Although sawyer beetles are not strong fliers, Nobuo Enda, a retired tree disease prevention and treatment expert formerly with the forestry department of the Japanese agriculture ministry, says that the beetles are light enough to be carried up to higher elevations by air currents. "This may be a reason for the pine wood nematode's spreading into Taiwan's high mountains," he speculates.
雖然「天牛慢飛」，從日本農業部林野廳退休的松樹病害防治專家遠田暢男卻表示，身輕如羽的天牛可能靠著氣流被吹往更高更遠的地區，「這或許是松材線蟲往台灣高山遷移的原因。」