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Plant Disease

@plantdiseasej.bsky.social

The leading international journal for rapid reporting of research on new, emerging, and established plant diseases. Published by The American Phytopathological Society.

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Plant Disease @plantdiseasej.bsky.social · 7d ago

“Genetic Dissection of Adult-Plant Resistance to Stripe Rust in the Winter Wheat Line Tianmin 668,” by Jinghuang Hu et al. Learn more: https://doi.org/10.1094/PDIS-11-25-2275-RE

Fig. 1. Frequency distribution and correlation analysis of stripe rust maximum disease severity in recombinant inbred lines from the cross Tianmin 668 × Jingshuang 16 across three years and BLUP datasets. Field phenotyping was conducted in the field plots at Qingshui, Gansu Province, in the growing seasons 2019 to 2020 (Q2020), 2020 to 2021 (Q2021), and 2021 to 2022 (Q2022). **, P < 0.01.

Plant Disease @plantdiseasej.bsky.social · 7d ago

Shirley Marcou et al. present the most comprehensive survey to date of #Rhizoctonia solani and related fungi across major field crops in Sweden, focusing on the southern agricultural region Scania: https://doi.org/10.1094/PDIS-08-25-1754-RE

Fig. 2. Distribution of Rhizoctonia and related fungal isolates among the five major crop groups in Sweden (Fabaceae, primarily pea; carrot; sugar beet; potato; and Brassicaceae) and the anastomosis group (AG) composition within the three most represented crops. The central pie chart shows the relative number of isolates collected from each crop group, with Fabaceae (primarily pea), carrot, and sugar beet being the most dominant. Surrounding pie charts depict the AG distribution (expressed as percentages) within pea, carrot, and sugar beet.

Plant Disease @plantdiseasej.bsky.social · last wk.

A previously undocumented and economically significant fruit rot disease has emerged on apple during cold storage in China. Xiaofei Liang et al. identified #Neocyphella psychrotropha sp. nov. as the causal agent—representing a new family in Agaricales: https://doi.org/10.1094/PDIS-08-25-1642-RE

Fig. 3. Pathogenicity assessment of Neocyphella psychrotropha (isolate LC01) on ‘Fuji’ apple. A, Wound-inoculated fruit at 30 days postinoculation (dpi) at 20°C (scale bar = 1 cm). B, Unwounded inoculation at 30 dpi (20°C), with an infection rate of approximately 10%. C, Wound-inoculated fruit stored after 6 months at −1°C. D, Leaf inoculation treatments: M-U (mock-unwounded), M-W (mock-wounded), I-U (inoculation-unwounded), and I-W (inoculation-wounded), imaged at 7 dpi/20°C.

Plant Disease @plantdiseasej.bsky.social · last wk.

In 2023, an unusual outbreak of soybean root rot (SRR) was observed in Harbin, Heilongjiang Province, China. Jing Zhang et al. report the first known report of SRR caused by #Colletotrichum sojae in China: https://doi.org/10.1094/PDIS-06-25-1180-RE

Fig. 1. A, Soybean root rot caused by Colletotrichum sojae in the field. B, The top and bottom of a C. sojae isolate colony on potato dextrose agar. C, Soybean root inoculated with C. sojae reisolated from the pathogenicity assays. D, Conidia. E, Conidiophore of C. sojae.

Plant Disease @plantdiseasej.bsky.social · last wk.

#Puccinia coronata f. sp. avenae (Pca) is a threat to oat production in Australia. Through virulence and genomic analysis of Pca isolates collected across Australian oat-producing regions, Zhouyang Su et al. identified new races and a new lineage: https://doi.org/10.1094/PDIS-11-25-2239-SC

Fig. 2. A maximum-likelihood (ML) phylogenetic tree of 380 Puccinia coronata f. sp. avenae isolates worldwide. A midpoint-rooted ML tree was constructed using 396,452 biallelic single-nucleotide polymorphisms, with 500 bootstrap replicates. Bootstrap support values ≥80% are indicated by white circles. Isolates collected in 2024 are shown with bold text. Previously characterized Australian lineages (L1 to L18) are shown with brackets. The newly described L19 is indicated with a star. Scale bar represents mean substitutions per site.

