Australasian Plant Pathology最新文献

{"title":"Detection of seed association and transmission of Pseudoperonospora cubensis in Cucumis sativus in Punjab, India","authors":"Kritika Sardool,&nbsp;Ritu Rani,&nbsp;Sandeep Jain","doi":"10.1007/s13313-026-01188-w","DOIUrl":"10.1007/s13313-026-01188-w","url":null,"abstract":"<div><p>Downy mildew, caused by an obligate biotrophic oomycete, <i>Pseudoperonospora cubensis</i>, is one of the most devastating foliar diseases of cucumber. Although the pathogen is primarily regarded as soil-borne, its seed-borne nature and potential for seed transmission have not been thoroughly studied. In the present study, fruits were collected from naturally infected vines across various districts of Punjab and evaluated for the presence and transmissibility of <i>P. cubensis</i>. Microscopic studies confirmed the presence of sporangia as well as oospores in exocarp, mesocarp and seed cavity of cucumber fruits. The highest seedling transmission rates (up to 26.67%) were recorded from Sangrur and Ludhiana districts. Artificial inoculation of healthy fruits and seeds with sporangial and oospore suspensions further revealed colonisation of seed coats and embryos. Seed grow-out assays demonstrated seed-to-seedling transmission ranging from 26.67% to 46.66% in artificially inoculated seeds and up to 46.66% in artificially inoculated fruits. Cross-pathogenicity assays also confirmed the infectivity of both infected pulp and seeds on healthy seedlings and detached leaves. PCR assays using ITS-4 and ITS-5 primers amplified an 800 bp band of <i>P. cubensis</i> from artificially inoculated seeds and fruits. The combined morphological, pathological and molecular assays indicate that <i>P. cubensis</i> is seed-borne and transmitted under controlled conditions. Consequently, it underscores the importance of considering the potential for pathogen transmission through cucumber seeds and fruits, offering a strategy to limit the spread of cucumber downy mildew.</p></div>","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927356","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}

{"title":"First report of Phytophthora tentaculata causing dieback on marguerite daisy (Argyranthemum frutescens) and bacopa (Chaenostoma cordatum) plants in Aotearoa New Zealand","authors":"Merje Toome,&nbsp;Katharina Hofer,&nbsp;Lewis Braithwaite,&nbsp;Natalie Pettitt,&nbsp;Alice Merrall,&nbsp;Wellcome Ho","doi":"10.1007/s13313-026-01183-1","DOIUrl":"10.1007/s13313-026-01183-1","url":null,"abstract":"","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927003","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}

{"title":"First report of turnip yellows virus from Botswana","authors":"Adane Abraham,&nbsp;Emmanuel K. Sekopo,&nbsp;Wulf Menzel","doi":"10.1007/s13313-026-01189-9","DOIUrl":"10.1007/s13313-026-01189-9","url":null,"abstract":"","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926769","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}

{"title":"Seed bio-priming with multifaceted PGPR from underutilized medicinal plants enhances disease resistance and improves yield in rice","authors":"S. Raghu,&nbsp;B. Jeevan,&nbsp;Devayani Sarmah,&nbsp;Mathew Baite,&nbsp;C. Anilkumar,&nbsp;Rupak Jena,&nbsp;M. K. Bag,&nbsp;B. S. Satapathy,&nbsp;S. D. Mohapatra","doi":"10.1007/s13313-026-01186-y","DOIUrl":"10.1007/s13313-026-01186-y","url":null,"abstract":"<div><p>Rice bakanae disease, caused by <i>Fusarium</i> species, has recently emerged as an important threat to non-Basmati rice production in Eastern and North-Eastern India. Due to the limited availability of efficient fungicides and the rise of fungicidal resistance, sustainable alternatives are urgently needed. In the present study, we aimed to identify and characterize effective Plant Growth-Promoting Rhizobacteria (PGPR) from the rhizosphere of medicinal plants to manage bakanae disease and enhance rice productivity. A total of 158 rhizobacterial strains were isolated and screened for in vitro antagonism against four <i>Fusarium</i> species (<i>F. fujikuroi, F. verticillioides, F. proliferatum,</i> and <i>F. sacchari</i>). Ten promising isolates were identified and evaluated for extracellular enzyme production and plant growth-promoting (PGP) traits. The strains were tested through seed bio-priming in two rice cultivars, Pooja (Highly Susceptible) and Chandan (Moderately resistant), under glasshouse conditions. Molecular characterization via 16S rRNA sequencing identified the elite strains as <i>Bacillus, Priestia</i> and <i>Paenibacillus</i> species. Among these, <i>Priestia megaterium</i> (CRM-37) exhibited the highest mycelial inhibition (up to 89.00%) and significantly reduced disease incidence (down to 9.83%) compared to inoculated controls. Bio-priming with CRM-37 significantly improved germination (98.67 &amp; 99.67%), vigor index-I (3527.50 &amp; 3221.83), and grain yield (85.67 &amp; 80.67 g/pot) in Pooja and Chandan respectively. These improvements were associated with a significant increase in chlorophyll content and the up regulation of defense-related enzymes, including peroxidase (POD), polyphenol oxidase (PPO), phenylalanine ammonia-lyase (PAL), and superoxide dismutase (SOD), indicating the induced systemic resistance (ISR) activities of the strains. Our findings demonstrate that <i>P. megaterium</i> (CRM-37) is a potent biocontrol agent and bio-stimulant. It offers a multifaceted approach, combining direct antagonism with induced systemic resistance, making it an ideal candidate for sustainable management of bakanae disease in non-basmati rice varieties.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926305","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}

