Really it’s the vector beetle, ex Pine Sawyer beetle that needs to be stopped. Once it’s in it distributes nematodes and the tree is basically toast.
Here’s a scientific article too help understand the process and issues.
Explore Peer-reviewed Plant Pathology Resources Since its launch in 2000, the APS Education Center has provided free and open-access plant pathology resources and teaching materials as part of a dedicated APS outreach and public education initiative. The&nb...
www.apsnet.org
Best
DSD sends