plant pathology – Page 2

Hidden treasures of herbaria – even small collections contain a wealth of diversity: the powdery mildews of the North Carolina State Larry F. Grand Mycological Herbarium

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Scientists examined preserved powdery mildew samples stored in a university herbarium and discovered four previously unknown fungal species using DNA analysis. The study shows that even small museum collections contain valuable hidden biodiversity that cannot be discovered through visual examination alone. This research highlights why it is important to preserve and maintain herbarium collections rather than discard them due to space or funding constraints, as they serve as crucial resources for understanding fungal diversity and disease.

First Report of Trametes hirsuta, Causal Agent White Rot in Avocado Trees Grown in the State of Michoacán, México

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Researchers discovered that a wood-decay fungus called Trametes hirsuta is causing serious damage to avocado trees in Michoacán, México, the world’s largest avocado-producing region. The fungus infects tree trunks and branches, causing white rot that eventually kills the trees. About 60% of surveyed avocado trees showed signs of infection. Laboratory experiments confirmed that this fungus, previously known only as a decomposer of dead wood, can actively infect and destroy living avocado trees through wounds in the bark.

Clonostachys rosea, a Pathogen of Brown Rot in Gastrodia elata in China

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Researchers in China identified a fungus called Clonostachys rosea as the cause of brown rot disease affecting Gastrodia elata (Tian Ma), an important medicinal orchid plant. The disease causes brown spots on tubers that expand and darken, significantly reducing crop yield and quality. The study involved detailed examination of the fungus under microscopes, genetic analysis, and confirmation that the fungus could cause disease in healthy plants. These findings will help farmers prevent and control this disease through proper soil management and selection of healthy seed tubers.

Influence of Light Spectrum on Bread Wheat Head Colonization by Fusarium graminearum and on the Accumulation of Its Secondary Metabolites

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Researchers studied how different colors of light affect a fungal disease in wheat and the toxic compounds it produces. They found that blue light reduces disease spread but increases toxin production, while red light also reduces disease but increases different types of toxins. This discovery could help farmers better manage wheat diseases by understanding how light conditions affect both the fungus and the grain’s safety.

De novo Genome Assembly and Annotation of 12 Fungi Associated with Fruit Tree Decline Syndrome in ON, Canada

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Apple and stone fruit trees in Ontario have been dying at alarming rates since 2016. Researchers sequenced and analyzed the genetic code of 12 different fungi suspected of causing this decline. This study provides the first complete genetic blueprints for several fungal species, helping farmers and scientists better understand what causes the disease and develop ways to prevent it.

Whole-genome sequencing of Fusarium oxysporum K326-S isolated from tobacco

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Scientists have sequenced the complete genetic code of a fungus called Fusarium oxysporum that infects tobacco plant roots, causing them to wilt and turn brown. This fungus is a major problem for tobacco farmers because it lives in soil and is difficult to control. By mapping out all 17,272 genes in this fungus, researchers now have detailed information that will help them develop better ways to prevent and manage this disease.

Emergence of Fusarium incarnatum and Fusarium avenaceum in wilt affected solanaceous crops of the Northern Himalayas

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Researchers in Kashmir identified two fungal species, Fusarium incarnatum and Fusarium avenaceum, causing wilt disease in important vegetable crops like tomatoes, brinjals, and chili peppers. These pathogens cause yellowing of leaves, wilting, and death of plants, resulting in significant crop losses. This is the first time these particular fungi have been confirmed as wilt pathogens in these vegetables in India. The study emphasizes the need for better management strategies to protect these crops from fungal infections.

Histological Dissection of Fusarium-Banana Interaction Using a GFP-Tagged Subtropical Race 4 Strain of Fusarium oxysporum f. sp. cubense on Banana Cultivars with Differing Levels of Resistance

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Researchers used fluorescently-labeled fungal strains to visualize how banana wilt disease spreads inside banana plants. They found that resistant banana varieties can slow down the fungus by forming blockages (called tyloses) in their water-conducting vessels, though the fungus can still initially enter the plant. The study showed that the rhizome, an underground stem-like structure, is the key location where resistant plants successfully contain the fungus, which helps explain why some banana varieties are naturally more resistant to this devastating disease.

Harnessing Walnut-Based Zinc Oxide Nanoparticles: A Sustainable Approach to Combat the Disease Complex of Meloidogyne arenaria and Macrophomina phaseolina in Cowpea

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Researchers created tiny particles made from walnut leaves and zinc oxide that can fight harmful plant diseases caused by root-knot nematodes and fungal infections in cowpea plants. When applied to diseased plants, these natural nanoparticles significantly reduced pest populations, improved plant growth and health, and helped plants recover from stress without harming beneficial bacteria in the soil. This green technology offers farmers an environmentally friendly alternative to traditional chemical pesticides.

The polyphasic approach reveals two new species and two new records of Nigrospora (Apiosporaceae, Amphisphaeriales) associated with Aquilaria sinensis from China

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Researchers discovered two previously unknown fungal species and two new host associations of Nigrospora fungi found in Chinese agarwood trees (Aquilaria sinensis) from Guangxi province. Using both microscopic examination and DNA analysis, they identified and characterized these fungi as endophytes living within the plant tissues. These findings add to our understanding of fungal diversity in agarwood trees and may have applications for improving agarwood production in the traditional medicine and fragrance industries.

Research Keyword: plant pathology