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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Research in Plant Disease
Journal Basic Information
Journal DOI :
Korean Society of Plant Pathology
Editor in Chief :
Volume & Issues
Volume 11, Issue 2 - Dec 2005
Volume 11, Issue 1 - Jun 2005
Selecting the target year
Review of Disease Incidence of Major Crops of the South Korea in 2004
Myung Inn-Shik ; Park Kyung-Seok ; Hong Sung-Kee ; Park Jin-Woo ; Shim Hong-Sik ; Lee Young-Kee ; Lee Sang-Yeop ; Lee Seong-Don ; Lee Su-Heon ; Choe Hong Su ; Choi Hyo-Won ; Heu Sunggi ; Shin Dong-Bum ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 89~92
DOI : 10.5423/RPD.2005.11.2.089
In 2004, average temperature was higher, and rainfall was less than those of previous year, The diseases of rice, barley, pepper, chinese melon, apple and oriental pear were surveyed. Seedling diseases, leaf blast, sheath blight and bacterial blight of rice, phytophthova blight, virus diseases and anthracnose of pepper, and sudden wilt syndrome and powdery mildew of chinese melon grown in plastic greenhouse were severe. Especially, sheath blight and bacterial blight of rice occurred two times higher than those of previous year, Panicle blight of rice decreased about 4 times, compared with the previous year, presumed that the lower rainy days, rainfall and RH suppressed spread of the fungal pathogens to panicles of rice. Lower rainfall during mid- and late Aug caused three-times less occurrence of phytophtora blight of red-pepper than that of the previous year, Another diseases surveyed occurred similar or less than those of the previous year.
Detection of Fungi Associated with Rice Ear Blight from Rice Seeds in Korea
Shim Hong-Sik ; Hong Sung-Gi ; Hong Sung-Jun ; Kim Yong-Ki ; Ye Wan-hae ; Sung Jae-Mo ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 93~97
DOI : 10.5423/RPD.2005.11.2.093
In order to detect casual agents associated with ear blight of rice, seed samples of `Ilmi-byeo` and `Daesan-byeo`, susceptible cultivars were collected from 28 regions on a nationwide scale. Finally 23 fungi including Bipolaris oryzae(
), Alternaria alternata (
), Cladosporium sp. (
), Nigrospora oryzae(
) and Phoma sorghina (
) from seeds of `Ilmi-byeo`, and 13 fungi including N. oryzae (
), A. alternata (
) and Curvularia lunata (
) from seeds of `Daesan-byeo` were detected. In case of discolored seeds caused by rice ear blight, B. oryzae(
), A. alternata (
), Fusarium graminearum (
), N. oryzae(
) and P. sorghina (
) were detected even from the hulled rice of Ilmi-byeo.
The Importance of Host Factors for the Replication of Plant RNA Viruses
Park Mi-Ri ; Kim Kook-Hyung ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 98~105
DOI : 10.5423/RPD.2005.11.2.098
All viruses have few genes relative to their hosts. Viruses, thus, utilize many host factors for efficient viral replication in host cell. Virus-host interactions are crucial determinations of host range, replication, and pathology. Host factors participate in most steps of positive-strand RNA virus infection, including entry, viral gene expression, virion assembly, and release. Recent data show that host factors play important roles in assembling the viral RNA replication complex, selecting and recruiting viral RNA replication templates, activating the viral complex for RNA synthesis, and the other steps. These virus-host interactions may contribute to the host specificity and/or pathology. Positive-strand RNA viruses encompass over two-thirds of all virus genera and include numerous pathogens. This review focuses on the importance of host factors involved in positive strand plant RNA virus genome replication.
