhizoctonia solani AG-2-2 IV, the Causal Agent of Large Patch of Zoysiagrass, Using Plasmid DNA as a Probe.

1998 ◽  
Vol 64 (5) ◽  
pp. 451-457 ◽  
Author(s):  
Susumu TAKAMATSU ◽  
Manami NAKANO ◽  
Hideyuki YOKOTA ◽  
Hitoshi KUNOH
Keyword(s):  
Rhizoctonia Solani ◽  
Plasmid Dna ◽  
Causal Agent ◽  
Large Patch

Peanut Web Blotch: I. Cultural Characteristics and Identity of Causal Fungus1

1984 ◽  
Vol 11 (2) ◽  
pp. 109-114 ◽  
Author(s):  
R. A. Taber ◽  
R. E. Pettit ◽  
G. L. Philley
Keyword(s):  
South Africa ◽  
Cultural Studies ◽  
Mycelial Growth ◽  
Fungal Species ◽  
Optimum Temperature ◽  
Cultural Characteristics ◽  
Foliar Disease ◽  
The Usa

Abstract A foliar disease of peanuts, previously unreported in the USA, was found in Texas in 1972. The pathogen was identified as a species of Ascochyta. Further cultural studies have revealed this fungus to be Phoma arachidicola Marasas, Pauer, and Boerema. Pycnidia form profusely at 20 C and 25 C. Pycnidiospores are borne on short pycnidiosphores and are predominantly one-celled in culture. Spores produced in pycnidia on infected leaflets become 1 septate. Large 1-septate spores, as well as an occasional 2-septate spore, may form in culture. Optimum temperature for mycelial growth in 20 C; little or no growth occurs at 5 C or above 30 C. The teleomorphic state develops in the field on fallen leaflets and can be induced to form in the laboratory on sterilized peanut leaflets between 15 and 20 C. Cultures derived from single ascospores form pseudothecia. Pycnidiospores, ascospores, and chlamydospores are all infective units. Because this fungus produces hyaline ascospores and pseudoparaphyses, it has been transferred to the genus Didymella as Didymella arachidicola (Choch.) comb. nov. Comparisons with 15 isolates causing web blotch of peanut in the USA, Argentina, and South Africa indicate that web blotch symptoms are produced by the same fungal species.

Chrysophycean Microfossils Provide New Insight into the Recent History of a Naturally Acidic Lake (Cone Pond, New Hampshire)

1987 ◽  
Vol 44 (9) ◽  
pp. 1584-1588 ◽  
Author(s):  
Katherine N. Gibson ◽  
John P. Smol ◽  
Jesse Ford
Keyword(s):  
New Hampshire ◽  
Early Spring ◽  
Recent Change ◽  
Fish Populations ◽  
Short Term ◽  
Acidic Lake ◽  
Lake Water Chemistry ◽  
History Of ◽  
Early Snowmelt ◽  
Insight Into

Cone Pond, New Hampshire, is an acidic (pH = 4.5) clearwater lake that is currently fishless. Historical records indicate declining fish populations between 1951 and 1966, but paleolimnological work using diatoms failed to find evidence for further recent acidification of this naturally acid site. We initiated new paleolimnological studies using mallomonadacean chrysophytes to further our understanding of Cone Pond's recent past. Our stratigraphic analyses indicate recent striking changes in the chrysophyte flora of this lake, with Mallomonas hindonii, a species only common in recently acidified lakes, replacing M. crassisquama, a cosmopolitan species that dominated the flora over the preceding 8000 yr; this recent change parallels the declines in fish populations. Because chrysophytes often bloom in early spring and are known, in other lakes, to experience changes in community composition before those expressed by the diatom community, a possibility is that chrysophytes track transient excursions of lake water chemistry associated with early snowmelt conditions. In this scenario, chrysophytes would respond to a constellation of specific short-term chemical changes including, but not restricted to, pH. Such pH associated changes could include changes in concentrations, speciation, or complexation of metals mobilized from the catchment or sediments, all of which are known to affect both chrysophytes and fish.

scholarly journals ETHNONYM JURCHEN IN THE CONTEXT OF HISTORY AND ARCHAIC BELIEFS OF THE PEOPLE (BASED ON THE WORKS OF CHINESE RESEARCHERS)

2020 ◽  
pp. 19-25
Author(s):  
MARINA A. KHAYMURZINA ◽  
Keyword(s):  
Religious Beliefs ◽  
Ethnic Relations ◽  
Chinese Characters ◽  
Cultural Characteristics ◽  
Local Language ◽  
The People ◽  
History Of ◽  
Available Information

The name of the people reflects a lot - the history of inter-ethnic relations, cultural and language contacts, religious beliefs. The difficulty of studying the origin, sound and meaning of a name is due to the lack or insufficiency of language material. There are various hieroglyphic records of the Jurchen ethnonym. Such diversity is determined by time, place, local language and the choice of Chinese characters to fix the name of this community. However, the sound of all hieroglyphic records of the Jurchen name is almost identical. The word Jurchen is also recorded in Jurchen language. Available information indicates that the meaning of the Jurchen name is «gold». The meaning as «Eastern falcon/eagle» is also take a place, it reflecting the cultural characteristics of the Jurchens, their ethnic spirit and primitive religious beliefs.

Entrepreneurship in Transition Economies: Is There an Entrepreneurial Characteristic Similarity to Western Entrepreneur?

2018 ◽  
Vol 19 (2) ◽  
pp. 105-157
Author(s):  
Thomas Bradley ◽  
Paul Eberle
Keyword(s):  
Empirical Study ◽  
Cultural Values ◽  
Cultural Differences ◽  
Transition Economies ◽  
Transition Period ◽  
Entrepreneurial Activity ◽  
Cultural Dimension ◽  
Factory Workers ◽  
Cultural Characteristics ◽  
History Of

This empirical study consists of two parts. The first part of the study examines the cultural characteristics and dimensions of entrepreneurs and factory workers in transition economies during the early transition period to determine if their cultural values were similar to those found in other nations. The second part of the study compares the differences in Hofstede’s cultural dimension scores between entrepreneurs and workers in market economies. It might seem extraordinary that after more than 70 years of a centralized nonentrepreneurial society that all of the communist nations that the current authors studied had essentially the same cultural differences among entrepreneurs that were found in capitalist nations with a long history of entrepreneurial activity.

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