Stress response as a basis for disease susceptibility in Ponderosa Pine Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6w924f12c

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  • Trees stressed by artificial and natural means were sampled for response in growth and vigor, carbohydrate content, resin pressure characteristics, and water relations. Tree response was found to reflect both the severity and type of stress imposed. Crown color and appearance were reliable indicators of prolonged stress and advanced decline of the host. Growth, measured by leader and needle lengths, was a sensitive indicator of stress in young trees. Trees in three root rot severity classes ranging over healthy, infected, and advanced disease were sampled for oleoresin exudation pressure. They averaged 6, 4, and 2 atmospheres pressure respectively. Trees with 4 atmospheres were beginning to decline and became attractive to bark beetles at one atmosphere. Responses in water relations and starch content of wood were inconclusive. The effects of drought and stand stagnation enhanced results in some sample trees.
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