Breeding for Powdery Mildew Resistant Varieties in Cucurbita moschata
Cho Myeong-Cheoul ; Om Young-Hyun ; Kim Dae-Hyun ; Heo Yun-Chan ; Kim Jeong-Su ; Park Hyo-Guen ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 106~114
DOI : 10.5423/RPD.2005.11.2.106
To breed powdery mildew resistant varieties, 104 accessions of Cucurbita spp. germplasm were evaluated. Powdery mildew resistance and horticultural characteristics of the accessions were investigated in the field conditions. C. martinezii was selected for high resistance to powdery mildew in the field. The growth of powdery mildew pathogen and response of leaf surface tissue to the pathogen were observed after artificial inoculation to resistant C martinezii and susceptible C. moschata cv. `Wonye No.402`. Mycelium growth was very clearly different between resistant C. martinezii and susceptible C moschata cv. `Wonye No. 402` at 5 days after inoculation at the adult stage. Interspecific hybridization was attempted to transfer powdery mildew resistance gene(s) from C. martinezii to C. moschata. A single dominant gene action was postulated as deter mining powdery mildew resistance at the seedling stage. But for the effective selection of powdery mildew resistant individuals, it was established that adult plant resistance should be confirmed in the field conditions after the seedling test. Through the seedling and field tests, C. moschata lines resistant to powdery mildew and superior to horticultural characteristics, were selected after 2 backcrossing and 3 selfing generations. The fruit characteristics of newly developed lines were similar to those of the recurrent parent, `Jaechenjarae`.
Effective Usage of Copper Fungicides for Environment-friendly Control of Citrus Diseases
Hyun Jae-Wook ; Ko Sang-Wook ; Kim Dong-Hwan ; Han Seung-Gab ; Kim Kwang-Sik ; Kwon Hyeog-Mo ; Lim Han-Cheol ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 115~121
DOI : 10.5423/RPD.2005.11.2.115
This studies were carried out to elucidate the control effect of copper fungicides against some citrus diseases, assess copper spray injury on leaf and fruit of citrus by spraying of copper fungicides according to growth stages and spray seasons and by tank mixing with paraffin oil in field experiments for 3 years (2003-2005 season). As results, the control value was approximately
against scab disease in all tested copper fungicides,
to canker and
to melanose. In case of leaf, the copper injury was the severest in early stage of shooting, and the injury was gradually weakened according to growth of leaf. In fruit, the copper injury was more severe in midsummer (late of July and August) than early of summer and spring season (June and ealy of July). Among copper fungicides, the bordeaux mixture which made by level of farm induced more injury compared to other copper fungicides commercialized. Less copper spray injury was observed on treatments in which copper fungicide was sprayed as tank mixtures with paraffin oil when compared to treatment which sprayed with only copper fungicide.
Disease Progress and Yield Loss of Potato Late Blight Caused by Pntytophthora Infestans in Organic Farming Fields
Ryu Kyoung-Yul ; Jee Hyeong-Jin ; Choi Do-Hoi ; Cheon Jeong-Uk ; Kim Jong-Tae ; Kim Byung-Sup ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 122~127
DOI : 10.5423/RPD.2005.11.2.122
Late blight of potato caused by Phtophthora infestans is one of the most destructive disease in organic farming as well as in the conventional cultivation in Korea. Incidence and progress of the disease largely depend on climatic conditions around the fields. However, the disease completely destroys whole leaves of the plant within two weeks in organic farming fields. While, potato leaves in conventional farming fields remain healthy for 5 weeks after the first symptom appearance, because fungicides were applied four times in average to control the disease. Area under disease progress curve (AUDPC) of organic farming fields ranged from 2314 to 2421 and quickly expanded compare to that of conventional farming fields. The tuber yield in the organic farming fields ranged from 0.96 ton per 10a to 1.5 ton per 10a, while it was 2.7 ton per 10a in conventional farming fields. Tuber yields were reduced to
by the infection of late blight and the reduction rate was closely related with the time of first occurrence of the disease in organic farming fields. Physiological races of the pathogen were diversified with R0,1,3,4,5,7,10,11 in organic farming fields at Hongchun area. Pathogen races were distributed with similar pattern at different areas of organic farming fields.