Plant Disease @plantdiseasej.bsky.social · last wk.

“Antifungal Properties and Genomic Analysis of Burkholderia pyrrocinia DLL-114, an Endophyte of Camphor Tree,” by Yixuan Ning et al. Learn more: https://doi.org/10.1094/PDIS-09-25-2010-RE

Fig. 3. Antagonistic effect of DLL-114 against plant pathogens. A, Botryosphaeria dothidea BDAY; B, Botrytis cinerea CMH; C, Alternaria tenuis COCG; D, Pyricularia grisea DW; E, Colletotrichum gloeosporioides CGAR; F, C. fructicola HML28; G, Nigrospora sphaerica LQH; H, Neofusicoccum parvum NPAU; I, A. tenuis OSF; J, Phomopsis vexans PV; K, C. boninense Co-zyc; L, Diaporthe pseudooculi DE; M, Fusarium oxysporum PKW; N, Rugonectria castaneicola NSZrc; O, Pestalotiopsis choerospondicola sp. nov. pc2-1.

Plant Disease @plantdiseasej.bsky.social · last wk.

Saffron corm rot, caused by #Fusarium oxysporum, has become a devastating threat to saffron cultivation in Shangri-La, China. Findings from Mingjia Wen et al. reveal the #rhizosphere ecological mechanism underlying corm rot progression: https://doi.org/10.1094/PDIS-07-25-1456-RE

Fig. 2. Disease progression of Crocus sativus bulb rot at different time points A, 0 h (control); B, 72 h; C, 96 h; and D, 120 h (scale bar = 10 mm).

Plant Disease @plantdiseasej.bsky.social · last wk.

Chenming Liu et al. systematically investigated the population structure, distribution of avirulence genes, and pathogenicity of #Magnaporthe oryzae using 174 monosporic isolates collected in 2021 from three counties in Hunan, China. Learn more: https://doi.org/10.1094/PDIS-09-25-1957-RE

Fig. 1. Resistance rate of monogenic lines against Magnaporthe oryzae in three different ecological regions of Hunan Province in 2021.

Plant Disease @plantdiseasej.bsky.social · last wk.

“Prevalence and Persistence of Oxytetracycline-Resistant and Copper-Tolerant Xanthomonas arboricola pv. pruni in Peach Orchards of the Southeastern United States,” by Milan Panth et al. Learn more: https://doi.org/10.1094/PDIS-08-25-1751-RE

Fig. 2. Visualization of leaf defoliation using a bubble chart as a function of bacterial spot incidence and severity on peach leaves. The defoliation is represented by the size and color of the sphere where smaller, blue-colored bubbles indicate minimal defoliation, and larger, red-colored bubbles indicate higher defoliation. Data from 2021 to 2024 from South Carolina orchards were compiled and analyzed to produce this figure.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Karen B. Torres-Valenzuela et al. revealed a diverse range of fungi associated with dieback and trunk cankers in pecan orchards in Sonora, Mexico, including #Pseudofusicoccum stromaticum, #Lasiodiplodia brasiliensis, and #Diaporthe caatingaensis: https://doi.org/10.1094/PDIS-10-25-2057-RE

Fig. 2. Pecan trees exhibiting dieback symptoms in orchards from Hermosillo, Sonora, Mexico. A to D, Symptoms observed in the trees. E to G, Cankers and wood damage.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Findings from Simranjot Kaur, Katia Viana, and Hardev Sandhu highlight the vulnerability of current sugarcane varieties to pineapple sett rot, especially under mechanical planting systems where smaller seedcane pieces are used. Learn more: https://doi.org/10.1094/PDIS-10-25-2050-RE

