Illegal logging
Most of the damage to the park's lands has come from illegal logging, grazing, illegal mining and damage done by visitor's automobiles, especially in the crater of the volcano. Illegal logging has had the most detrimental effect. The park overall is subject to an annual deforestation rate of 0.5%, but over 13,000 of the parks 17,000 hectares show some degree of disturbance in its ecosystem, such as new meadows being created where forests have been cleared. Agriculture has diminished in the park proper but trout farms have appeared. In areas where there is still forest, most of this forest is more sparse. Until 2000, about 40% of dense pine forests were lost to logging. Another problem that the trees being cut are the healthiest, leaving the weakest and sick behind, making the remaining forests susceptible to pests and diseases.