Chungnam, Taean see pine wilt disease spread

Pine wilt disease is rapidly spreading across South Korea's Chungnam province, with a staggering 26-fold increase in affected trees reported this year compared to last. Local residents in Cheongyang and Taean counties describe seeing vast swathes of pine forests turning red, resembling autumn foliage even in summer.

“

A few trees had it last year, but this year the damage has suddenly spread throughout the entire forest. We told the county office and they injected them, but they still died.

"A few trees had it last year, but this year the damage has suddenly spread throughout the entire forest," said Park, a 75-year-old resident of Cheongyang. "We told the county office and they injected them, but they still died." In Taean, residents are also concerned about the spread of the disease, which turns pine leaves red, and the aggressive nature of the Siberian silk-bark beetle, a natural predator of the sawyer beetle that transmits the disease.

“

It's not just unsightly, but the Siberian silk-bark beetle, a natural enemy of the sawyer beetle that spreads the disease, also attacks people, making it unbearable.

The disease, often referred to as 'pine AIDS' due to its fatal nature, is caused by nematodes transmitted by pine sawyer beetles. These nematodes enter trees through wounds made by the beetles and block the flow of water and nutrients, leading to the tree's death. This year, South Korea has seen approximately 1.77 million trees affected nationwide, a significant increase from about 1.48 million last year.

“

Pine wilt disease has been on an increasing trend since 2022. Factors such as monitoring and control gaps during the COVID-19 pandemic, climate change, and wildfires have led to a significant increase in the vector insects.

Experts attribute the surge in pine wilt disease to climate change, which has accelerated the emergence of the beetles. The National Forest Science Institute predicts that the first day of adult Siberian silk-bark beetle emergence has advanced by 13.8 days in the last five years compared to the 1991-2020 period. A forest service official noted that the increase in pine wilt disease has been trending upward since 2022, exacerbated by factors like pandemic-related gaps in monitoring and control, climate change, and wildfires, all contributing to a significant rise in the beetle population.

“

We will establish an effective control strategy for the second half of the year.