Fig. 1. The signs and symptoms of pineapple sett rot observed on the diseased seedcane collected from 3- to 4-month-old sugarcane fields at Everglades Agricultural Area. A, A gap in the field row showing dieback of a young shoot. B, Dead bud observed on the seedcane removed from soil. C, Internal discoloration or blackening of pith observed when the seedcane was split open. Front (D) and back (E) view of Thielaviopsis spp. cultures on potato dextrose agar media, and macroconidia (F) and microconidia (G) as observed under the light microscope.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Fengnian Wu et al. provide a species-resolved, region-wide assessment of #Cephaleuros red rust in China’s major oolong tea production areas and reveal pronounced geographic partitioning of pathogen communities: https://doi.org/10.1094/PDIS-12-25-2495-RE

Fig. 4. Microscopic features of Cephaleuros infection on oolong tea (Camellia sinensis) leaves in Fenghuang, Chaozhou, Guangdong. A, Enlarged upper surface lesion. B, Tufts of sporangiophores with zoosporangia on the lower surface at a lesion. C, Higher-magnification view of sporangiophore tufts with zoosporangia. D, Initial infection site with immature gametangia (ga). E, Transverse section of a lesion showing subepidermal thalli (arrows) beneath both surfaces, with necrosis of epidermal (ep), palisade (ps), and spongy (sp) tissues. F, Transverse section of a healthy leaf. Images in A, B, E, and F were taken at 100× magnification, and images in C and D were taken at 400× magnification.

Plant Disease @plantdiseasej.bsky.social · 2w ago

“Improving the Implementation of Disease Forecasting Systems and an Alternative Management Program to Mitigate Regulatory Concerns with Multisite Fungicides for Apple Scab Management,” by Līga A. Kalniņa and Kerik D. Cox: https://doi.org/10.1094/PDIS-07-25-1551-RE

Fig. 1. Apple scab incidence at the end of the standard-season management trial on fruit (A and C) and on terminal leaves (B and D). ‘Empire’ (A and B) and ‘Jonagold’ (C and D) cultivars in 2022 and 2023. Within each graph, different letters above bars indicate significant differences between means based on Tukey’s honestly significant difference test (P < 0.05). DSS = decision support system.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Xiaoxue Ji et al. found that fluopyram not only exhibited strong nematicidal activity against Heterodera glycines but also induced systemic resistance in soybean. Learn more: https://doi.org/10.1094/PDIS-10-25-2124-RE

Fig. 1. Nematode mortality and LC50 and LC90 of fluopyram and abamectin against Heterodera glycines second-stage juveniles. LC50 and LC90 mean the 50 and 90% lethal concentration, respectively. Data are pooled between repeats of experiments as there were no significant differences between experiments (P > 0.05).

Plant Disease @plantdiseasej.bsky.social · 2w ago

Di Liu et al. investigated the temporal and spatial dynamics of the #Fusarium graminearum species complex associated with Fusarium head blight in wheat from 2014 to 2023 in Mexico. Learn more: https://doi.org/10.1094/PDIS-01-26-0064-RE

Fig. 1. Geographic distribution of sampling sites in Mexico and yearly distribution of isolates collected across all locations from 2014 to 2023, excluding 2020.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Nidà M. Salem et al. establish gradual heat treatment as a robust, nonchemical, and commercially viable strategy to manage tomato brown rugose fruit virus in tomato seeds and highlight the critical importance of bioassays in certifying seed health: https://doi.org/10.1094/PDIS-10-25-2187-RE

Fig. 3. Transmission electron microscopy reveals virion degradation. A, Heat-treated, tomato brown rugose fruit virus (ToBRFV)-contaminated seeds show fragmented and degraded viral particles. B, Untreated, ToBRFV-contaminated seeds show intact, rod-shaped virions. Scale bars = 500 nm.