Environmental factors Associated with Disease Development of Garlic White Rot Caused by Two Species of Sclerotium
Kim Yong-Ki ; Kwon Mi-Kyung ; Shim Hong-Sik ; Kim Tack-Soo ; Yeh Wan-Hae ; Cho Weon-Dae ; Choi In-Hu ; Lee Seong-Chan ; Ko Sug-Ju ; Lee Yong-Hwan ; Lee Chan-Jung ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 128~134
DOI : 10.5423/RPD.2005.11.2.128
This study was conducted to elucidate effect of environmental factors on the development of white rot. In order to identify the causal agents causing white rot of Allium crops, we compared DNA profiles of a representative isolate, Sclerotium cepivorum, introduced from foreign country with Korean isolates using UP-PCR. As a result, Sclerotium isolates forming round-shaped sclerotia were identified as Sclerotium cepivorum pertaining in UP-PCR b group and Sclerotium isolates farming anamorphic-shaped sclerotia presumed to be a novel species of Sclerotium based on DNA profiles of UP-PCR. There was a big difference in DNA band pattern between two species of Sclerotium isolated in Korea. Electron micrographs of scanning electron microscope and transmission electron microscope showed morphological differences in sclerotial surface structure and rind layers between two species of Sclerotium. There were more wrinkles and pore spaces on sclerotial surface of Sclerotium sp. forming anamorphic-shaped sclerotia than that of Sclerotium cepivorum forming round-shaped sclerotia. Both of two white rot pathogens grew well at the temperature range of
with optimal temperature of
. Sclerotia of the two pathogens were well formed at
and well germinated at the temperature range of
, Effect of pre-incubation of sclerotia on destruction of sclerotial dormancy of two pathogens was evaluated through storing sclerotia under different temperature condition. The sclerotia of the two pathogens showed an increased capacity to germinate on potato dextroise agar when the sclerotia were incubated for 7 days at
after pre-treatment at
for 7 days. At that time, germination rate of Sclerotium sp. and 5. cepivorum was
, respectively. Flooding period and treatment temperature had an effect on sclerotial survival rate of the two pathogens. As flooding period and treatment temperature increased, sclerotial germination rate of the two pathogens decreased. It was confirmed that soil humidity played an important role on development of white rot. It was the highest disease incidence of garlic white rot when garlic were sown at potted soils infested with the two pathogens and adjusted soil humidity to
(field moisture capacity, about -300 mb). As soil humidity increase or decrease based on
of soil humidity, disease incidence decreased move and more.
Bacterial Canker of Japanese Apricot (Prunus mume) Caused by Pseudomonas syringae pv. morsprunorum
Kim Doo Young ; Han Hyo Shim ; Koh Young Jin ; Jung Jae Sung ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 135~139
DOI : 10.5423/RPD.2005.11.2.135
Bacterial canker of Japanese apricot (Prunus mume Sieb. et Zucc.) was found in all orchards located at southern area of Korea. Typical symptoms were characterized by dark spots formed on fruits, brown lesions on leaves, and bacterial exudate oozed out of the cracked bark of diseased tree. Thirty-eight isolates from 16 different areas were identified on the basis of biochemical and physiological characteristics (LOPAT and GATTa test) and also on the basis of 165 rDNA and ITS sequences. Pathogenicity tests confirmed that bacterial canker of Japanese apricot in Korea is caused by Pseudomonas syringae pv. morsprunorum.
Genetic Characterization of Potato Blackleg Strains from Jeju Island
Seo Sang-Tae ; Lee Seungdon ; Lee Jung-Sup ; Han Kyoung-Suk ; Jang Han-Ik ; Lim Chun-Keun ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 140~145
DOI : 10.5423/RPD.2005.11.2.140
A collection of 12 Erwinia carotovora strains from blackleg diseased potato in Jeju island was characterized genetic diversity by 5. cayotovora subsp. atposeptica (Eca)-specific PCR, PCR-RFLP of the two genes (16S rRNA and pel) and repetitive sequence PCR (ERIC-PCR). The results were compared with those of the other E. carotovora representative strains. None of the blackleg strains produced PCR amplicons with Eca-specific primers in contrast to the single 690 bp amplicon obtained with Eca strains. In addition, on the basis of pel gene RFLP with Sau3AI, the blackleg strains belonged to the pattern 2 whereas Eca strains belonged to the other one (pattern 3). By analysis of 16S rDNA RELP generated with HinfI, the most strains including the E. carotovera subsp. carotovora (Ecc) representative strains used in this study belonged to the pattern 1 whereas the blackleg strains belonged to the pattern 2 except for one strain. Moreover, ERIC-PCR analysis showed that the blackleg strains were closely related to each other and had an unique DNA band. Based on these molecular approaches, we have confirmed that the blackleg disease of potato is caused by a different E. carotovora from Eca and Ecc in Jeju island.
