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Red-Necked Longhorn Beetle Infests Cherry Trees in Japan Prompting Tree Removals
Authorities in Japan are removing hundreds of cherry trees to contain the spread of the red-necked longhorn beetle, which infests sakura trees by burrowing into their trunks. The pest, first detected in 2012, has affected 17 of Japan's 47 prefectures. Additional threats to cherry blossoms include a fungal condition and climate-driven shifts in blooming times.
Apr 10, 5:22 AM·1m read1 source
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The pest first appeared in central Japan in 2012 and has since spread to 17 of Japan's 47 prefectures.
The beetle also affects peach, persimmon, and plum trees. Early detection through signs like frass—larval excrement mixed with wood particles—allows for treatment.
Measures Communities are implementing citizen reporting systems to aid detection.
Witch's broom, a condition affecting the Somei-Yoshino variety—the most common cherry cultivar—causes disfigurement and inhibits blooming. Climate change has raised Japan's average temperatures by 1.3 degrees Celsius over the past century, per Japan Meteorological Agency data.
Peak blooming has advanced by 1.2 days per decade since 1963, with acceleration since 2020, especially in Tokyo. The shifts have led to cancellations of flower-viewing tours in prior seasons, impacting tourism.
