1. UC IPM
Brown, dead needles especially on older foliage of a coast redwood, <i>Sequoia sempervirens,</i> due to root exposure to excess boron in irrigation water.
Brown, dead needles especially on older foliage of a coast redwood, Sequoia sempervirens, due to root exposure to excess boron in irrigation water.
Credit: HortScience Inc., Pleasanton, California