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Almond - Phytophthora Root and Crown Rot

Direct copy from UC IPM website to word document Statewide IPM Program, Agriculture and Natural Resources, University of California All contents copyright © 2009 The Regents of the University of California. All rights reserved. Symptom expression depends upon how much of the root or crown tissues are affected and how quickly they are destroyed. Generally, crown rots advance rapidly and trees collapse and die soon after the first warm weather of spring. Leaves of such trees wilt, dry, and remain attached to the tree. Chronic infections, usually of the roots, cause reduction in growth and early senescence and leaf fall. These trees may be unthrifty for several years before succumbing to the disease. Phytophthora infections typically kill young trees because their root systems and crown areas are small compared to those of mature trees.

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