Author | Lightnews

Plant Disease @plantdiseasej.bsky.social · 18h

T. Michael Likins et al. found that flutriafol drench provided season-long protection of boxwood plantings preinfected by Calonectria pseudonaviculata in the Mid-Atlantic but also resulted in significant phytotoxicity. Learn more: https://doi.org/10.1094/PDIS-12-24-2731-SC 🌿

Flutriafol Drench Provides Season-Long Protection of Boxwood Plantings Preinfected by Calonectria pseudonaviculata in the Mid-Atlantic | Plant Disease

Flutriafol drench application on 7 March without and with additional applications at 8- and 20-week intervals all consistently protected boxwood plantings preinfected by Calonectria pseudonaviculata in two gardens in Richmond, Virginia, through 21 Novem...

doi.org

Plant Disease @plantdiseasej.bsky.social · 1d

“Rapid and Simple Detection of Anilinopyrimidine Resistance in Botrytis cinerea by Combining Recombinase Polymerase Amplification with the CRISPR/Cas12a Assay,” by Fei Fan et al. Available in Vol. 109, No. 9 of Plant Disease: https://doi.org/10.1094/PDIS-11-24-2346-SR

Fig. 5.
Application of the RPA/Cas12a detection assay to diseased samples. A, Schematic illustration of the workflow of the RPA/Cas12a assay for diseased samples. E407K: Anilinopyrimidine (AP)-resistant isolate with the E407K mutation; WT: AP-sensitive isolate; BC: blank control with ddH2O. B, Detection of diseased samples with the RPA/Cas12a assay. A 365-nm UV flashlight is used to visualize fluorescence. Tubes 1 to 5: AP-resistant isolates with the E407K mutation (E407K); Tubes 6 to 10: AP-resistant isolates with the L412F mutation (L412F); Tubes 11 to 15: AP-sensitive isolates (WT); Tube 16: blank control with ddH2O (BC). The mycelia were collected from artificially inoculated tomato fruits with corresponding isolates to conduct the analysis.

Plant Disease @plantdiseasej.bsky.social · 2d

The USDA annual oat crown rust survey provides critical insights into the pathogen’s virulence patterns. Erin L. P. Moreau, Jakob M. Riddle, and Shahryar F. Kianian elucidated virulence dynamics of Puccinia coronata f. sp. avenae from the 2023 survey: https://doi.org/10.1094/PDIS-11-24-2408-SR

Fig. 1.
Collection locations of 2023 Puccinia coronata f. sp. avenae isolates by state (n = 238). The Northern and Southern regions are delineated by a thicker black line.

1 1 3

Plant Disease @plantdiseasej.bsky.social · 3d

Feature Article alert! “Understanding Oak Decline in Europe: Ecological Factors, Symptoms, Causative Agents, and Management Strategies,” by Giambattista Carluccio et al. 🌳 Available in Vol. 109, No. 9 of Plant Disease: https://doi.org/10.1094/PDIS-11-24-2401-FE

Fig. 4.
Characteristic symptoms of Phytophthora attacks. Mediterranean maquis with crown dieback and death of cork oak (Quercus suber L.) trees.

Plant Disease @plantdiseasej.bsky.social · 4d

Editor’s Pick: “Comparative Analysis of Hemp and Wheat Fusarium graminearum Populations,” by Henry Smith et al. Read now in Vol. 109, No. 9 of Plant Disease: https://doi.org/10.1094/PDIS-11-24-2452-RE

Fig. 1.
Kentucky state map showing the origin of Fusarium graminearum isolates. Counties in blue represent where a hemp isolate was obtained in 2022, red represents where a wheat isolate was collected in 2023, and yellow represents where both hemp and wheat isolates were obtained in their respective growing season.

Plant Disease @plantdiseasej.bsky.social · 7d

To improve detection of Pectobacterium actinidiae, a major kiwifruit canker pathogen in Asia and South America, Hui Wen Lee et al. developed a probe-based real-time PCR assay for rapid and sensitive detection: https://doi.org/10.1094/PDIS-05-24-1092-RE

Development of a Real-Time PCR Assay to Detect the Kiwifruit Pathogen Pectobacterium actinidiae | Plant Disease

Pectobacterium actinidiae is a significant kiwifruit canker pathogen reported from kiwifruit-growing areas in Asia and South America. To improve the diagnostic capability for this bacterium, a probe-based real-time PCR assay was developed for sensitive ...

doi.org

1

Plant Disease @plantdiseasej.bsky.social · 8d

Raul Allende-Molar et al. found Washington take-all decline (TAD) soils do not suppress Pythium root rot of wheat. 🌾 Learn more: https://doi.org/10.1094/PDIS-09-24-2041-RE

Pythium Root Rot of Wheat Is Not Suppressed by Indigenous 2,4-Diacetylphloroglucinol–Producing Pseudomonads in Take-All Decline Soils | Plant Disease

