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1.
In May 1998 and 1999, two types of leaf spot (black type and brown type) caused by Phoma spp. were found on Farfugium japonicum in Tokyo and in Gunma Prefecture, Japan. The fungus isolated from black-type lesions caused only black-type lesions, and the fungus from brown-type lesions caused only brown-type lesions. We propose to name these diseases black leaf spot of F. japonicum (kokuhan-byo in Japanese) for the disease with black lesions and circular leaf spot of F. japonicum (rinmon-byo in Japanese) for the disease with brown lesions. This is the first report on leaf diseases of F. japonicum caused by Phoma spp. 相似文献
2.
Fangjing Li Gaoqing Yuan Ting Liao Qiqin Li Wei Lin 《Journal of General Plant Pathology》2017,83(4):264-267
In 2014 and 2015, an unknown leaf spot disease was found on tobacco in Guangxi, China. The fungus isolated from these spots was identified as Fusarium proliferatum based on morphological characteristics and sequence analysis of translation elongation factor 1 alpha (tef1α). This fungus also reproduced leaf spot symptoms after inoculation and was reisolated from the symptomatic lesions. This is the first report of a new leaf spot caused by Fusarium proliferatum on tobacco. 相似文献
3.
Shima Bagherabadi Doustmorad Zafari Yousef Moradi Amirabad Joyce H. C. Woudenberg 《Journal of General Plant Pathology》2017,83(6):398-401
Drimia maritima (squill) is a historically important medicinal plant. During the spring of 2016, small, yellow leaf spots, which became brown and finally necrotic, were observed on squill plants in Kohgiluyeh and Boyer-Ahmad Provinces in Iran. A fungus was consistently isolated from infected leaves and identified as Alternaria alternata based on morphological and phylogenetic analyses. Pathogenicity tests confirmed A. alternata to be the causal agent of the newly observed leaf spot disease. This is the first report of leaf spot on D. maritima caused by A. alternata in the world. 相似文献
4.
Toyozo Sato Jun Okamoto Yosuke Degawa Shigeru Matsunari Kokichi Takahashi Keisuke Tomioka 《Journal of General Plant Pathology》2009,75(1):46-51
In some areas of Japan, yellow spots with white pustules on leaves, stems, petioles, peduncles and calyces were found on Ipomoea nil, I. triloba, I. lacunosa and I. hederacea var. integriuscula. We demonstrated that the diseases on I. nil, I. triloba and I. lacunosa were caused by host-specific strains of Albugo ipomoeae-panduratae and defined three forma speciales of the fungus, respectively, for the three Ipomoea species: “f. sp. nile”, “f. sp. trilobae” and “f. sp. lacunosae”. Because the diseases were new to Japan, we coined the Japanese name “shirosabi-byo”, which means white rust. We also showed
that the disease on I. hederacea var. integriuscula was caused by A. ipomoeae-hardwickii. We named this new disease “white rust (shirosabi-byo in Japanese)”. 相似文献
5.
Naho Yamagishi Junji Nishikawa Youichi Oshima Naoki Eguchi 《Journal of General Plant Pathology》2009,75(5):401-403
A black spot disease on cultivated alstroemeria was found in Nagano Prefecture, Japan, in January 2008. The causal fungus
isolated from the diseased plants was morphologically identified as Alternaria alstroemeriae E.G. Simmons & C.F. Hill. An inoculation test with the isolated fungus demonstrated that the disease is caused by this species.
This is the first report of black spot on alstroemeria (kokuhan-byo, in Japanese) caused by A. alstroemeriae in Japan. 相似文献
6.
