SACRAMENTO, Calif. — Scientists confirmed Wednesday that California’s coastal redwoods, as well as Douglas firs, are among species susceptible to a disease that is devastating the state’s oak trees.

Drought and insects have killed an unprecedented number of Oregon’s Douglas fir trees during the last decade, costing billions in timber value, damaging infrastructure and ramping up wildfire danger.

Douglas firs, hemlocks and ponderosa pines are fundamental parts of Oregon’s natural forests. In fact, there are people working across the state to breed better versions of those trees to be more ...