The damage caused by pine wilt disease in Korea began in 1988, about 30 years ago, and it was not a major problem till around 2000; then the damage increased markedly but declined after the establishment of enhanced countermeasures in 2005 under the special law on pine wilt disease control. Based on the premature judgment that the outbreak of the pine wilt disease had been successfully prevented, the control strategy, including the clear-cutting method which had made it possible to eliminate the asymptomatic carriers was interrupted. As a result, since 2012 pine wilt disease has spread to the whole country again and killed more than 2 million trees in 2014. Recently, the concept of asymptomatic carriers has been introduced into the control guidelines, and thereby it becomes possible to cut down the pine trees surrounding the damaged dead tree when selected by the resin exudation survey, and it becomes also possible to clear-cut some of the target areas. In this paper, we will show the actual status of pine wilt damage and the countermeasures against asymptomatic carriers in Korea.