Delays in Epidemic Outbreak Control Cost Disproportionately Large Treatment Footprints to Offset

Area of Science:

• Plant pathology
• Epidemiology
• Disease ecology

Background:

• Epidemic control strategies often prioritize spatial treatment areas, neglecting the critical role of intervention timing.
• Wheat stripe rust (WSR) is a significant long-distance dispersed plant disease impacting global agriculture.

Purpose of the Study:

• To investigate the synergistic effects of treatment timing and spatial area on suppressing epidemic outbreaks.
• To determine the optimal balance between early intervention and treatment coverage for effective disease management.

Main Methods:

• Conducted full-factorial field experiments using ring culls of varying sizes and timings (1.125, 1.25, 1.5 latent periods) for WSR.
• Utilized in silico computer simulations to model disease spread across diverse epidemic parameters (R0, prevalence, duration).

Main Results:

• Earlier treatment timing demonstrated a significantly greater suppressive effect on WSR spread compared to the size of the treatment area.
• Simulations indicated that substantial increases in treatment area are needed to offset even minor delays in intervention timing.
• Proactive disease surveillance can be cost-effective by enabling early treatments that require smaller intervention zones.

Conclusions:

• Timeliness of intervention is a more critical factor than spatial extent in controlling epidemic plant diseases.
• Early detection and rapid response are crucial for efficient and effective epidemic outbreak management.
• Integrating proactive surveillance with timely treatments offers a cost-effective approach to disease control.