Maria Lodovica Gullino Giovanna Gilardi Mattia Sanna Angelo Garibaldi 《Phytoparasitica》2009,37(5):461-466
Leaf spot of tomato, incited by Pseudomonas syringae pv. syringae, has been reported recently in Italy on grafted and non-grafted tomato plants (scion Cuore di Bue, rootstock Solanum lycopersicum x Solanum hirsutum cv. Beaufort). In some greenhouses, more than 80% of plants were affected, with a marked reduction in yield. This work was
undertaken in order to understand the effect of the number of hours of incubation at high relative humidity (r.h.) and temperature
as well as the effect of the presence of wounds at infection time on the development of leaf spot. A difference in sensitivity
to leaf spot was observed in the various cultivars tested, in terms of severity of P. syringae pv. syringae, with “Cuore di Bue” being the most susceptible of these cultivars. The development of leaf spot is mostly favored by the
presence of wounds, at temperatures between 15 and 20°C. The severity of the disease is lower at 10 and 25°C and very low
at 30°C. Under the most favorable temperature conditions, the presence of wounds is sufficient to allow the development of
the pathogen immediately upon incubation at high r.h. The effect of wounds and the relatively low requirement of hours of
incubation at high r.h. suggest the need for careful management and handling of plants when temperatures range between 15
and 25°C, and particularly within 15 and 20°C. All operations carried out, particularly at transplant and immediately after,
should avoid the creation of wounds. 相似文献
7.
A smut-like disease was found on the leaves of Sagittaria latifolia in Japan. Spore balls collected from the leaves of S. latifolia and S. trifolia var. edulis were used to cross-inoculate leaves of pathogen-free plants of the two species to identify the pathogen. Spots and swellings
formed on leaves of the two species 10 days after inoculation. These symptoms were quite similar to those of the leaf smut
disease of S. trifolia var. edulis caused by Doassansia horiana, and the spore balls were characteristic of the fungus. Therefore, the authors conclude that D. horiana caused leaf smut disease on S. latifolia.
Received 18 January 2000/ Accepted in revised form 14 May 2000 相似文献
8.
Fumitoshi Yasuda Takao Kobayashi Hiroyuki Watanabe Hiroki Izawa 《Journal of General Plant Pathology》2003,69(1):29-32
In June 1996, a leaf spot disease widely occurred in Japanese persimmon (Diospyros kaki) orchards in Tottori Prefecture, Japan. The main diagnostic symptom was ring spot on the leaves and calyxes of young fruits;
in severe cases, lesions developed on more than half of the area of the leaf, resulting in early defoliation. Based on morphological
and pathological studies of the isolated fungi, it was shown that Pestalotiopsis longiseta, P. glandicola, P. acaciae, and P. crassiuscula were responsible for the diseases. These fungi, except P. longiseta, were found to be new pathogens of the disease.
Received: May 20, 2002 / Accepted: July 25, 2002 相似文献
9.
Shihomi Uzuhashi Nobuaki Ohtaka Yuuri Hirooka Keisuke Tomioka Toyozo Sato 《Journal of General Plant Pathology》2010,76(3):183-187
Foliar wilt as well as crown and root rot with sclerotia formation has affected potted liver leaf (Hepatica nobilis var. japonica f. magna) in Ojiya, Niigata Prefecture, Japan, since 2006. Apothecia developed from the sclerotia on soil surface of pots with the
diseased plants in March. A fungus forming the apothecia was identified as Dumontinia tuberosa (Sclerotiniaceae) based on its morphology and demonstrated to cause the disease. We coined the name “Dumontinia root rot
(Dumontinia-negusare-byo in Japanese) of liver leaf” for the new disease. 相似文献
10.
M. P. You H. A. Yang K. Sivasithamparam M. J. Barbetti 《European journal of plant pathology / European Foundation for Plant Pathology》2009,123(1):99-103
A new disease was observed on Trifolium dasyurum, with symptoms beginning as a halo spot and developing into a leaf blight. The causal organism was identified by microscopy
and DNA sequence studies as Botrytis fabae. This strain of B. fabae was also demonstrated to cause disease on foliage of a range of pulse crops, including Vicia faba, Pisum sativum, and Lens culinaris. This study demonstrates the potential of this strain of B. fabae to not only pose a significant threat to T. dasyurum but also to pulses grown in rotation with T. dasyurum that are susceptible to this strain of B. fabae. 相似文献
11.
Masashi Fujinaga Naho Yamagishi Hideki Ogiso Jun Takeuchi Jouji Moriwaki Toyozo Sato 《Journal of General Plant Pathology》2011,77(4):243-247
A new disease was found in Japan, on celery (Apium graveolens var. dulce) having severe chlorotic leaf spot, stunt, and dwarf with leaf curl. A spore suspension from the fungus isolated from affected
plants induced identical symptoms 14 days after plants were sprayed. Identification and molecular characterization showed
that the causal agent is Colletotrichum simmondsii. This report is the first of stunt anthracnose on celery caused by C. simmondsii. We propose the name “stunt anthracnose” for the new disease. Colletotrichum acutatum sensu lato, as reference pathogen of celery anthracnose, should be changed to C. fioriniae based on morphological and molecular characteristics. 相似文献
12.