Bacterial Blight of Sesame Caused by Xanthomonas campestris pv. sesami
Lee Seung-Don ; Lee Jung-Hee ; Kim Yong-Ki ; Heu Sung-Gi ; Ra Dong-Soo ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 146~151
DOI : 10.5423/RPD.2005.11.2.146
A new bacterial disease of sesame(Sesamum indicum) was observed on field-grown plants in Suwon, Hongchun and Yeonchun in 2000. Leaf symptoms initially appeared as water-soaked spots that gradually enlarged, became necrotic and were often bordered by a small zone of lemon yellow tissue. In the case of severe infection, dead leaves were defoliated. Isolations made from diseased leaves on yeast extract dextrose calcium carbonate agar yielded nearly pure cultures of a yellow-pigmented bacterium typical of a xanthomonad. Two bacterial strains were purified and used for farther tests. Pathogenicity of strains was confirmed on 3-week-old sesame plants sprayed with bacterial suspensions containing
of phosphate buffered saline. The Biolog and fatty acid analyses of the two strains(SL3451 and SL3476) 1mm sesame leaf blight showed that they could be identified as ft campestris pv. sesami because of their high similarity to the tester strain(X. campestris pv. sesami LMG865) with a match probability of
. The bacterium grew well between 18 and 36
, but optimum temperature was
on LB broth. This is the first report of bacterial blight of sesame in Korea. Symptoms of bacterial blight of sesame are difficult to differentiated with those of bacterial leaf spot caused by Pseudomonas syringae pv. sesami.
Isolation and Identification of Stenotrophomonas maltophilia BW-13 Active Against Rhizoctonia solani Causing Crisphead Lettuce Bottom Rot
Kim Han-Woo ; Park Jong-Young ; Kim Hyun-Ju ; Lee Kwang-Youll ; Lee Jin-Woo ; Choi Woobong ; Lee Seon-Woo ; Moon Byung-Ju ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 152~157
DOI : 10.5423/RPD.2005.11.2.152
In a course of searching for biofungicide to control crisphead lettuce bottom rot caused by Rhizoctonia solani, we have isolated an antagonistic bacterium from lettuce rhisophere soil. A total of 702 bacterial isolates were isolated and tested for in vitro growth inhibition of R. solani. Seven strains appeared to have strong antagonistic effect against R. solani in in vitro growth inhibition assay. In the pot experiments, a strain BW-13 showed the most potent disease control effect on the both lettuce seedlings and adults plants. Therefore, the BW-13 was selected as a biocotrol candidate against crisphead lettuce bottom rot. Based on its morphology, physiological characteristics, and 165 rRNA gene analysis, the BW-13 was finally identified as Stenotrophomonas maltophilia. This study indicated that S. maltophilia BW-13 could be used as a biocontrol agent to control crisphead lettuce bottom rot.
Cultivation Conditions for Mass Production of an Antagonistic Bacterium Stenotrophomonas maltophilia BW-13
Park Jong-Young ; Kim Han-Woo ; Kim Hyun-Ju ; Chun Ok-Ju ; Jung Soon-Je ; Choi Woobong ; Lee Seon-Woo ; Moon Byung-Ju ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 158~161
DOI : 10.5423/RPD.2005.11.2.158
Stenotrophomonas maltophilia BW-13 is a potent biocontrol agent to control crisphead lettuce bottom rot caused by Rhizoctonia solani. To define the optimum conditions for the mass production of the S. maltophilia BW-13, we have investigated optimum culture conditions and effects of various carbon sources on the bacterial growth. The optimum initial pH and temperature were determined as pH
, respectively. For the selection of effective carbon source for the mass production, we tested the low molecular carbon sources such as sucrose, glucose, lactose, maltose, manose and the high molecular carbon source such as dough conditioner, rice bran, corn starch, sweet potato starch. As the results, the addition of dough conditioner in a basal medium (
) was able to achieve higher cell density and the antifungal activity than others. Therefore, the basal medium containing
dough conditioner (named as dough conditioner medium) was finally selected the optimized media for the mass production of BW-13 strain.
