Table 3. Coefficient of change distance in pine wilt isease boundary.

average change distance		application coefficients	note
Reducionof the pine wilt disease boundary area	less than −1.5 km	0.7
	less than −1.5 to −1.0 km	0.8
	less than −1.0 to −0.5 km	0.9
	less than −0.5 to 0.5 km	1.0	this scope is considered unchanged
Extensionofthe pine wilt disease boundary area	less than +0.5 ~ 1.0 km	1.1
	less than +1.0 ~ 1.5 km	1.2
	+1.5 km or more	1.3