Plant Disease @plantdiseasej.bsky.social · 2w ago

“Low Diversity of Isolates of Calonectria ilicicola, the Causal Agent of Red Crown Rot of Soybean, Detected Across Illinois,” by Steven J. Clough et al. Learn more: https://doi.org/10.1094/PDIS-07-25-1424-SC

Fig. 1. Examples of red crown rot (RCR) disease symptoms and signs of the pathogen (Calonectria ilicicola) on soybean at a field in our Illinois surveys.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Sarita Poudel et al. demonstrate that early maturity soybean lines, which are essential for northern production regions, harbor meaningful and stable resistance to #Sclerotinia sclerotiorum that has been largely overlooked in previous research: https://doi.org/10.1094/PDIS-11-25-2197-RE

Fig. 1. The map illustrates the geographic diversity of selected soybean plant introduction (PI) lines from the United States Department of Agriculture-Germplasm Resources Information Network. All PI lines are defined as maturity groups 000, 00, 0, and I. The number next to each country name indicates the number of PI selected from each country to be evaluated for resistance to Sclerotinia sclerotiorum. The legend on the right-hand side also demonstrates a heat map of the number of PI lines selected from each country.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Hainan, China has experienced widespread foliar diseases in its durian orchards. Field surveys conducted between October 2023 and October 2024 and molecular analysis led Huan Xu et al. to identify six causal #Fusarium species: https://doi.org/10.1094/PDIS-01-26-0070-SC

Fig. 1. Symptoms of the diseased durian leaves with only Fusarium isolates obtained.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Findings from Edison Reyes-Proaño et al. suggest alfalfa fields in Idaho and other Pacific Northwest states provide reservoirs for the local isolates of pea streak virus that may pose a risk for pulse crop production. Learn more: https://doi.org/10.1094/PDIS-09-25-1861-RE

Fig. 2. Foliar symptoms observed in pea streak virus (PeSV)–positive plant species screened in host range studies at 2 weeks postinoculation (WPI).

Plant Disease @plantdiseasej.bsky.social · 2w ago

“Development and Validation of a Real-Time RT-qPCR Assay for the Detection of Citrus Yellow Vein Clearing Virus,” by Fatima Osman et al. Learn more: https://doi.org/10.1094/PDIS-10-25-2122-RE. And learn more about DAVN: https://www.apsnet.org/DAVN/Pages/default.aspx

Fig. 1. Symptoms of Citrus yellow vein clearing virus on lemon trees in Tulare, California. Yellow vein clearing dorsal side (A), water-soaked veins ventral side (B), nonsymptomatic leaf (C, left) and symptomatic leaf (C, right) showing yellow vein clearing and leaf deformation. Photos by G. Vidalakis and S. Bodaghi.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Elizabeth J. Indermaur et al. confirmed a new species of #Didymella from the eastern U.S. is a pathogen of invasive #Reynoutria japonica but is a poor candidate for biological control because of its ability to infect the crop species Rheum rhabarbarum: https://doi.org/10.1094/PDIS-05-25-1125-RE

Fig. 4. Disease symptoms caused by Didymella spp. on polygonaceous hosts. A and B, Reynoutria japonica inoculated with Didymella polygonacearum. C and D, Rheum rhabarbarum ‘Victoria’ inoculated with D. polygonacearum. E, Rh. rhabarbarum ‘Victoria’ inoculated with Didymella rhei, a known pathogen of Rheum spp. All leaves pictured are <6 cm in length.

Plant Disease @plantdiseasej.bsky.social · 2w ago

Wenxuan Yang et al. developed a reverse transcription recombinase polymerase amplification combined with lateral flow strip assay for on-site detection of rice stripe virus, rice black-streaked dwarf virus, and southern rice black-streaked dwarf virus: https://doi.org/10.1094/PDIS-02-25-0329-SR

Fig. 1. The results of the RT-RPA-LF assay for RSV, RBSDV, and SRBSDV.

Plant Disease @plantdiseasej.bsky.social · 3w ago

By integrating data from public databases, Zheng Zhang et al. constructed an up-to-date atlas of plant viruses and further established the Plant Virus Database for storing and organizing information about these viruses: https://doi.org/10.1094/PDIS-07-25-1393-SR

Fig. 3. Evolution of virome in monocots and eudicots. The inner ring represents monocot and eudicot members of the phylogenetic tree; the middle ring shows their corresponding plant orders; the outer ring indicates whether plants are from temperate or tropical regions. The outer bar chart displays the number of virus families infecting each plant.

