Yosaku Sheet
(Fumigation Sheets)

The work of fumigating pinewood that has been damaged from pine wood nematode benefits from the cooperation of local officials and residents, and from long-term preventative efforts.

When pine wood nematodes enter a pine tree, leaves change color and wither in about a month, and new leaves turn reddish-brown and drop. Pine wilt disease occurs in forests nationwide, excluding the area of a cooler climate, and it kills not only weakened trees but even healthy trees and spreads like an infectious disease.

Pine wood nematodes and pine sawyers are in a symbiotic relationship. Nematodes that ride the pine sawyers are carried to a healthy pine, in which they multiply and spread the disease.
The yearly cycle of damage, for example in a Japanese forest starts during May-July when pine sawyers carrying nematodes escape from a pine tree that died the previous year, and jump onto another healthy pine tree. Nematodes from the pine sawyer enter the tree, and the pine needles wither around late August, turn reddish-brown, and by around October, the entire tree dies.

By packing the sheet in a bag custom-made for the "Yosaku Sheet" (Fumigation Sheet), it can now be carried on one's back, which frees both hands and allows easier transport onsite when carrying tools and climbing steep mountains.

Foldable sheets made of biology-friendly, biodegradable plastic