OPM Termite Practice Exam

What is a characteristic effect of white rot fungi?

1. It strengthens wood

2. It causes a “bleach effect”

3. It enhances wood color

4. It adds a glossy finish

The correct answer is: It causes a “bleach effect”

White rot fungi are known for their unique ability to decompose lignin, which is a key structural component of wood. This process not only breaks down the lignin but also leads to a noticeable "bleach effect" on the wood. The bleaching occurs because white rot fungi effectively remove the darker pigments typically associated with the lignin, resulting in lighter-colored wood. This distinguishes white rot fungi from other types of fungi, such as brown rot, which primarily degrade cellulose and leave the lignin intact, causing the wood to darken rather than lighten. The "bleach effect" is significant in various environmental and practical applications, particularly in terms of wood recovery and the aesthetic qualities of wood products impacted by fungal activity. Thus, understanding the characteristic effects of white rot fungi enables better management practices in forestry and wood preservation.