Pathogen Dynamics and Management of Erwinia amylovora in Fruit Crops

Erwinia amylovora, the causal agent of fire blight, poses a severe threat to pome fruit cultivation worldwide, notably in apple and pear orchards. Infection typically initiates at blossoms or wounds, where the bacterium multiplies and produces a protective exopolysaccharide that facilitates systemic spread through the plant’s vascular system. Key virulence determinants include the amylovoran polysaccharide, a type III secretion system that delivers effector proteins into host cells, and biofilm formation that enhances persistence on plant surfaces. Environmental factors such as temperature, humidity and insect vectors govern epidemic development, while survival in epiphytic reservoirs and the viable but non-culturable state underpin seasonal recurrence. Management strategies encompass cultural practices (pruning, wound protection), chemical controls (antibiotic or resistance-inducing trunk injections), host resistance breeding and emerging molecular approaches targeting critical enzymes. Integration of biocontrol agents and targeted enzyme inhibitors offers promising avenues to reduce reliance on broad-spectrum antibiotics. A holistic understanding of pathogen ecology, host–microbe interactions within the plant holobiont and pathogen adaptation to diverse climates underlies the design of sustainable fire blight control programmes with global applicability.

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Pathogen Dynamics and Management of Erwinia amylovora in Fruit Crops publication trend

The graph below shows the total number of articles in pathogen dynamics and management of erwinia amylovora in fruit crops across all publications each year (not limited to Nature Index journals).

Technical terms

Exopolysaccharide: A high-molecular-weight polymer secreted by bacteria that forms a protective matrix around cells.

Amylovoran: The specific exopolysaccharide produced by E. amylovora critical for virulence and biofilm formation.

Holobiont: The host plant together with its associated microbial communities acting as an ecological unit.

Type III secretion system: A needle-like apparatus used by Gram-negative bacteria to inject effector proteins into host cells.

Inhibition constant (Ki): A quantitative measure of the affinity of an inhibitor for its target enzyme, indicating the concentration required to reduce activity by half.

References

1. Inter-species interactions between two bacterial flower commensals and a floral pathogen reduce disease incidence and alter pathogen activity. mBio (2024).
2. Determination and Kinetic Characterization of a New Potential Inhibitor for AmsI Protein Tyrosine Phosphatase from the Apple Pathogen Erwinia amylovora. Molecules (2023).
3. Screening for Novel Beneficial Environmental Bacteria for an Antagonism-Based Erwinia amylovora Biological Control. Microorganisms (2023).
4. Control of fire blight (Erwinia amylovora) on apple trees with trunk-injected plant resistance inducers and antibiotics and assessment of induction of pathogenesis-related protein genes. Frontiers in Plant Science (2015).
5. Virulence Factors of Erwinia amylovora: A Review. International Journal of Molecular Sciences (2015).