VLT Oaktober – Talking Trees and Bad Beetles

Ever wonder if trees communicate with each other? There is a new body of research that sheds light on the complex and fascinating ways that trees interact. We will discuss these findings and learn how trees help each other respond to threats like invasive beetles, a significant issue affecting oaks in Southern California. The spread of invasive beetles like shot hole borer (Euwallacea spp.) and golden spotted oak borer (Agrilus auroguttatus) is a growing concern to oak survivorship in our area. Learn about a community science effort through iNaturalist to upload invasive beetle observations that can alert agencies and land managers. Docent and volunteer observations in oak woodlands throughout Southern California have led to the discovery of several infestations. Participating in this monitoring is a great way to help our trees and support meaningful oak restoration and management to ensure that oak woodlands persist in the face of climate changes.

Rosi Dagit, Principal Conservation Biologist for the Resource Conservation District of the Santa Monica Mountains, and Certified Arborist, has been learning from oak trees for many years. Learning about oak trees and woodlands and their role in the local ecology has been one of her passions, resulting in her leading a variety of research and restoration projects. She led development of the Early Detection Rapid Response Plan for Los Angeles County adopted in 2020, and previously coordinated the development and adoption of the Los Angeles County Oak Woodlands Conservation Management Plan (2011). Although formally educated as a marine biologist, Rosi loves helping folks understand why fish need trees!