Take-all, caused by Gaeumannomyces tritici, and Pythium root rot, caused by a complex of Pythium spp., are important diseases of wheat in Washington State, U.S.A., and they often occur in the same plant. During wheat monoculture, a natural biocontrol of...

doi.org

Reposted by Plant Disease

American Phytopathological Society (APS) @plantdisease.bsky.social · 9d

On this #WorldFoodDay, we celebrate the efforts of those who nourish our communities, protect our planet, and shape a better future through better food for all. Explore resources to learn more about food security and sustainability. #FAO80

https://bit.ly/4nqN3x7

7 4

Plant Disease @plantdiseasej.bsky.social · 9d

Results from Zejun Cheng et al. demonstrate that the primer set developed in this study enables accurate and rapid quantification of Ditylenchus destructor density in soil and facilitates the prediction of disease incidence in sweetpotato: https://doi.org/10.1094/PDIS-07-24-1514-RE

Fig. 4.
Relationship between soil pH value, density of Ditylenchus destructor in soil, and disease incidence at harvest. A, Upper part of the figure shows healthy plots and sweetpotatoes, while the lower part shows D. destructor of sweetpotato occurrence plots and diseased sweetpotatoes.

1

Plant Disease @plantdiseasej.bsky.social · 10d

Field trials focusing on nonrotational fungicide programs were conducted by @JohnsonKendallA et al. to identify the most efficacious fungicides and/or FRAC groups for the management of Glomerella leaf spot and bitter rot on apple: https://doi.org/10.1094/PDIS-12-24-2773-RE

Fig. 1.
Symptoms of bitter rot (Glomerella fruit rot) and Glomerella leaf spot caused by Colletotrichum chrysophilum.

Plant Disease @plantdiseasej.bsky.social · 15d

Phylogenetic analysis by @DaisyHAhumada et al. identified Ganoderma adspersum—previously unreported in North America—as the main cause of root and butt rot linked to almond tree decline in California’s Central Valley: https://doi.org/10.1094/PDIS-03-24-0631-RE

Fig. 3.
Signs and symptoms of Ganoderma adspersum quick decline in almond orchards.

Plant Disease @plantdiseasej.bsky.social · 16d

Malick Bill et al. identified fungal and bacterial species linked to storage diseases of sugar beet roots in the Red River Valley of Minnesota and North Dakota, aiding strategies to reduce postharvest sucrose losses: https://doi.org/10.1094/PDIS-10-24-2188-RE @kandelsl

Fig. 1.
Sample collection from sugar beet piles.

1 1 1

Plant Disease @plantdiseasej.bsky.social · 17d

Narelle Nancarrow et al. highlight the complexity and specificity of the relationships between yellow dwarf viruses, the aphids that transmit them, and the plant hosts that they infect. @PiotrTrebicki Learn more: https://doi.org/10.1094/PDIS-11-24-2523-RE

Fig. 1.
Inoculation of plants with virus in experiment 1, which evaluated the efficiency of cereal aphids to transmit yellow dwarf viruses using single-aphid inoculations.

1

Plant Disease @plantdiseasej.bsky.social · 18d

Short Communication: “Pearl Bodies as a Potential Source of Secondary Transmission of Papaya Leaf Distortion Mosaic Virus in Carica papaya,” by Decai Tuo et al.: https://doi.org/10.1094/PDIS-11-24-2419-SC

Fig. 4.
Infectivity of pearl bodies from papaya leaf distortion mosaic virus–green fluorescent protein (PLDMV-GFP)–infected papaya plants. Papaya plants inoculated with pearl bodies of PLDMV-GFP–infected plants at 15 and 25 days postinoculation (dpi) showed systemic mosaic symptoms and GFP fluorescence at 20 and 15 days post rub-inoculation, respectively, but not in those inoculated with pearl bodies of mock plants.

1

Plant Disease @plantdiseasej.bsky.social · 22d

Botrytis cinerea, the causal agent of gray mold, has been reported in pomegranate orchards in Mexico. Alberto Patricio-Hernández and colleagues identified Bacillus velezensis as an effective fungicide against gray mold in pomegranate crops. Learn more: https://doi.org/10.1094/PDIS-10-24-2118-RE

Fig. 1.
Signs and symptoms of gray mold on pomegranate fruits in orchards in Chilcuautla, Hidalgo, Mexico. A, Healthy fruit. B, Typical gray mold lesions with brown spots of watery consistency on the rind. C, Advanced gray mold lesion with fragmentation of the fruit.

Plant Disease @plantdiseasej.bsky.social · 23d

Strategic mixtures of biological control agents with DMI fungicides to control diseases of fruit crops can result in additive interaction, synergism, or antagonism. @Jojo_We27 and Guido Schnabel evaluated the compatibility of 8 commercial DMI fungicides: https://doi.org/10.1094/PDIS-11-24-2367-RE

Impact of DMI Fungicides on Bacillus subtilis Cell Growth and Consequences for Disease Control | Plant Disease

Strategic mixtures of biological control agents (BCA) with demethylation inhibitor (DMI) fungicides to control diseases of fruit crops can result in additive interaction, synergism, or antagonism. To evaluate the compatibility of eight commercial DMI fu...

doi.org

Plant Disease @plantdiseasej.bsky.social · 25d

Downy mildew presents significant challenges to spring mix greens production in California. Emily Mae Locke-Paddon et al. identified sources of resistance to facilitate resistance breeding in baby kale: https://doi.org/10.1094/PDIS-11-24-2290-RE @kalloldas91

Fig. 1.
Geographic locations of Hyaloperonospora brassicae isolates used in the baby kale (Brassica oleracea and other species) host screening.