Christian Falter Christian A. Voigt 《European journal of plant pathology / European Foundation for Plant Pathology》2017,149(4):797-806
Miscanthus x giganteus is a fast growing, perennial energy crop for temperate climates. Because of its high annual biomass production rates and its characteristics as a low-input crop, an expansion of field cultivation can be anticipated to cover increasing demands for sustainable biomass production. However, knowledge about pathogens that could have an impact on biomass production is still limited for M. giganteus. Here, we report about the isolation of the filamentous fungus Apinisia graminicola from necrotic leaf lesions of M. giganteus grown on a field trial plot in Northern Germany. Inoculation assays with the isolated A. graminicola strain confirmed its capacity to cause a leaf spot disease on M. giganteus. Additional inoculation assays revealed that A. graminicola also caused necrotic lesions on leaves of the model grass Brachypodium distachyon. Generally, symptoms of A. graminicola-caused leaf spot disease were stronger on B. distachyon compared to M. giganteus. Incubation temperatures above 22 °C during A. graminicola infection resulted in stronger disease symptoms on both, M. giganteus and B. distachyon leaves. Microscopic analysis of cross sectioned, infected leaf tissue revealed an epiphytic mycelium formation on the surface and an endophytic colonization of the mesophyll leave tissue, especially in M. giganteus. Our results revealed that the isolated A. graminicola strain is a causal agent of a leaf spot disease on grass leaves. Its potential on endophytic growth in M. giganteus might open new possibilities in studying this type of plant-fungal interaction on a cellular and molecular level in an energy crop. 相似文献
13.
Black Spot of Peach Caused by <Emphasis Type="Italic">Alternaria alternata</Emphasis> (Fr.) Keissler
A new disease of peach (Prunus persica Batsch var. vulgaris Maxim.), causing brown, sunken lesions and brownish to blackish brown spots with cracks on peach fruits, was found in Okayama
prefecture, Japan, in 1995. The disease was observed not only on peach fruits but also on twigs and leaves. An Alternaria sp. was consistently isolated from these diseased fruits, twigs and leaves. The isolates were pathogenic to peach fruits
and leaves. Based on the morphological characteristics, the causal fungus was identified as Alternaria alternata (Fr.) Keissler. After cross-inoculation with isolates from peach, Japanese pear and apple, the isolates were found to be
pathogenic only to their original host. This is the first report on a peach disease caused by a host-specific A. alternata; therefore, the common name of black spot (`Kokuhanbyo' in Japanese) was proposed.
Received 25 June 1999/ Accepted in revised form 12 October 1999 相似文献
14.
Masayuki Nakamura Yuki Hayasaki Seiji Ryosho Hisashi Iwai 《Journal of General Plant Pathology》2008,74(1):86-87
Severe leaf spots were found on the ornamental plant, belmore sentry palm (Howea belmoreana), grown in pots in a greenhouse in Ibusuki, Kagoshima, Japan in 2006. The isolated fungus caused the same symptoms after
artificial inoculation and was identified morphologically and molecularly as Colletotrichum gloeosporioides. In this first report of the disease, the name anthracnose of belmore sentry palm (kenchayashi-tanso-byo in Japanese) is proposed. 相似文献
15.
Fatma F. Abdel-Motaal Magdi A. El-Sayed Soad A. El-Zayat Mortada S. M. Nassar Shin-ichi Ito 《Journal of General Plant Pathology》2009,75(6):437-439
Severe brown spots caused by Cladosporium herbarum appeared on the leaves of Hyoscyamus muticus (Egyptian henbane) grown in a greenhouse at Yamaguchi city, Japan, in the summer of 2008. Nucleotide sequence analysis of
rDNA-ITS and 28S rDNA supported the morphological identification of the isolate, which caused the same disease symptoms after
reinoculation of the host. This new disease was named “Cladosporium leaf spot of Egyptian henbane”. 相似文献
16.
