The nematodes 'quiet migration into Taiwan's mountains is thus far confined to a small number of areas. But the pine wilt disease epidemic in northern Taiwan also began with sporadic cases. In late 1984 the rate of nematode disease in pine trees was 5 %; today it has risen to more than 50 %.
線蟲偷偷移民台灣山區，雖然尚未大規模發生，但北部平地線蟲也從點狀開始它的第一步，七十四年低地的松樹得病率百分之五，如今已超過百分之五十。