Symptoms and Signs
Laminated root rot mainly attacks Douglas fir, Mountain hemlock, Western hemlock, Grand fir, and Pacific silver fir. The disease infects trees between 6 years and their year of rotation (the period of years between when a forest stand is established and when it receives its final harvest). Diagnostic symptoms include crown yellowing and thinning, distress of cones, red brown stained outer heartwood, and separation of annual rings. Also, plants infected with laminated root rot are usually in patches or groups since the disease is spread within a short range. Infected or decayed roots break close to the root forming “root balls.” Laminated root rot is frequently detected during ground surveying when canopy openings and standing dead and fallen trees are observed. Signs of Laminated root rot are the red fungal hairs between sheets of decomposing wood and also the buff colored mycelia on the outside of the roots.
Read more about this topic: Laminated Root Rot
Famous quotes containing the words symptoms and, symptoms and/or signs:
“Social movements are at once the symptoms and the instruments of progress. Ignore them and statesmanship is irrelevant; fail to use them and it is weak.”
—Walter Lippmann (1889–1974)
“For anyone addicted to reading commonplace books ... finding a good new one is much like enduring a familiar recurrence of malaria, with fever, fits of shaking, strange dreams. Unlike a truly paludismic ordeal, however, the symptoms felt while savoring a collection of one man’s pet quotations are voluptuously enjoyable ...”
—M.F.K. Fisher (1908–1992)
“Chaucer sawed life in half and out tumbled hundreds of unpremeditated lives, because he didn’t have the cast-iron grid of a priori coherence that makes reading Goethe, Shakespeare, or Dante an exercise in searching for signs of life among the conventions, compulsions, self-justifications, proofs, wise saws, simple but powerful messages, and poetry.”
—Marvin Mudrick (1921–1986)