Inhibitor injection will put curse of catkins to an end

Some 20,000 female willows and poplars in Beijing will get special injections by May to stop flying catkins.

Catkins, or flower clusters, often wreak havoc on people's allergies and disrupt traffic by reducing visibility on roads.

Horticulturists will burrow up to 2 centimeters into the trunk and inject a liquid growth inhibitor, which will halt reproduction but still encourage vegetative growth of the tree.