Plant Disease @plantdiseasej.bsky.social · 28d

Short Communication: “Mycotoxin Contamination of Hazelnut Grown in Azerbaijan and Aspergillus Communities Associated with the Crop,” by Fagan Aghayev et al.: https://doi.org/10.1094/PDIS-12-24-2623-SC

Fig. 1.
Map of Azerbaijan showing sample collection sites (red circles) for hazelnut samples from November 2022.

Plant Disease @plantdiseasej.bsky.social · Sep 24

Results from Jing Wang et al. indicate that Streptomyces noursei strain S86 fermentation products have the potential to be developed as biological controls of Fusarium crown rot disease in the field. 🌾 Learn more: https://doi.org/10.1094/PDIS-10-24-2109-RE

Fig. 6.
Example photos of seedling disease protection assays in the greenhouse (n = 3, 10 plants per replicate).

Plant Disease @plantdiseasej.bsky.social · Sep 22

Xu Qin et al. investigated the biocontrol effect and mechanism of crown gall disease in Japanese cherry trees by Bacilllus velezensis FZB42, a prototype strain of the plant growth-promoting rhizobacteria. Learn more: https://doi.org/10.1094/PDIS-10-24-2085-RE

Fig. 6.
Model diagram of the mechanism of biocontrol of crown gall disease of cherry trees by Bacillus velezensis. The plant growth-promoting rhizobacterium B. velezensis FZB42 can activate the ISR of cherry trees and inhibit the growth of causative Agrobacterium strains by producing four antibiotics (macrolactin, difficidin, bacilysin, and surfactin). ET, ethylene; ISR, induced systemic resistance; JA, jasmonic acid.

1 2 3

Plant Disease @plantdiseasej.bsky.social · Sep 19

Valentina Valencia Bernal et al. identified four Botryosphaeriaceae species causing avocado branch canker in California; Neofusicoccum luteum was the most prevalent. Fluazinam was identified as the most effective fungicide across species. 🥑 Learn more: https://doi.org/10.1094/PDIS-12-24-2674-RE

Fig. 1.
Symptoms of avocado branch canker disease observed in avocado trees in Southern California. A and B, Cankers on branches and trunks. C, Dieback and necrosis of twigs in the canopy. D, Cross-section of an infected branch showing a wedge-shaped canker extending deep into the wood. E, Necrotic branches with wilting leaves still attached. F, Necrotic lesion under the surface of a canker.

Plant Disease @plantdiseasej.bsky.social · Sep 18

Short Communication: “Characterization of Virulence of Puccinia coronata f. sp. avenae in Australia in the 2023 Growing Season,” by Duong T. Nguyen et al.: https://doi.org/10.1094/PDIS-09-24-2049-SC

1 1 1

Reposted by Plant Disease

Chloé Delmas @chloedelmas.bsky.social · Jul 17

Our last work on esca incidence in french vineyards is out in @plantdiseasej.bsky.social ! Identification of ecoclimatic indicators of esca disease through 20 years of large-scale vineyard monitoring in France | Plant Disease apsjournals.apsnet.org/doi/10.1094/...

Identification of ecoclimatic indicators of esca disease through 20 years of large-scale vineyard monitoring in France | Plant Disease

Plant disease incidence depends on host and pathogen phenology, and the abiotic environment. Plant health and productivity are, therefore, strongly influenced by global environmental changes, particul...

apsjournals.apsnet.org

3 2

Reposted by Plant Disease

Pascal Frey @pascal-frey.bsky.social · Jul 23

Happy to share our new paper is out in @plantdiseasej.bsky.social:
Development of a new tool to detect Melampsora medusae f. sp. tremuloidae causing rust disease on Populus tremuloides.

#ForestHealth
#TreeHealth
#ForestPathology
#RustFungi

doi.org/10.1094/PDIS...

A leaf of Populus tremuloides infected by Melampsora medusae f. sp. tremuloidae. Photo credit: Philippe Tanguay, Canadian Forest Service.

3 6

Plant Disease @plantdiseasej.bsky.social · May 19

Florida’s strawberry industry faces a rising threat from Neopestalotiopsis sp., which survives in soil across seasons.
Galvin Alonzo, Juliana S. Baggio, and Natalia A. Peres evaluated fumigants to manage crown and soilborne inoculum. 🍓 doi.org/10.1094/PDIS...

Broadcast fumigated field prior to strawberry transplanting (A) and strawberry field with row middles highlighted between white lines (B).