Researchers recently scaled the iconic General Sherman tree in Sequoia National Park to conduct a health check for bark beetles, an emerging threat to giant sequoias. The 2,200-year-old tree, the world’s largest, was found to be in good health, able to fend off any potential beetle attacks. This was the first time climbers had ascended the towering sequoia, which stands at 275 feet and draws tourists from around the world.
Giant sequoias, the largest living things on Earth, are facing increasing threats from climate change-induced factors like extreme heat, drought, and wildfires. Record-setting wildfires in 2020 and 2021 killed up to 20% of the world’s mature sequoias. While wildfires remain the most significant threat, researchers are now studying bark beetles, which have recently been able to kill sequoia trees.
Native to California, bark beetles have co-existed with sequoias for thousands of years but have only recently become a threat. The beetles bore into branches from the canopy, working their way down the trunk and killing the tree within months if left unchecked. The recent inspection of General Sherman was part of efforts to establish a health monitoring program for giant sequoias and detect beetle infestations early.
Researchers are also exploring the use of drones equipped with sensors and satellite imagery to monitor and detect beetle infestations on a larger scale within the forests. If infestations are found, officials may resort to methods like spraying water, removing branches, or using chemical treatments to combat the attacks. The goal is to ensure the long-term stewardship of these ancient trees in the face of changing environmental conditions.