How does eucalyptus’s resistance to wood-rotting fungi compare to tropical hardwoods?

Eucalyptus and tropical hardwoods are both valued for their durability, but their resistance to wood-rotting fungi varies significantly. Eucalyptus, known for its high density and natural oils, exhibits strong resistance to fungal decay, often outperforming many temperate species. However, tropical hardwoods like teak, ipe, and mahogany are renowned for their exceptional longevity and innate resistance to fungi due to their dense grain and high levels of natural preservatives like silica and tannins.

Studies show that while eucalyptus performs well in moderate climates, tropical hardwoods generally excel in humid, high-moisture environments where fungal activity is rampant. The key difference lies in their chemical composition—tropical species often contain compounds that actively inhibit fungal growth, whereas eucalyptus relies more on physical barriers like tight grain structure.

For applications requiring long-term outdoor use, tropical hardwoods may still be the superior choice, but eucalyptus offers a more sustainable and cost-effective alternative with respectable fungal resistance. Proper treatment and maintenance can further enhance eucalyptus's performance, narrowing the gap between the two.