Besides natural dispersal, what human activity is highlighted as a major factor in long-distance jumps for egg masses?

Answer

The movement of firewood

Human activity provides a major shortcut for long-distance jumps, most significantly through the movement of firewood, which can transport egg masses far outside established zones.

Besides natural dispersal, what human activity is highlighted as a major factor in long-distance jumps for egg masses?
insectmothlarvafactDefoliator