{"title":"Vegetative compatibility groups of pathogenic Fusarium oxysporum isolates from garlic and their correlation to forma specialis in Türkiye","authors":"Nedaa M. M. Tanina,&nbsp;Olcay Dedecan,&nbsp;Canan Can,&nbsp;Kamil Sarpkaya,&nbsp;Feyza Nur Kafadar","doi":"10.1007/s13313-026-01187-x","DOIUrl":"10.1007/s13313-026-01187-x","url":null,"abstract":"<div><p><i>Fusarium oxysporum</i> is one of the most important soil-borne pathogens affecting garlic production worldwide because of its wide host range and significant economic impact. This study aimed to characterize the population structure of garlic-associated <i>Fusarium oxysporum</i> isolates collected from major garlic-producing regions of Türkiye using pathogenicity, vegetative compatibility, β-tubulin-based phylogenetic analysis, and haplotype diversity. Thirty isolates obtained from garlic basal plates were evaluated morphologically and molecularly. Phylogenetic analysis based on the β-tubulin gene confirmed that all isolates belonged to the <i>Fusarium oxysporum</i> species complex (FOSC). Vegetative compatibility analysis classified the isolates into two vegetative compatibility groups (VCGs), with each isolate assigned to a single VCG. Cross-pathogenicity assays on garlic, onion, and leek revealed considerable variation in virulence among isolates, indicating differences in host adaptation within the population. Haplotype analysis identified four haplotypes with a haplotype diversity (Hd) of 0.4064, indicating moderate genetic diversity. The predominance of a single haplotype together with the occurrence of multiple haplotypes within the two VCGs suggests that vegetative compatibility and β-tubulin haplotypes represent complementary aspects of population structure rather than directly corresponding classifications. Overall, the results demonstrate that garlic-associated FOSC populations in Türkiye exhibit limited genetic differentiation despite considerable phenotypic variation in pathogenicity. This study provides new insights into the population biology of garlic-associated FOSC and establishes a basis for future epidemiological, phylogenetic, and disease management studies.</p></div>","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927905","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}

