Canadian Journal of Plant Pathology最新文献_第9页

First report of 16SrII-V phytoplasma associated with cowpea (Vigna unguiculata) phyllody in China 16SrII-V植原体与我国豇豆（Vigna unguiculata）叶序相关的首次报道

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-11-29 DOI: 10.1080/07060661.2022.2152490

Zhang Li, Li Zhanbiao, She Xiaoman, T. Farooq, Lian Zhenggang, Y. Lin, Lan Guobing, He Zifu, Yafei Tang

{"title":"First report of 16SrII-V phytoplasma associated with cowpea (Vigna unguiculata) phyllody in China","authors":"Zhang Li, Li Zhanbiao, She Xiaoman, T. Farooq, Lian Zhenggang, Y. Lin, Lan Guobing, He Zifu, Yafei Tang","doi":"10.1080/07060661.2022.2152490","DOIUrl":"https://doi.org/10.1080/07060661.2022.2152490","url":null,"abstract":"Abstract Cowpea plants exhibiting virescence, phyllody and little leaf symptoms were observed in the fields of Zhanjiang City, Guangdong province of China in October 2020. Total DNA was extracted from symptomatic cowpea leaves. Using phytoplasma universal primer pairs (R16mF2/R16mR1, P1/P7) and a secA primer pair (secAfor1/secArev3), expected PCR fragments of approximately 1400, 1800 and 800 bp were amplified from all symptomatic cowpea leaves. MUSCLE analysis revealed that the representative 16S rRNA gene sequence of cowpea phyllody phytoplasma (CPP) shared 98.67% nucleotide identity with the reference strain WBDL of ‘Ca. Phytoplasma aurantifolia’ (GenBank accession number U15442); and 100% nucleotide identity with 16SrII-V phytoplasmas associated with ‘Praxelis clematidea’ phyllody (GenBank accession number KY568717); ‘Desmodium triflorum’ little leaf (GenBank accession number MT452308); and ‘Ixeris chinensis’, ‘Emilia sonchifolia’, and ‘Desmodium ovalifolium’ witches’ broom (GenBank accession number MT416114, MT420682 and MK956144, respectively). Phylogenetic analyses based on the 16S rRNA and secA gene sequences revealed that the CPP strain clustered with the 16SrII-V subgroup and 16SrII group, respectively. Virtual restriction fragment length polymorphism analysis of the 16S rRNA sequence revealed that CPP was associated with the 16SrII-V subgroup. To our knowledge, this is the first report of the16SrII-V subgroup of phytoplasmas associated with cowpea phyllody disease.","PeriodicalId":9468,"journal":{"name":"Canadian Journal of Plant Pathology","volume":"45 1","pages":"103 - 109"},"PeriodicalIF":2.0,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46727218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Response of buckwheat to Pratylenchus brachyurus and Meloidogyne javanica 荞麦对短尾扇尾蝇和爪哇长尾蝇的响应

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-11-23 DOI: 10.1080/07060661.2022.2150318

Angelica Sanchez Melo, M. T. Silva, R. P. Schwengber, Guilherme Tarini, S. M. Santana‐Gomes, Elizeu Junior da Silva, C. R. Dias-Arieira

{"title":"Response of buckwheat to Pratylenchus brachyurus and Meloidogyne javanica","authors":"Angelica Sanchez Melo, M. T. Silva, R. P. Schwengber, Guilherme Tarini, S. M. Santana‐Gomes, Elizeu Junior da Silva, C. R. Dias-Arieira","doi":"10.1080/07060661.2022.2150318","DOIUrl":"https://doi.org/10.1080/07060661.2022.2150318","url":null,"abstract":"Abstract Antagonistic and non-host plants are some of the main strategies for nematode control, but the reaction of several plant species to these parasites remains to be investigated. This study aimed to evaluate the reaction of buckwheat to Pratylenchus brachyurus and Meloidogyne javanica and to assess the effect of buckwheat aqueous extract on P. brachyurus and M. javanica mortality and M. javanica hatching. Experiments were conducted under greenhouse and laboratory conditions. Treatments consisted of buckwheat ‘IPR-92 Altar’ and soybean ‘M6410 IPRO’ inoculated with different levels of P. brachyurus or M. javanica according to each experiment. Buckwheat was found to be a non-host to P. brachyurus. The RF of M. javanica on buckwheat ranged from 1.33 to 4.11, whereas the RF on soybean was 24.00. Buckwheat shoot extracts were effective in promoting nematode mortality and reducing M. javanica hatching. These findings indicate that buckwheat has potential as a cover crop for the control of P. brachyurus, but care is needed when introducing this plant to areas infested with M. javanica.","PeriodicalId":9468,"journal":{"name":"Canadian Journal of Plant Pathology","volume":"45 1","pages":"186 - 195"},"PeriodicalIF":2.0,"publicationDate":"2022-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41358626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diagrammatic scale for improved late leaf rust severity assessments in raspberry leaves 改进树莓叶片晚叶锈病严重程度评估的图解量表

