First Report on the Emergence of <i>Neopestalotiopsis rosae</i> as a Severe Economic Threat to Strawberry Production in Germany by Tom E. Schierling, Ralf T. Voegele, Abbas El-Hasan

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Identification and Koch Postsulate Test of Fungal Causative Disease in Gouramy Fish by Sri Nuryati, F.B.P. Sari, . Taukhid

“…Saprolegnia was identified in infected egg whereas Aphanomyces sp. was identified in the internal part (underneath lesion) of gouramy fish. Postulate Koch tests was further confirmed that both species could infect gouramy fish.     …”
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THE FIRST REPORT OF PESTALOTIOPSIS SP. CAUSING CROWN ROT DISEASE ON STRAWBERRIES IN DALAT by Lê Dũng, Nguyễn Thị Diên, Phan Hoàng Đại, Phạm Ngọc Tuân

“…Most fungi isolated from infected parts were identified as Botrytis cinerea, Verticillium sp., Cylindrocarpon destructans, Fusarium oxysporum, Rhizoctonia sp. and Pestalotiopsis sp., in which the main fungi consistently isolated were Pestalotiopsis sp.. By fulfilling Koch’s postulates, the results of pathogenesis test indicated that Pestalotiopsis sp. was a pathogen causing the crown rot disease on strawberries in Dalat. …”
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Characterization of pathogenic bacteria in eel Anguilla bicolor bicolor by Dinamella Wahjuningrum, Acep Muhamad Hidayat, Tatag Budiardi

“…The results showed three dominant species of bacteria suspected as a causative agent in eel, namely: Aeromonas hydrophila, Streptococcus agalactiae, and Listeria grayi. Koch’s postulates test proved that the Aeromonas hydrophila and Streptococcus agalactiae were virulent to Anguilla bicolor bicolor.  …”
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Identification and management of a novel Danshen leaf anthracnose caused by Colletotrichum karstii in Salvia miltiorrhiza Bunge in China by Haoyue Ma, Haoyue Ma, Liguo Huang, Lulu Guo, Lulu Guo, Shan Chen, Jiale Liu, Changyun Liu, Yanxia Dou, Xianchao Sun, Lin He, Guanhua Ma

“…Combining molecular biology techniques with morphological observation and Koch’s postulates, the pathogen was conclusively identified as Colletotrichum karstii. …”
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Extradigestive Manifestation of Helicobacter Pylori Infection in Children and Adolescents by Philip M Sherman, Frank YH Lin

“…Helicobacter pylori infection fulfills each of Koch's postulates as a human pathogen causing chronic active gastritis. …”
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Antigenic Complementarity in the Origins of Autoimmunity: A General Theory Illustrated With a Case Study of Idiopathic Thrombocytopenia Purpura by Robert Root-Bernstein, Jacob Couturier

“…Finally, we argue that Koch's postulates are inadequate for establishing disease causation for multiple-antigen diseases and discuss the possibility that current research has failed to elucidate the causes of human autoimmune diseases because we are using the wrong criteria.…”
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First report of wilt disease in cashew (Anacardium occidentale L.) caused by Fusarium decemcellulare in Kerala, India by A. V. Meera Manjusha, P. K. Laya, Amal Premachandran, M. Veena

“…Pathogenicity of the isolate was confirmed in cashew seedlings, thereby demonstrating Koch’s postulates. Conclusion To our knowledge, this is the first record of wilt disease of cashew caused by F. decemcellulare in India. …”
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Diversity of Rust Fungi with Special Emphasis on <i>Hyalopsora erlangensis</i> Causing Disease in <i>Cystopteris chinensis</i> by An Yu, Xia Zhao, Xiaohong Chen

“…Artificial inoculation experiments, which involved sampling uredia from the field, were conducted to fulfill Koch’s postulates. Our results designate this rust fungus as a novel species within the Pucciniastraceae family, named <i>Hyalopsora erlangensis</i> A. …”
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Morphological and biochemical identification of Ralstonia solanacearum strains in ginger (Zingiber officinale Roscoe) wilt disease by Kezia Natalia, Andree Wijaya Setiawan, Ruth Meike Jayanti

“…The study involved purposive sampling, isolation, and purification of isolates, followed by morphological characterization through observation and biochemical characterization using Gram staining with KOH, oxidase test, arginine activity test, hypersensitivity test, bacterial density calculation, Koch's postulates, and biovar characterization. Three isolates from Banyubiru displayed typical morphological characteristics of RSSC, including round, mucoid colonies with red centers and white edges on TZC medium, and rod-shaped bacterial cells. …”
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Occurrence of Spot Blotch in Spring Barley Caused by Bipolaris sorokiniana Shoem. in South-Eastern Kazakhstan by Yerlan Dutbayev, Nurlan Kuldybayev, Saule Daugaliyeva, Elvira Ismailova, Nadira Sultanova, Göksel Özer, Ayana Slyamova, Kadyrzhan Mukin, Abdelfattah Dababat, Minura Yessimbekova

“…Inoculated seedlings showed clear symptoms of B. sorokiniana, and therefore, Koch’s postulates were fulfilled by reisolating the pathogen from artificially inoculated seedlings and identifying it based on standard morphology criteria. …”
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<i>Trachemys scripta</i> Eggs as Part of a Potential In Vivo Model for Studying Sea Turtle Egg Fusariosis by María Martínez-Ríos, Laura Martín-Torrijos, Javier Diéguez-Uribeondo

“…We found that the pathogen could colonize and develop similar signs to those observed in nature and fulfill Koch’s postulates. The pathogen showed high virulence properties (e.g., high disease incidence, severity, and low hatching success) and its ability to modify the pH in both the egg surface and culture media, confirming previously described fungal pathogen models. …”
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Polydomus karssenii gen. nov. sp. nov. is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes (Heterodera spp.) by Samad Ashrafi, Jan-Peer Wennrich, Yvonne Becker, Jose G. Maciá-Vicente, Anke Brißke-Rode, Matthias Daub, Torsten Thünen, Abdelfattah A. Dababat, Maria R. Finckh, Marc Stadler, Wolfgang Maier

“…The pathogenicity tests against nematode eggs fulfilled Koch’s postulates using in vitro nematode bioassays and showed that the fungus could parasitise its original nematode host H. filipjevi as well as the sugar beet cyst nematode H. schachtii, and colonise cysts and eggs of its hosts by forming highly melanised moniliform hyphae. …”
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Cercosporoid leaf pathogens from whorled milkweed and spineless safflower in California by S.T. Koike, A. Baameur, J.Z. Groenewald, P.W. Crous

“…Pathogenicity is also established for both pathogens based on Koch's postulate.…”
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Tomato rot by Rhizopus microsporus alters native fungal community composition and secondary metabolite production by Mmanoko Napo, Alicia Kock, Kazeem A. Alayande, Michael Sulyok, Michael Sulyok, Chibundu N. Ezekiel, Jessie Uehling, Teresa E. Pawlowska, Rasheed A. Adeleke

“…We assessed the impact of the symbiotic R. microsporus harboring its endosymbiont as well as the fungus cured of it on: (1) the magnitude of spoilage in tomato fruits, as evaluated by Koch's postulate for pathogenicity, (2) the shifts in native communities of endophytic fungi inhabiting these fruits, as examined by ITS rRNA gene metabarcoding and (3) secondary metabolites generated by these communities, as analyzed using multi-analyte LC-MS/MS. …”
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