The resistance against white-rot fungus Trametes versicolor was studied for chemically modified samples
of hardwood tropical species Teak (Tectona grandis) and Melina (Gmelina arborea), which were treated
with acetic anhydride for three different reaction times. Acetylated samples with different weight
percent gain (WPG) and untreated solid blocks were exposed to the fungus for ninety days. The weight
percent loss (WPL) due to the fungal attack was determined for each treatment, for both treated and
untreated samples. It was found that treated Teak samples have good protection against fungal attack,
but WPG does not affect significantly this protection. For Melina it was found that at higher values of
WPG, a higher protection is achieved.