First report of Neophloeospora maculans causing leaf spots in Morus nigra and M. alba in Brazil

Journal of Plant Diseases and Protection - Mulberry (Morus spp.), represents a set of plants grown in Brazil for production of fruits, leaves for feeding silkworms and ruminant animals, and for...     

First report of Colletotrichum queenslandicum causing leaf anthracnose on Dracaena cambodiana in China

In June 2021, a leaf spot was found on Dracaena cambodiana on Yongxing island of Sansha City, Hainan Province, China. The disease mainly occurred at the tips or edges of older leaves. About 50% of leaves were showed necrotic symptoms. Similar fungal isolates were obtained from all sterilized sections incubated on PDA. The fungus was identified as Colletotrichum queenslandicum by morphological characteristics and multi-locus phylogenetic analyses with ITS region of rDNA, GADPH, CHS-1, ACT, GS and TUB-2 gene sequences. This is the first report of Colletotrichum queenslandicum causing leaf anthracnose on Dracaena cambodiana.

     

First report of Aplosporella javeedii causing branch blight disease of Mulberry (Morus alba) in China

Journal of Plant Diseases and Protection - Mulberry has tremendous economic importance and cultivated widely across China. In June 2018, branch blight disease was found on mulberry (Morus alba) in...     

First report of leaf spots on Gentiana rhodantha caused by Pestalotiopsis trachicarpicola

Journal of General Plant Pathology - In August 2018, leaf spots with circular or irregular brown lesions on Gentiana rhodantha leaves were widespread in Liupanshui, Guizhou Province, China. Three...     

First report of Neofusicoccum parvum causing stem and branch canker on Cannabis sativa in Italy

Journal of Plant Diseases and Protection - In 2016, symptoms of stem canker with branches dieback were detected in several Cannabis sativa L. crops, located in the northeast part of Italy (Rovigo...     

First report of Fusarium proliferatum causing root rot of Gerbera in China

Journal of Plant Diseases and Protection - In January 2018, gerbera plants showed root rot symptoms were found in a greenhouse at Guizhou Horticultural Institute in Guiyang city, Guizhou Province...     

First report of Alternaria dianthicola causing flower blight on carnation in China

A severe disease of carnation flowers was observed in Kunming, China in November 2009. Initial symptoms on flowers and immature flower buds were characterized by water‐soaked areas. Spots with purple margins could be seen on petals of some varieties. An Alternaria sp. was isolated from 100% of symptomatic tissues sampled. The isolates showed high virulence when inoculated onto tissue culture plantlets and on healthy carnation flowers. Results of sequence analysis of 5.8S rDNA‐ITS of isolates showed 99% sequence similarity with Alternaria dianthicola in GenBank. To the best of the authors' knowledge, this was the first sighting of blight of flowers and immature flower buds of carnation caused by Alternaria dianthicola in China.     

First report of Pseudomonas aeruginosa causing tumor disease of Populus koreana in China

Journal of Plant Diseases and Protection - In May 2018, a bacterial tumor disease was observed on Populus koreana in Shuangyang county, Changchun city, Jilin Province. Based on physiological...     

First report of Pseudomonas oryzihabitans causing fruit black rot in prickly ash in China

Journal of Plant Diseases and Protection - Since the summer of 2017, bacterial fruit black rot disease was observed on prickly ash (Zanthoxylum armatum DC., Yongqing No. 1) in three counties...     

Genomic variability and plasticity of Pseudomonas causing coffee leaf spots in Minas Gerais state,Brazil

Foliar spots caused by Pseudomonas coronafaciens pv. garcae (Pcg), Pseudomonas amygdali pv. tabaci (Pat) and Pseudomonas cichorii (Pch) are major bacterial diseases that can reduce coffee production. However, little is known about the genetic diversity and molecular mechanisms underlying the pathogenicity to coffee plants of these bacteria. In this study, genome sequences of Pcg, Pat and Pch strains isolated from coffee plants in Minas Gerais state, Brazil, were used to assess their variability and plasticity, and compare their type III secretion system (T3SS) and apoplastic effector repertoires as well as tabtoxin biosynthetic/detoxification genes. Genomic diversity was found for all three phytopathogens, among which Pch possesses the highest number of exclusive proteins. The Pcg genome is the most stable whereas that of Pch is the most plastic, which is related to their host ranges. When compared with those of Pseudomonas syringae pv. tomato DC3000, hrp/hrc gene sequences are more conserved in Pcg and Pat than in Pch, which also possesses the smallest T3SS and the largest apoplastic effector repertoires. The only T3SS effector family common to all three pathogens is AvrE, suggesting that, as for other plant–Pseudomonas interactions, it may play a crucial role for pathogenicity towards coffee plants. Apoplastic proteins associated with maintaining the redox balance and degrading proteins/peptides not previously described as important in plant–bacteria interactions were found. Gain/loss of the tabtoxin biosynthetic cluster with retention of the antitoxin gene was observed, indicating that tabtoxin production is not a limiting factor for the occurrence of mixed infections.     

Isolation and pathogenic variability of Colletotrichum falcatum causing red rot in sugarcane

Journal of Plant Diseases and Protection - Red rot of sugarcane caused by the fungus Colletotrichum falcatum Went is the most destructive and severe disease worldwide. The present study identifies...