Disease Progress of Gray Blight on Tea Plant and Selection of a Biocontrol Agent from Phylloplanes of the Plant
Oh Soon-Ok ; Kim Gyoung Hee ; Lim Kwang-Mi ; Hur Jae-Seoun ; Koh Young Jin ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 162~166
DOI : 10.5423/RPD.2005.11.2.162
Disease progress of gray blight of tea (Camellia sinensis O. Kuntze) cv. Yabukita was investigated during the growing season of 2004 at Boseong Tea Experiment Station, Jeonnam Agriculture Research and Extension Service, Boseong, Jeonnam. The disease began to occur from late June and peaked in late July. Antagonistic bacteria against Pestalotiopsis longiseta, the causal pathogen of causing gray blight of tea plants were isolated from phylloplanes of tea plants. An isolate BD0310 which showed the strongest antifungal activity against the pathogen but nonpathogenic to tea plants was selected as a biocontrol agent for the gray blight. The isolate was identified as Bacillus subtilis based on its cultural, morphological, and biochemical characterization and 16S rDNA sequence analysis.
Environmental Factors Affecting Parasitism to Cucumber Powdery Mildew Fungus, Sphaerotheca fusca by Ampelomyces quisqualis 94013 and Its Host Range
Lee, Sang-Yeob ; Ryu, Jae-Dang ; Kim, Hong-Gi ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 167~172
DOI : 10.5423/RPD.2005.11.2.167
An isolate of Ampelomyces quisqualis 94013 was selected as an effective parasite for biological control against cucumber powdery mildew. Temperature range for the parasitism of A. quisqualis 94013 against cucumber powdery mildew was
, and optimal temperature for that
humidity of the greenhouse, parasitic ability of A. quisqualis 94013 against Sphaerotheca fusca was not good. Inoculation tests revealed that A. quisqualis 94013 can parasitize on six species of Sphaerotheca in the 12 crops and Ersiphe cichoracerum in tomato. As host rang of A. quisqualis 94013 was broad and it may be used effectively as a biocontrol agent for powdery mildew of 13 crops.
Cultural Characteristics of a Hyperparasite, Ampelomyces quissqualis 94013
Lee, Sang-Yeob ; Ryu, Jae-Dang ; Kim, Hong-Gi ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 173~178
DOI : 10.5423/RPD.2005.11.2.173
Ampelomyces quisqualis 94013 (AQ94013), a hyperparasite, was selected as an effective biological control agent against cucumber powdery mildew. Optimal temperature for mycelial growth of AQ94013 was
, and the optimal pH was 6.5. Conidia of AQ94013 were more Produced on potato dextrose agar (PDA) in darkness than under alternating cycles of 12 hr fluorescent light and 12 hr darkness. Temperature range for spore germination of the fungus was
, and optimal temperature was
. Conidial germination of the fungus began 8 hr after incubation at
. Germination rate of conidia at concentration of
was higher than at concentration of
. The best source of carbon and nitrogen for mycelial growth of the fungus were dextrin and neopeptone, respectively.
Effective Fungicides on Control of Stem and Root Rot of Paprika Caused by Nectria haematococca
Jee Hyeong-Jin ; Shim Chang-Ki ; Ryu Kyoung-Yul ; Nam Ki-Woong ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 179~184
DOI : 10.5423/RPD.2005.11.2.179
A previous study reported that the stem and root rot of paprika (Capsicum annum L. var, grossum) caused by Nectria haematococca became a threat to safe cultivation of the plant in the country. However, no strategies for control the disease have been suggested. In this study, fungicides registered for pepper were screened to evaluate their control effects on the disease. Among fungicides tested, prochloraz manganase complex com pletely suppressed mycelial growth of the pathogen at 10 ppm a.i. tebuconazole, benomyl, and carbendazim
kasugamycin also effectively inhibited mycelial growth of the fungus. However, kresoxim-methyl and triflox ystrobin did not suppress mycelial growth but significantly suppressed conidial germination of the fungus. Azoxystrobin, benomyl, prochloraz, tebuconazol, and carbendazim
kasugamycin were also effective to retard conidial germination. In vivo tests, tebuconazole strongly inhibited the plant growth even at 16,000x (15.6 ppm a.i.), while others did not induce chemical injury at 4,000x or 8,000x when drenched into a rockwool cube. In a greenhouse test, prochloraz manganase complex at 125 ppm a.i. (4,000x) showed highest control value by
. Other fungicides thiophanate-methylthiram, axozystrobin, trifloxystrobin, and benomyl presented
control value in the hydroponic cultivation system. However, application time and interval remained to be investigated for identify maximum residue limit.
