Mendocino County fire authorities have added their voices to a heated debate over a timber-management practice that poisons unwanted hardwood trees and leaves them to decompose in forests, creating what some say is an increased fire hazard in a state already plagued by tinder-dry conditions in its fourth year of drought.
Fire officials are calling for tighter limits on the decades-old practice, which uses chemicals in place of more expensive mechanical means to eliminate the trees. The private timberland company at the center of the debate — Mendocino Redwood Co., which owns more than 10 percent of Mendocino County’s land mass — says the practice is safe, but local fire officials say it effectively adds fuel to an already flammable situation.
“This is a life safety concern,” said Albion Little River Fire Protection District Chief Ted Williams, whose 44-square-mile coastal fire district includes and is surrounded by commercial timberland.
He and his board of directors are contemplating an ordinance that would limit how long poisoned trees can be allowed to stand on land in the district’s jurisdiction.
The proposed ordinance “says these trees are a nuisance,” Williams said.
The fire district also is asking the Mendocino County Board of Supervisors to review the practice and consider countywide regulations for the “hack and squirt” operations, so named because they include cutting a tree, then injecting an herbicide into the wound. The treatment begins killing the trees within months, but it takes years for them to decompose.
Such operations appear to be largely unregulated because Cal Fire considers tanoak to be “a kind of weed,” Williams said.
“Unchecked by public oversight, it poses life safety risks to both residents and firefighters,” he wrote in a letter to supervisors.
The supervisors are scheduled to discuss the issue Tuesday afternoon at their regular meeting.
Timberland managers and the Cal Fire officials who regulate their harvest operations said they’re listening and responding to citizen concerns but have downplayed the fire danger, saying the dead trees may increase forest flammability initially, but the danger dissipates over several years and eventually — after about a decade — leaves forests at less risk from large wildfires.
The volume of flammable material in a forest is just one of many factors — including topography and weather — that can contribute to forest fires, Cal Fire officials said.
“It’s a question with a lot of variables,” Cal Fire Battalion Chief Shawn Zimmermaker said. “It could actually make for less fires.”
Mike Jani, president and chief forester of Mendocino Redwood Co., contends the dead trees aren’t the dire fire risk Williams says they are.
He admits they are more flammable for at least the first year after treatment, when their leaves dry out but remain on the tree. But the risk declines when the leaves fall, which reduces the chance for fires to travel from treetop to treetop, Jani said.
He said the herbicide operations are a critical part of the company’s efforts to restore forests transformed by overlogging to their original conifer-dominated states.
“We’re trying to get it back,” Jani said.
Killing the tanoaks and other brush gives the commercially valuable conifers — redwoods and Douglas fir — a chance to compete for light and water, said Jani, who heads both the Mendocino and Humboldt Redwood companies, which own about 222,000 acres of forest in Mendocino County, 7,000 acres in Sonoma County and more than 209,000 acres in Humboldt County.