Biochar as an integrated management tool against Phytophthora cinnamomi, a key driver of Quercus suber decline.
Trindade M, Del Frari G, Ribeiro H, Ferreira R
Soil Health
Cork oak forests covering Portugal's rolling hillsides — the source of every natural wine cork — are quietly dying, and a simple soil amendment you could mix in at planting time may be one of the most promising tools to stop it.
A destructive water mold called Phytophthora cinnamomi has been killing cork oak trees across Portugal for decades, rotting their roots before the trees can fight back. Scientists tested whether biochar — a type of charred organic material made from wood or algae — could protect young cork oaks when mixed into the soil. The results were striking: the right dose of biochar nearly wiped out the pathogen's reproductive structures and helped infected seedlings recover root growth by nearly 80% compared to untreated plants.
Key Findings
Acacia-derived biochar at 1% and wood-mix biochar at 5% soil concentration were optimal doses, significantly suppressing Phytophthora cinnamomi reproductive structures (p < 0.001).
Treated cork oak seedlings showed 79–80% greater root recovery above pathogen-challenged controls, indicating strong plant health benefits.
Biochar maintained favorable soil chemical properties across effective doses, suggesting it can suppress pathogens without degrading soil quality.
chevron_right Technical Summary
Researchers found that adding biochar — charcoal made from wood or seaweed — to soil can dramatically cut the spread of a devastating root-rot pathogen that kills cork oak trees, while also boosting tree recovery and growth.
Abstract Preview
Portugal has over one-third of the Quercus suber L. world area, a natural treasure threatened by a progressive decline, which has been witnessed during the last decades by increasing tree mortality...
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Quercus suber, commonly called the cork oak, is a medium-sized, evergreen oak tree in the section Quercus sect. Cerris. It is the primary source of cork for wine bottle stoppers and other uses, such as cork flooring and as the cores of cricket balls. It is native to southwest Europe and northwest...