Solar treatments that raise the underbark temperature to lethal levels can also be used as a means of reducing beetle populations in infested logs. Such treatments can be done with or without plastic. For best results, arrange logs side by side in a single layer in a location that receives full sunlight several hours a day. The logs should to be rolled periodically to ensure all sides have been facing the sun for several weeks. Logs can be placed under clear plastic at least 6 mils thick with ultra-violet inhibitors.
Water logs prior to covering and seal edges with surrounding soil.
Both high temperature and mold will deter or prevent normal beetle development. High value trees can be sprayed with carbaryl to reduce beetle attacks. This spray is registered for use to prevent attacks on individual trees and is quite effective through one flight year. Follow label instructions when spraying. The best long-term method of prevention involves forest management.