Help Prevent the Spread of the Polyphagous Shot Hole Beetle
Together, we can help reduce the spread of this invasive borer and protect our native trees and beloved oaks.
1. Please do not to import firewood or mulch from outside the Valley.
2. Mulch (as finely as possible) any downed wood on your property and leave it there.
3. Wrap firewood in clear plastic sheeting and leave it in the sun. This “cooks the beetles and the fungus and also increases biological consumption of the fungus by bacteria.
4. Cover your mulch piles with a tarp.
We are following the research closely and making changes to our practices based on what we learn. We have already suspended the movement of mulch around the Valley. Click to learn more about the Polyphagous Shot Hole Borer.
These photos of the Tijuana River were taken only months apart. Please help prevent this from happening here!
Before the polyphagous shot hole beetle
After the polyphagous shot hole beetle
