Agricultural authorities in Bong화 County, South Korea, issued an urgent orchard management advisory on August 10, 2026, warning farmers to protect apple crops from severe sunburn damage as persistent heatwaves and intense direct sunlight grip the region. According to the Bonghwa Agricultural Technology Center, prolonged high temperatures create critical risks for fruit production during peak summer growth phases.
Understanding Apple Sunburn Risks in Sustained Heatwaves
Sunburn—known locally as ilsog 피해—occurs when ambient air temperatures climb to 31°C or 32°C (88°F to 90°F) or higher while powerful solar radiation beats directly down onto fruit surfaces. When the skin temperature of an apple rises excessively, underlying cellular tissue suffers damage, turning the fruit’s surface brown or black. In severe cases, secondary pathogens such as anthracnose exploit these compromised areas, causing rapid decay and stripping the harvest of its commercial value, according to the Bonghwa Agricultural Technology Center.
To combat heat-induced crop losses, local agricultural experts stress that farmers must implement strict orchard water management alongside proactive canopy adjustments to shield vulnerable fruit from direct rays. Growers are advised to execute several protective measures during high-temperature advisories:
- Conduct sufficient irrigation during the early morning hours or after sunset to maintain deep soil moisture.
- Avoid excessive leaf removal on varieties currently entering their coloring and harvest stages.
- Deploy micro-sprinkler systems when ambient temperatures exceed 31°C to cool orchard microclimates.
- Apply sunburn-mitigation agents like calcium carbonate and utilize shade netting over vulnerable blocks.
- Monitor and apply timely pest and disease controls targeting mites and anthracnose.
Managing Damaged Fruit and Ongoing County Support
When dealing with fruit that has already sustained heat stress, agricultural specialists advise against immediate blanket removal. Instead, farmers should evaluate damage severity: fruit with minor blemishes should be carefully repositioned behind leaves or branches to prevent further exposure, while severely damaged or rotting apples must be promptly culled to halt the secondary spread of anthracnose.
To bolster local resilience, the Bonghwa County government is actively rolling out additional support initiatives aimed at subsidizing sunburn-mitigation materials. Extension officers are closely monitoring growth conditions and damage reports across major apple-producing belts, maintaining intensive technical guidance on heat and drought response until the current weather emergency subsides. “As extreme heat and high temperatures are expected to prolong, we urge fruit-growing households to thoroughly manage their orchards through micro-sprinklers, moisture control, and the timely application of sunburn prevention materials to minimize damage,” stated Jang Young-sook, head of the Bonghwa Agricultural Technology Center.
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