In 2004, silvicultural control was firstly applied to a 20 ha stand
of ca. 90 ha of PWD-infested forest in Pohang. Felled logs were
burnt. In 2005, silvicultural control was also applied experimentally
in 0.5 ha of PWD-infested forest in Jinju, where all felled
logs were fumigated with metam-sodium (Kwon, 2006b). After
2005, silvicultural control was the main procedure for combating
PWD epidemics in newly infested districts. Silvicultural control was
applied in 16 out of 27 districts (city or county) experiencing new
PWD infections between 2005 and 2009 (Table 1). Silvicultural control
was also applied to heavily infested stands with >30% mortality
in long-infested districts (Forest Human Resources Development
Institute, 2008). Pine forests surrounding clear-cut zones formed
during silvicultural control were subjected to nematicide-injection
(N).