Cucurbit Downy Mildew Epidemiology and Management
Summary
Cucurbit downy mildew, caused by the obligate oomycete Pseudoperonospora cubensis, poses a persistent threat to production of cucumber, melon, squash and related crops worldwide. The pathogen disperses through airborne sporangia and, under favourable cool and humid conditions, rapidly infects leaf tissue, leading to chlorosis, necrosis and yield losses that can exceed 90 per cent in susceptible cultivars. Epidemiological studies have revealed distinct seasonal and regional cycles, with primary inoculum arising from overwintering sites or long‐distance spore transport. Pathotype diversity, driven by shifts in virulence genes, has eroded resistance in many traditional varieties. Management strategies now centre on integrated disease management, combining host resistance breeding, targeted fungicide applications and disease forecasting systems based on real‐time weather data. Breeding efforts have delivered quantitative resistance loci and novel broad‐spectrum resistance genes, while advances in molecular diagnostics enable early detection in field and seed material. Genomic and transcriptomic analyses of both host and pathogen are elucidating key defence pathways and effector repertoires, offering new opportunities for precision breeding and novel control measures. Adoption of cultural controls, such as crop rotation, canopy management and optimised irrigation, further reduces disease pressure and fungicide dependence. Future challenges include maintaining durable resistance in the face of pathogen evolution and integrating emerging biocontrol agents and RNA‐based technologies into holistic management programmes.
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Cucurbit Downy Mildew Epidemiology and Management publication trend
The graph below shows the total number of articles in cucurbit downy mildew epidemiology and management across all publications each year (not limited to Nature Index journals).
Technical terms
Oomycete: A group of fungus-like, water-mould pathogens to which Pseudoperonospora cubensis belongs.
Transcriptomics: The comprehensive study of RNA transcripts produced by the genome under specific conditions.
Metabolomics: The large-scale analysis of small molecules and metabolic pathways in biological samples.
Quantitative trait locus (QTL): A chromosomal region that contributes to variation in a quantitative trait such as disease resistance.
Pathotype: A distinct grouping of pathogen isolates defined by their compatibility with specific host genotypes.
References
- Comparative Analysis of Transcriptomics and Metabolomics Reveals Defense Mechanisms in Melon Cultivars against Pseudoperonospora cubensis Infection. International Journal of Molecular Sciences (2023).
- Fine mapping of a novel QTL DM9.1 conferring downy mildew resistance in melon. Frontiers in Plant Science (2023).
- Assessment of fungicide product applications and program approaches for control of downy mildew on pickling cucumber in North Carolina. Crop Protection (2021).
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