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-11-17 DOI: 10.1080/07060661.2022.2147587

M. G. Dias, R. Ribeiro, Caio M. de A. Barbosa, J. D. de Jesus, M. B. Spósito

{"title":"Diagrammatic scale for improved late leaf rust severity assessments in raspberry leaves","authors":"M. G. Dias, R. Ribeiro, Caio M. de A. Barbosa, J. D. de Jesus, M. B. Spósito","doi":"10.1080/07060661.2022.2147587","DOIUrl":"https://doi.org/10.1080/07060661.2022.2147587","url":null,"abstract":"Abstract Late leaf rust (Thekopsora americana) is a disease that affects raspberry (Rubus idaeus L.), leading to a decrease in raspberry production. The adoption of precise criteria for disease quantification helps decision-making for its management. A diagrammatic scale (DS) is a useful tool for quantifying disease severity in the field. A DS was developed and validated in this study to estimate late leaf rust severity in raspberry leaves. The DS was defined with eight levels of severity (0.2, 0.4, 0.9, 2.2, 5.1, 11.5, 23.9 and 43.2%). The validation was performed by 15 untrained raters in two steps, with and without using the DS. Two approaches were used for statistical analysis: linear regression and Lin’s method. Both analyses demonstrated that the use of the DS improved the precision and accuracy of the disease estimates. The inter-rater reliability was estimated by the coefficient of determination (R2) and the intra-class correlation coefficient (ICC). Again, the use of the DS improved the reproducibility of the estimates. For the first time, a diagrammatic scale was developed and validated to evaluate late leaf rust severity in raspberry leaves.","PeriodicalId":9468,"journal":{"name":"Canadian Journal of Plant Pathology","volume":"45 1","pages":"140 - 147"},"PeriodicalIF":2.0,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42408281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Leaf spot of Kerria japonica caused by Diaporthe pescicola in China 日本双孢菌在中国引起的日本Kerria叶斑病

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-11-14 DOI: 10.1080/07060661.2022.2142671

HuLei Zhang, Chunxia Wang, Shenhai Wang, Shengfeng Mao

引用次数: 0

MCT1 plays crucial roles in conidiation, lactate metabolism and pathogenicity in Colletotrichum gloeosporioides MCT1在球孢炭疽菌的分生孢子、乳酸代谢和致病性中起着至关重要的作用

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-11-14 DOI: 10.1080/07060661.2022.2147586

Xuanzhu Zhao, Na Wang, Z. Ji, Zong-shan Zhou, Junxiang Zhang

引用次数: 0

Rhizospheric bacteria for use in preventing Fusarium wilt and crown root rot of tomato under natural field conditions 自然田间条件下根际细菌防治番茄枯萎病和根腐病的研究

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-11-02 DOI: 10.1080/07060661.2022.2087104

M. Khalil, R. Félix-Gastélum, O. Peñuelas-Rubio, Leandris Argentel-Martínez, I. Maldonado-Mendoza

{"title":"Rhizospheric bacteria for use in preventing Fusarium wilt and crown root rot of tomato under natural field conditions","authors":"M. Khalil, R. Félix-Gastélum, O. Peñuelas-Rubio, Leandris Argentel-Martínez, I. Maldonado-Mendoza","doi":"10.1080/07060661.2022.2087104","DOIUrl":"https://doi.org/10.1080/07060661.2022.2087104","url":null,"abstract":"Abstract Biocontrol, an alternative to chemical control against plant pathogens, may also improve plant health and enhance fruit yield. Tomato production in open fields or greenhouses is constrained by the pathogens Fusarium oxysporum f. sp. lycopersici race 3 (Fol R3) and F. oxysporum f. sp. radicis-lycopersici (Forl). In this work, we studied the biocontrol effect of the antagonistic bacteria Acinetobacter calcoaceticus AcDB3, Bacillus thuringiensis BtMB9, B. subtilis BsTA16, and B. amyloliquefaciens BaMA26 in field trials with four tomato hybrids over two consecutive growing seasons (2019–2020 and 2020–2021). The effect of these bacteria on plant growth was also evaluated. The presence of F. oxysporum in field soil and/or infected plants was confirmed microbiologically. All four bacterial strains significantly suppressed the severity of Fusarium crown and root rot of tomato (FCRRT) and Fusarium wilt symptoms, as well as increased tomato yield under field conditions. Among the four strains, B. subtilis BsTA16 showed the highest reduction in symptoms of Fusarium wilt (68%) and FCRRT (74%). To the best of our knowledge, this is the first report of biological control agents (BCAs) exerting antagonistic activity against both FCRRT caused by Forl and Fusarium wilt caused by Fol in tomato under field conditions.","PeriodicalId":9468,"journal":{"name":"Canadian Journal of Plant Pathology","volume":"44 1","pages":"836 - 848"},"PeriodicalIF":2.0,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41959585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First report of root rot on onion (Allium cepa) seedlings caused by Globisporangium irregulare in South Korea 韩国洋葱（Allium cepa）幼苗根腐病的首次报告

