18 million trees died in California last year

LOS ANGELES – Another 18 million trees in California died over the last year, a grim toll that nonetheless officials see as a sign the epic forest die-off in the state’s mountains is finally slowing.

A study by state and federal forest officials released Monday noted that the 18 million dead trees since the fall of 2017 marks a major decline from the last study in 2016, which detected 62 million dead trees, and 2017, which found 27 million dead trees.

Officials credited the shift to more rain, which has lessened drought conditions in California forests and strengthened trees’ ability to fight off beetles.

In the last few years, California has seen the most devastating wildfires in its history as a result of the drought and beetle epidemic that, combined, kill off trees and generate more fuel for fires to burn through.

The beetles had been rapidly killing trees in the 4,500-foot to 6,000-foot elevation band of the central and southern Sierra range. It could take centuries for the trees to repopulate, if they ever do.

The dead trees have made for hotter, more intense fires that have resulted in the devastation of the Thomas, Mendocino Complex and Camp fires.

In all, more than 147 million trees have died across 9.7 million acres of federal, state, local and private land in the state since the drought began in 2010, according the study.

The slower tree mortality rate is encouraging, but it’s no cause to breathe a sigh of relief yet, experts say.

“Eighteen million trees is still a lot of trees,” said Randy Moore, regional forester for the USDA Forest Service.

To make a difference in the forests’ density, 500,000 acres of national forest land would have to be treated annually. To come up with that number, experts calculate how much forest management it would take to make the forest resilient enough to do minimal damage every time forest fires recur, approximately every 12 years, Moore said.

Since 2016, federal, state, and local agencies have felled 1.5 million dead trees in areas that pose the greatest risk to live and property, according to the U.S. Forest Service, the state’s Forest Management Task Force and Cal Fire. The devastation of recent fires has put the pressure on, urging agencies to work together on forest management.

As a result, this past year officials got closer to the 500,000-acre annual goal than ever before, treating about 300,000 acres of national forest land, Moore said.