Plant Disease @plantdiseasej.bsky.social · 3w ago

🌾 Mritunjoy Barman et al. conducted a statewide sampling during the 2023 to 2025 growing seasons across Nebraska to examine the infection dynamics of the causal agents of wheat streak mosaic disease in winter and spring cereal crops. Learn more: https://doi.org/10.1094/PDIS-09-25-1876-RE

Fig. 2. Symptoms in the sampled fields and collected leaves.

Plant Disease @plantdiseasej.bsky.social · 3w ago

Feature: “Modern Taxonomy as the Foundation for Identifying and Managing Fungal and Fungus-Like Plant Pathogens,” by Michael J. Bradshaw et al. Learn more: https://doi.org/10.1094/PDIS-12-25-2537-FE

Fig. 2. Examples of plant diseases discussed in this study and the species involved.

Plant Disease @plantdiseasej.bsky.social · 3w ago

Editor’s Pick: Wei-Ting Chuang et al. clarify the etiology of fungal gummosis disease in flowering cherries in Taiwan and demonstrates fungicide application strategies with potential for broader management of fungal trunk diseases in urban landscapes: https://doi.org/10.1094/PDIS-10-25-2065-RE

Fig. 1. Gummosis and canker symptoms in the flowering cherry and cotton tree. A, Clear to dark amber gum exudation from the trunk of Prunus campanulata. B, Internal wood browning and gum oozing beneath the bark. C, Wart-like swellings on a cherry branch (unknown species). D, Black cankers on the trunk of Bombax ceiba.

Plant Disease @plantdiseasej.bsky.social · 3w ago

Zhenyu Zhao et al. found α-pinene exhibits promise as a natural substitute for synthetic fungicides or as a building block for the creation of novel fungicides to combat rice sheath blight, caused by #Rhizoctonia solani: https://doi.org/10.1094/PDIS-10-25-2055-RE

Fig. 2. Effect of α-pinene on hyphal morphology of Rhizoctonia solani. A, The mycelium, B, result observed by the optical microscope, and C, result observed by the scanning electron microscope of normal R. solani. D, The mycelium, E, result observed by the optical microscope, and F, result observed by the scanning electron microscope of R. solani treated with α-pinene (1.0 mg/ml).

Plant Disease @plantdiseasej.bsky.social · 4w ago

“Spatiotemporal Distribution, Mechanisms, and Field Efficacy of Tebuconazole Resistance in Blumeria graminis f. sp. tritici (Bgt) Populations in Hebei, Henan, and Shandong Provinces, China,” by Qiuyan Bi et al. Learn more: https://doi.org/10.1094/PDIS-10-25-2160-RE

Fig. 5. Pathogenicity of sensitive and resistant Blumeria graminis f. sp. tritici (Bgt) isolates to wheat. HNLZ-3, HNHB-3, HBLC-3, HBYX-3, and SDTS-7 are sensitive isolates, and the rest are resistant isolates.

Plant Disease @plantdiseasej.bsky.social · 4w ago

Duoduo Wang et al. present the first study in Canada to evaluate the efficacy of fungicides for managing #Fusarium head blight in winter rye. Learn more: https://doi.org/10.1094/PDIS-09-25-1884-RE

Fig. 1. A, Treatment means of Fusarium head blight (FHB) severity across varieties; B, variety means of FHB severity across treatment. UUC, uninoculated-untreated control; H, heading; 10A, 10% anthesis; 80A, 80% anthesis; 6DA50A, 6 days after 50% anthesis; and IUC, inoculated-untreated control. The dots indicate the means, and the horizontal bars indicate the asymptotic lower and higher confidence limits. Means with different letters are significantly different at P < 0.05.