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-10-31 DOI: 10.1080/07060661.2022.2142299

O. Choi, B. Kang, Yeyeong Lee, J. Kwon, Jinwoo Kim

引用次数: 2

Weed hosts and winter survival of Stemphylium vesicarium on onion in Ontario, Canada 加拿大安大略洋葱上鳞茎茎的杂草寄主及冬季存活

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-10-07 DOI: 10.1080/07060661.2022.2130433

M. R. Mcdonald, S. Stricker, B. Gossen

{"title":"Weed hosts and winter survival of Stemphylium vesicarium on onion in Ontario, Canada","authors":"M. R. Mcdonald, S. Stricker, B. Gossen","doi":"10.1080/07060661.2022.2130433","DOIUrl":"https://doi.org/10.1080/07060661.2022.2130433","url":null,"abstract":"Abstract Stemphylium leaf blight (SLB), caused by the fungal pathogen Stemphylium vesicarium, is an important disease of onion (Allium cepa). This pathogen also causes disease on a wide range of other plant species. SLB on onion is managed primarily through fungicide application. The source of primary inoculum and whether S. vesicarium can overwinter in the region were not known. Inoculation and subsequent re-isolation of the pathogen from common weed species present near onion fields demonstrated that many of these weedy species are hosts of S. vesicarium. Redroot pigweed (Amaranthus retroflexus), yellow nutsedge (Cyperus esculentus), yellow marshcress (Rorippa palustris), perennial sow thistle (Sonchus arvensis) and purslane (Portulaca oleracea) were identified as new hosts of S. vesicarium and bull thistle (Cirsium vulgare) was confirmed as a host. Sporulation on dead weed residue in spring may be a source of primary inoculum for infection of adjacent onion fields. Also, a study of pathogen survival in infected leaf pieces of onion buried in soil or left at the soil surface demonstrated that S. vesicarium can overwinter in infected onion leaf residue and produce pseudothecia and ascospores in early spring. These conclusions support existing management recommendations for the burial or removal of onion debris and managing weeds in and around onion fields.","PeriodicalId":9468,"journal":{"name":"Canadian Journal of Plant Pathology","volume":"45 1","pages":"134 - 139"},"PeriodicalIF":2.0,"publicationDate":"2022-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45344634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

First report of Erysiphe verniciferae causing powdery mildew on smoke tree (Cotinus coggygria) from Pakistan 白丹毒引起巴基斯坦黄檗白粉菌的初报

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-09-07 DOI: 10.1080/07060661.2022.2122081

Saliha Afzal, N. Afshan, A. Khalid

引用次数: 0

Development of optimized Verticillium longisporum inoculation techniques for canola (Brassica napus) 油菜籽长孢黄萎病菌接种技术优化研究

IF 2 4区农林科学

Canadian Journal of Plant Pathology Pub Date : 2022-09-07 DOI: 10.1080/07060661.2022.2120913

J. Cui, S. Strelkov, R. Fredua-Agyeman, S. Hwang

{"title":"Development of optimized Verticillium longisporum inoculation techniques for canola (Brassica napus)","authors":"J. Cui, S. Strelkov, R. Fredua-Agyeman, S. Hwang","doi":"10.1080/07060661.2022.2120913","DOIUrl":"https://doi.org/10.1080/07060661.2022.2120913","url":null,"abstract":"Abstract Verticillium stripe, caused by Verticillium longisporum, is an emerging soilborne disease of canola (Brassica napus) in Canada. Improved inoculation protocols will facilitate study of Verticillium stripe and its management. Two inoculation techniques, a root-dip method at two inoculum concentrations and a grain inoculation method at four inoculum concentrations, were compared under greenhouse conditions with the canola cultivars ‘45H31’, ‘CS2000’ and ‘Westar’. Symptoms of Verticillium stripe appeared at early growth stages following root dip inoculation, resulting in seedling mortalities of up to 19.7%, 39.5% and 33.3% for ‘CS2000’, ‘45H31’ and ‘Westar’, respectively, at 35 days post-inoculation. Plants inoculated by the root-dip method incurred much greater mortality at the high versus low inoculum concentration. In the surviving adult plants, ‘45H31’ was moderately resistant while ‘CS2000’ was more susceptible to V. longisporum. The grain inoculation method did not cause early-stage mortality, although Verticillium stripe severity at the adult stage was significantly different between control and high inoculum concentrations for all cultivars. In addition, plant dry weight and height decreased as inoculum concentration increased. Inoculation of 1-week-old, 2-week-old and 3-week-old seedlings of ‘CS2000’ and ‘Westar’ was also compared by the root-dip method. The impact of host age at inoculation on disease development was not significant, although higher disease severity was observed at later inoculation in ‘CS2000’. The application of grain inoculum may be more suitable for large-scale screening or studies conducted under field conditions.","PeriodicalId":9468,"journal":{"name":"Canadian Journal of Plant Pathology","volume":"45 1","pages":"92 - 102"},"PeriodicalIF":2.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42097405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1