{"title":"Seasonal dynamics of coffee leaf rust in highland areas in the Brazilian Northeast and its management using fungicides and resistant genotypes","authors":"Janisson Bispo Lino,&nbsp;Rejane do Livramento Freitas-Lopes,&nbsp;Alexandre Sandri Capucho,&nbsp;Ueder Pedro Lopes","doi":"10.1007/s13313-026-01156-4","DOIUrl":"10.1007/s13313-026-01156-4","url":null,"abstract":"<div><p>In the state of Pernambuco, Brazil, coffee has been grown in highland areas, whose climatic conditions differ from other typically producing regions. Despite the large number of small coffee producers and the production potential, there is no information on coffee leaf rust (CLR) epidemic and its management in this region. Thus, this study established the CLR progress curve in highland areas of Brazilian Northeast, and to evaluated some strategies to control the disease, including the use of fungicides and coffee resistant genotypes. In this study, the CLR epidemic showed a temporal progress that differed from the typical production regions in Brazil, starting between April and May, and achieving the maximum intensity between August and September. This progress coincided with the rainy period in the region. The effectiveness of the fungicides to control the disease was variable, and the most effective control was obtained with the application of flutriafol via soil in April, at the beginning of the rainy season. Some coffee genotypes (Tupi IAC 1669-20, Obatã IAC 1669-20, and Katipó) showed resistance to CLR, and should be preferentially cultivated in the highland areas. Our results provide valuable information on CLR in highland areas in Brazilian Northeast. This information will help coffee growers to establish disease management strategies, aiming at an effective control and, consequently, an increased yield in the region.</p></div>","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13313-026-01156-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification, characterization and biogenic fungicide screening of Macrophomina phaseolina (Tassi) Goid. causing root rot in Atractylodes lancea (Thunb.) DC.","authors":"Haonan Shen,&nbsp;Ruixin Ju,&nbsp;Ang Li,&nbsp;Min Tang,&nbsp;Xiaomeng Fei,&nbsp;Yueyu Ye,&nbsp;Lixia Wang,&nbsp;Fang Tian,&nbsp;Wei Gu","doi":"10.1007/s13313-026-01181-3","DOIUrl":"10.1007/s13313-026-01181-3","url":null,"abstract":"<div><p>Root rot is the most prevalent root disease affecting <i>Atractylodes lancea</i> (Thunb.) DC. (<i>A. lancea</i>) and poses the primary obstacle to the development of its cultivation industry. In this study, we isolated and purified the pathogen from the junction between infected and healthy tissues of diseased roots and rhizomes. Pathogenicity was confirmed, and the pathogen was identified as <i>Macrophomina phaseolina</i> through morphological and molecular characterization. The biological characteristics of <i>M. phaseolina</i> were subsequently analyzed. Using this identified pathogen as the reference strain, we screened various biogenic fungicides in laboratory assays and evaluated their efficacy in field trials. Additionally, their effects on the growth and physiological–biochemical parameters of <i>A. lancea</i> were assessed. The optimal growth conditions for <i>M. phaseolina</i> were determined to be PDA medium, a 12 h light/12 h dark photoperiod, temperatures between 25 and 35 °C, and a pH range of 4 to 5. Laboratory and field experiments identified three biogenic fungicides with the highest efficacy: 3% zhongshengmycin, 0.5% berberine, and 8% ningnanmycin. None of these treatments exhibited phytotoxicity or adversely affected plant growth. Importantly, they significantly reduced malondialdehyde (MDA) content while enhancing the activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD). The screening of commercial biogenic fungicides provides new strategies for prevention and control of root rot in <i>A. lancea</i> in practical production, positioning them as a potential substitute for conventional chemical fungicides.</p></div>","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838045","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}

{"title":"First report of tomato yellow leaf curl virus in Bora Bora Island, French Polynesia","authors":"Myriam Boëx,&nbsp;Pierre Lefeuvre,&nbsp;Raufea Reid,&nbsp;Mihuraatua Hokuin,&nbsp;Laura Hartmann,&nbsp;Maurice Wong,&nbsp;Jean-Michel Lett","doi":"10.1007/s13313-026-01185-z","DOIUrl":"10.1007/s13313-026-01185-z","url":null,"abstract":"","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837918","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}

{"title":"First report of Neopestalotiopsis rosae causing leaf spot of blueberry in Mexico","authors":"Perla R. Nuñez-Garcia,&nbsp;Kamila C. Correia,&nbsp;Sami J. Michereff,&nbsp;Elizabeth García-León,&nbsp;Alma Rosa Solano-Báez,&nbsp;Juan Manuel Tovar-Pedraza","doi":"10.1007/s13313-026-01184-0","DOIUrl":"10.1007/s13313-026-01184-0","url":null,"abstract":"","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782798","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}

{"title":"First report of Podosphaera xanthii causing powdery mildew on Vigna khandalensis in India","authors":"M. M. Bodhe,&nbsp;A. S. Patil,&nbsp;A. S. Kadam,&nbsp;D. D. Namdas,&nbsp;J. J. Chavan","doi":"10.1007/s13313-026-01182-2","DOIUrl":"10.1007/s13313-026-01182-2","url":null,"abstract":"","PeriodicalId":8598,"journal":{"name":"Australasian Plant Pathology","volume":"55 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752409","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}