Response of Colletotrichum sup. Causing Red Pepper Anthracnose to Protective and Ergosterol Biosynthesis-inhibiting Fungicides
Kim Joon Tae ; Lee Kyeong Hee ; Min Ji Young ; Kang Beum Kwan ; Rho Chang Woo ; Hong Seong Taek ; Kim Heung Tae ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 185~192
DOI : 10.5423/RPD.2005.11.2.185
In 1999 and 2002, 130 and 258 isolates of Colletotrichum spp. causing red pepper anthracnose were obtained from infected red pepper fruits, respectively. Their responses to 4 protective and 3 ergosterol biosynthesis-inhibiting(EBI) fungicides were investigated by observing their mycelial growth on PDA incorporated with different concentrations of each fungicide. The Colletotrichum isolates obtained in 1999 showed higher
values than those isolated in 2002 against three protective fungicides such as dithianon, chlorothalonil, and propineb, whereas the response was reversed toward other protective fungicide, iminoctadine. On the other hand, the isolates of year 1999 were more resistant against three EBI fungicides such as tebuconazole, hexaconazole, and prochloraz than those of year 2002; the
values of the former were 1.2-4.4 times higher than those of the latter, The responses of the Colletotrichum isolates toward protective and EBI fungicides were fluctuated according to regions, where the infected fruits were collected. On the other hand, the resis tance of Colletotrichum isolates to protective fungicides increased during monitoring from July to September, However, their responses towards EBI fungicides were not changed.
Control of Tomato Wilt Disease by Amending pH of Nutrient Solution in Hydroponic System
Lee Jung-Sup ; Choi Ji-Ho ; Seo Sang-Tae ; Han Kyoung-Suk ; Park Jong-Han ; Jang Han-Ik ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 193~197
DOI : 10.5423/RPD.2005.11.2.193
The effect of pH on the survival of R. solanacearum and its transmission via roots of tomato in hydroponic culture were studied in laboratory and greenhouse. In laboratory experiment, R. solanacearum could not survive for 24h in nutrient solution with pH of
, while 1, 14, 51 and
of inoculum survived at pH
, respectively. When tomato plants were inoculated with R. solanacearum through wounds on the stems, the bacteria moved downward from the inoculation site to the roots and infectious bacteria were released from the roots into the nutrient solution. Of two pH regimes tested in greenhouse nutrient-film technique(NFT) culture, the R. solanacearum population was significantly lower in pH 5.0 than in pH 6.5 in most sampling data. In treatments in which R. solanacearum was introduced by transplanting two root-inoculated plants, significantly move plants developed wilt at pH
(34 out of 48 plants) than at pH 5.0(11 out of 48 plants). In addition, when the bacterium was introduced by transplanting two stem-inoculated plants at pH
, seven out of 24 plants developed wilt.
Identification of Hanseniaspora(Kloeckera) sp. Related with White Dusty Symptom of the Grape
Lee, Yeryeong ; Kim, Geun-Gon ; Chung, Young-Ryun ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 198~200
DOI : 10.5423/RPD.2005.11.2.198
An epidemic of the white dusty covering of grape clusters and canes by dust-like particles occurred in many vineyards near Gimcheon, Gyeongbuk area since 2000. Although the covering was severe, it seldom resulted in appreciable damage to vine health except drastical reduction of grape quality. It appears that the abnormal growth of a resident yeast Hanseniaspora (Kloeckera) sp. is related to the white dusty covering on the grape surface.
Stem Rot of Hosta longipes Caused by Sclerotium rolfsii in Korea
Kwon Jin-Hyeuk ; Park Chang-Seuk ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 201~203
DOI : 10.5423/RPD.2005.11.2.201
The stem rot disease was found on Hosta longipes that planted in the flower beds along the Namgang riverside in Jinju city, Korea. The disease occurred first time in July, 2004 and sporadically occurred in 2005. The typical symptom of the disease is water-soaking, dark brown spot on the stem, and getting wilt. The infected plants were mostly died. White mycelial mats were spread over lesions and sclerotia were formed on stems and near soil line. The sclerotia were globoid in shape,
mm in diameter and white to brown in color, The optimum temperature for mycelial growth of the fungus on PDA was
and the hyphal width was
. Clamp connections were observed in the hyphae of the fungus grown on PDA. Pathogenicity of the causal organism was proved on Hosta longipes according to Koch,s postulate. On the basis of mycological characteristics and pathogenicity to host plants, the fungus was identified as Sclerotium rolfsii Saccardo. This is the first report on the stem rot of H. longipes caused by S. rolfsii in Korea.
