Since its detection in Oregon in 2001, the lethal sudden oak death disease has ravaged thousands of tanoaks on the state’s south coast. Traditionally, efforts to mitigate the spread involved quarantining affected areas and incinerating diseased trees. However, given the prohibitive costs associated with these methods, stakeholders have sought more economical alternatives for managing the infectious debris, or “slash.”

A promising alternative has emerged in the form of a flame cap biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More kiln—a simple, cost-effective method for converting diseased wood into biochar, a charcoal-like substance. This process entails controlled oxygen exposure to limit carbon combustion during slash burning, producing biochar that enhances soil structure and moisture retention.

Innovative trials for this technique were spearheaded by Oregon State University Extension Service’s Norma Kline and Chris Adlam, in collaboration with Kelpie Wilson of Wilson Biochar. The team conducted experiments in Coos and Curry counties as part of the interagency Sudden Oak Death Program. Adlam organized a defensible space webinar and a field workshop that showcased the kiln’s benefits as a fuel reduction tool, while Kline facilitated a cooperative project in Curry County exploring the kiln’s viability in sudden oak death mitigation.

Despite these educational initiatives, field tests indicated that the biochar method, although beneficial in certain situations, proved time-intensive and not universally cost-effective. The Oregon Department of Forestry, having received training in this method, found its application impractical for broad-scale disease management, suitable only in specific, targeted circumstances.

The ongoing exploration of varied approaches, such as the biochar kiln, underscores the importance of collaborative problem-solving in addressing forestry challenges. While not a panacea, such innovations offer a valuable part of a broader strategy aimed at combating sudden oak death in Oregon.

READ MORE: Exploring biochar as an alternative sudden oak death treatment