The population dynamics of Monosporascus cannonballus ascospores in the soils of four muskmelon fields located in a marsh area in Castellón province (eastern Spain) was studied
for a 3 year period. Two of these fields were cropped to muskmelon with fallow periods between muskmelon cropping, and the
others were in fallow and had extensive flooding periods. Muskmelon cultivation resulted in a progressive increase of the
number of ascospores in soil, reaching a maximum 7 months after muskmelon planting (2–4 months after plant death), and a subsequent
decline during fallow periods between muskmelon crops. During muskmelon cropping, in-bed and between-bed ascospore numbers
were compared and, in general, there were no statistical differences between them. In the fields which were in fallow and
flooded, the dynamics found was a progressive decline of the population of ascospores. Soilborne inoculum was viable and capable
of infecting muskmelon at the end of the 3 year period in all fields, demonstrating that ascospores of M.␣cannonballus are able to survive for this period of time in the absence of muskmelon cultivation and also that this fungus seems to be
well adapted to survive in soils which maintain a high water table during the crop or under flooding conditions. 相似文献
17.
Helena Olczak-Woltman Małgorzata Schollenberger Wiesław Mądry Katarzyna Niemirowicz-Szczytt 《European journal of plant pathology / European Foundation for Plant Pathology》2008,122(3):385-393
Increased occurrence of cucumber angular leaf spot, Pseudomonas syringae pv. lachrymans, has caused significant losses in cucumber, Cucumis sativus, yield in Poland in recent years. These losses necessitated evaluation of the level of resistance in cucumber cultivars of
mainly Polish breeding, cultivated in Eastern Europe, and initiation of a breeding programme for resistance to this disease.
Screening for resistance was performed on 84 cucumber accessions under growth chamber conditions using a highly aggressive
strain of P. syringae pv. lachrymans. Most of the screened accessions were either susceptible or displayed intermediate resistance. The screening resulted in
the identification of five F1 hybrid cultivars moderately resistant to angular leaf spot. The identified F1 hybrids were self-pollinated up to the F4 generation. Individuals resistant to angular leaf spot were identified. These individuals can be used as a source of resistance
to angular leaf spot in future breeding efforts. 相似文献
18.
Toshiko Furukawa Kinji Ushiyama Kunihei Kishi 《Journal of General Plant Pathology》2008,74(2):117-119
A leaf spot disease of scarlet sage (Salvia splendens Sellow ex J.A. Shultes) found in Kanagawa and Tokyo prefectures was demonstrated to be caused by Corynespora cassiicola (Berk. and Curt.) Wei based on inoculation experiments, and morphological identification of the pathogenic fungus. Isolates
of C. cassiicola from cucumber, green pepper, and hydrangea were also pathogenic to scarlet sage leaves. Although the isolates from cucumber,
green pepper, and hydrangea were pathogenic to scarlet sage leaves, the scarlet sage isolate was not pathogenic to cucumber,
green pepper, hydrangea, eggplant, tomato or soybean. 相似文献
19.
Nahoko Nishi Tatsuro Muta Yoko Ito Masayuki Nakamura Takao Tsukiboshi 《Journal of General Plant Pathology》2009,75(1):80-82
A new disease of chrysanthemum causing ray speck was found in Okinoerabu island, Kagoshima, Japan in March 2006. Small reddish-brown
lesions were observed on the ray florets of the chrysanthemum (cv. Anastasia). The causal fungus was exclusively isolated
from the lesions, and typical symptoms were reproduced after inoculation with the isolate. The causal fungus was identified
as Stemphylium lycopersici (Enjoji) Yamamoto based on morphology and the sequences of rDNA-ITS and the gpd gene regions. The name, “sho-hanten-byo”, in Japanese is proposed for this ray speck disease. 相似文献
20.
From the genome of a Japanese field isolate of the rice blast fungus, Magnaporthe oryzae, we newly identified Inago1 and Inago2 LTR retrotransposons. Both elements were found to be Ty3/gypsy-like elements whose copies were dispersed within the genome of Magnaporthe spp. isolates infecting rice and other monocot plants. Southern hybridization patterns of nine re-isolates derived from conidia
of the strain Ina168 produced after a methyl viologen treatment were not changed, indicating that the insertion pattern of
Inago elements is relatively stable. 相似文献