When does poplar wool start?

1. The first high incidence period is around April 10, and the main flying floc is Populus tomentosa, and the main area is the urban area.

2. The second high incidence period is from late April to early May. The main flying flocs are Populus euramericana, Populus cathayana, weeping willow and Salix matsudana, which are mainly distributed in urban areas and plain areas.

3. The third high incidence period is in mid-May, and the main flying floc is Populus euramericana, mainly in mountainous areas.