Effects of Protection Time on Infection of Rice Panicle Blast
Fangfang Guo1, Ruihui Wang2, Huayuan Yao3
1Department of Plant Pathology, China Agricultural University, Beijing 100193, China.
Plant Disease
|February 4, 2024
Summary
Protecting rice heads from initial heading to the early dough stage significantly reduces panicle blast disease. Adjusting planting dates also helps rice escape Magnaporthe oryzae infection.
Area of Science:
- Agricultural Science
- Plant Pathology
- Crop Protection
Background:
- Panicle blast, caused by Magnaporthe oryzae, is a major global rice disease.
- Understanding rice panicle susceptibility at different growth stages is crucial for effective management.
Purpose of the Study:
- To evaluate the impact of rice head covering and planting dates on panicle blast infection.
- To determine the susceptible period of rice panicles to Magnaporthe oryzae.
Main Methods:
- Field experiments were conducted over two years (2016-2017).
- Rice heads were covered with sulfuric acid paper bags at various timings from heading to 15 days post-heading.
- Panicle blast incidence was recorded in relation to planting dates and covering treatments.
Main Results:
- Covering rice heads significantly reduced panicle blast, indicating susceptibility up to 15 days post-heading.
- Early planting dates correlated with higher panicle blast incidence.
- Cultivar choice and environmental conditions also influenced disease severity.
Conclusions:
- Protecting rice heads from initial heading to early dough stages is vital.
- Adjusting planting dates can help rice escape blast pathogen infection.
- Integrated disease management should consider resistant cultivars, timely protection, and fungicide application based on infection risk.
