26 Result(s)
within
Yuichi Yamaoka
Microbiology
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Article
Infection through wounds on shoots of pine seedlings by basidiospores of Cronartium orientale
Cronartium orientale is a heteroecious rust fungus that causes pine gall rust of two-needle pines, e.g., Japanese black pine (Pinus thunbergii) and Japanese red pine (Pinus densiflora). Basidiospores are discharg...
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Article
Control efficacy of the systemic acquired resistance (SAR) inducer acibenzolar-S-methyl against Venturia nashicola in Japanese pear orchards
Scab caused by Venturia nashicola is one of the most serious diseases of Asian pears, and conventional fungicides used to control scab can lose their efficacy when fungicide-resistant strains develop. In contrast...
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Article
A morphological and molecular survey of Japanese Melampsora species on willows reveals a new species and two new records
During morphological and molecular phylogenetic studies of Melampsora species on willows, one novel species, Melampsora salicis-reinii sp. nov., and two new records, M. ribesii-viminalis and M. ribesii-purpureae,...
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Article
Two new species and one new record of Melampsora on willows from China
Two new species of rust fungi, Melampsora salicis-purpureae sp. nov. and M. salicis-argyraceae sp. nov., and a new record, M. iranica, are described from China based on morphological characteristics and molecular...
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Article
Recent outbreaks of rust diseases and the importance of basic biological research for controlling rusts
Rust fungi are obligate plant parasites belonging to the order Pucciniales; they comprise about 7,800 species throughout the world. Some species seriously damage crops, vegetables, fruits and trees. Of these s...
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Article
Pathogenic races of soybean rust Phakopsora pachyrhizi collected in Tsukuba and vicinity in Ibaraki, Japan
Six races were identified among 26 single-lesion isolates of Phakopsora pachyrhizi from rust-infected leaves of nine samples of cultivated soybean and one sample of the wild host plant kudzu (Pueraria lobata) col...
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Article
Pathogenic diversity of soybean rust in Argentina, Brazil, and Paraguay
Phakopsora pachyrhizi, the cause of soybean rust, is an economically important pathogen of soybean in South America. Understanding the pathogenicity of indigenous fungal populations is useful for...
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Article
Phakopsora montana, another grapevine leaf rust pathogen in Japan
A new grapevine leaf rust (GLR) was found to be caused by Phakopsora montana. This new fungus naturally infects Crimson Glory vine (Vitis coignetiae), forming uredinia and telia on the leaves. Under experimental ...
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Article
Ophiostomatoid fungi isolated from Japanese red pine and their relationships with bark beetles
We isolated ophiostomatoid fungi from bark beetles infesting Pinus densiflora and their galleries at 24 sites in Japan. Twenty-one ophiostomatoid fungi, including species of Ophiostoma, Grosmannia, Ceratocystiops...
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Article
Constant association of ophiostomatoid fungi with the bark beetle Ips subelongatus invading Japanese larch logs
Ceratocystiopsis, Ceratocystis, Grosmannia, and Ophiostoma species were isolated from Ips subelongatus and beetle-infested Japanese larch logs collected at several areas in central and northern Honshu Island, Jap...
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Article
The teleomorph of Leptographium yunnanense, discovered in crosses among isolates from Thailand, China, and Japan
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Article
The teleomorph of Leptographium yunnanense, discovered in crosses among isolates from Thailand, China, and Japan
A teleomorph was discovered in crosses among isolates of Leptographium yunnanense isolated from Pinus spp. originating in Thailand, China, and Japan. The ascocarps are black, globose to subglobose, and lacking ne...
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Article
Teliospore-inducing activity for wheat leaf rust in the extracts of various host plant leaves infected with telia of rust fungi
MeOH and water extracts were obtained from 16 species of infected leaves with rust fungi belonging to 18 species in 6 families: Pucciniaceae, Melampsoraceae, Coleosporiaceae, Pileolariaceae, Phragmidiaceae, an...
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Article
Two species of Leptographium isolated from blue-stained sapwood of Pinus khasya and bark beetles in Thailand
Two species of Leptographium were isolated from blue-stained sapwood of Pinus khasya and bark beetle galleries in pine trees near Chiang Mai, Thailand. Based on morphological observations, these two species were ...
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Article
Caeoma tsukubaense n. sp., a rhododendron rust fungus of Japan and southern Asia, and its relationship to Chrysomyxa rhododendri
A rust fungus found in Japan on Rhododendron kaempferi, R. kiusianum, and R. dauricum has previously been identified as Chrysomyxa rhododendri. Light and scanning electron microscopy of fresh and herbarium materi...
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Article
Three new Ophiostoma species with Pesotum anamorphs associated with bark beetles infesting Abies species in Nikko, Japan
Three species of Ophiostoma possessing Pesotum anamorphs isolated from bark beetles and their galleries infesting Abies species in Nikko, Japan, are described as new species. Ophiostoma nikkoense is characterized...
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Article
Three new Ophiostoma species isolated from Japanese red pine
Three new species of Ophiostoma found on Japanese red pine are described as Ophiostoma pusillum sp. nov., O. botuliforme sp. nov., and O. nigrogranum sp. nov. Ophiostoma pusillum is characterized by oblong ascosp...
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Article
Correlation between pathogenicity and molecular characteristics in the willow leaf rusts Melampsora epitea and M. humilis in Japan
We studied the correlation between pathogenicity and restriction fragment length polymorphism (RFLP) type, which was determined by polymerase chain reaction-based RFLP analysis of the internal transcribed spa...
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Article
Pathogenic Races of Phakopsora pachyrhizi on Soybean and Wild Host Plants Collected in Japan
A total of 45 single uredinial isolates of Phakopsora pachyrhizi were collected from rust-infected soybean and wild host plants (Pueraria lobata and G. soja ) at different localities in central and southwestern J...
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Article
A substance inducing teliospore production in wheat leaf rust,Puccinia recondita f. sp.tritici
A substance inducing teliospore production inPuccinia racondita f. sp.tritici was found in water and methanol extracts of wheat leaves with telia of the wheat leaf rust just before harvest time. Methanol (MeOH) a...
