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NPR Science Friday: California Trees Battle Beetle Assault Amid Drought

Media Coverage

Across the state of California, millions of trees are dying each year—but it’s not from old age. The ongoing drought is causing extreme water stress in many forests, which paradoxically leads trees to release pheromones that attract another threat: bark beetles. According to forest ecologist Christina Restaino, water stress also cuts the trees’ ability to produce sap, a first-line defense against beetles.


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