Rhizopus Soft Rot on Momordica charantia Caused by. Rhizopus stolenifer in Korea
Kwon Jin-Hyeuk ; Jee Hyeong-Jin ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 204~207
DOI : 10.5423/RPD.2005.11.2.204
A Rhizopus soft rot caused by Rhizopus stolonifer occurred on Momordica charantia at Daesan-myon, Chang-won city, Gyeongnam province from 2003 to 2005. The disease usually started from wound on fruit with water-soaking lesions. The lesion rapidly expanded and softened. The fungal mycelia grew vigorously and sporangia, sporangiophores, and stolons were formed on surface of the fruit. Spoyangiophores were
in width. Sporangia were globose or hemispheric and
in size. The color of sporangia was white and cottony at first and turned to brownish black with many spores at maturity. Columella were hemispheric and
in size. Sporangiospores were irregular round or oval, brownish-black streaked and
in size. The optimum temperature for mycelial growth of the fungus on PDA was
. On the basis of mycological characteristics and pathogenicity to host plants, the causal fungus was identified as Rhizopus stolonifer (Ehrenberg ex. Fr,) Lind. This is the first report of Rhizopus soft rot on M. charantia caused by R. stolonifer in Korea.
Occurrence of Rhizina Root Rot in a Black Pine (Pinus thunbergii) Forest Located at the Western Coastal Area in Korea and Its Spreading Patterns
Lee, Seung-Kyu ; Kim, Kyung-Hee ; Kim, Yeon-Tae ; Park, Ju-Yong ; Lee, Sang-Hyun ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 208~212
DOI : 10.5423/RPD.2005.11.2.208
At the survey of June, 2002, total 294 dead frees were found in 20 ha of Black pine (Pinus thunbergii) forest located in the western coastal region of Korean peninsula. The dead trees were scattered over the 27 place as groups of about ten trees each. As a result of the field survey on the relationship between the conditions of dead trees and the occurrence of fruiting bodies of Rhizina undulata around the dead and/or dying trees, from June 2002 to August 2004 in the four plots, the occurrence of infected trees was observed as a shape of an irregular concentric circle from the first infected tree and R. undulata was found mainly around the dead tree. Because there was no observation of any other insects and pathogens which would kill trees, the cause of tree death in groups was considered owing to R. undulata. From the analysis of the physical and chemical proper ties of the soil collected from the damaged areas, the pH of soil was between 4.6 and 5.8 and the contents of soil nutrients were very low. Any "fire" trace was not found at all the 27 damaged places in the area, Taean, Chungcheongnam-Do, which are generally known as an important factor to initiate development of the disease. Therefore, further examination is needed to verify precisely about other environmental factors related with the group dying of the Black pines in this area beside `fire`.
Occurrence and Symptoms of Tomato Spotted Wilt Virus on Vegetables in Korea (I)
Cho Jeom-Deog ; Kim Jeong-Soo ; Kim Jin-Young ; Kim Jae-Hyun ; Lee Sin-Ho ; Choi Gug-Seoun ; Kim Hyun-Ran ; Chung Bong-Nam ;
Research in Plant Disease, volume 11, issue 2, 2005, Pages 213~216
DOI : 10.5423/RPD.2005.11.2.213
Tomato spotted wilt virus (TSWV) occurred abruptly with a high incidence rate in 14 vegetable crops in Anyang area, Gyunggido in 2004. TSWV was identified by the symptoms on the indicator plants, immunocaptured reverse transcription-polymerase chain reaction (IC/RT-PCR), virion captured (VC)RT-PCR and RT-PCR using total RNA from the infected plants. Vegetable crops infected with TSWV included table tomato, cherry tomato, red pepper, lettuce, chicory, red leaf chicory, red mustard, dragon tongue, treviso, potato, perilla, sesame, pumpkin, and ssamchoo (hybrid of oriental cabbage and cabbage). The incidence of TSWV in fields ranged from 30 to
. TSWV usually produced necrosis, wilt and/or severe mosaic with typical single or double ring spots on the leaves. TSWV could be detected in Frankliniella occidentalis collected from the crops in the fields with
rate by IC/RT-PCR.