Type of Document Master's Thesis Author Alger, Larry Allen URN etd-02132009-172201 Title Previsual detection of stressed coniferous trees Degree Master of Science Department Entomology Advisory Committee
Advisor Name Title Heikkenen, Herman John Committee Chair Aleida, S. P. Committee Member Bunce, George Edwin Committee Member Grayson, James McD. Committee Member Keywords
- foliage fade
Date of Defense 1974-05-06 Availability restricted Abstract
The study consisted of two parts: following the fade rates of killed field-grown Virginia pine (Pinus virginiana Mill.); and to study the effects of different stresses on seedlings.
Foliage fade rates of killed field-grown Virginia pine varied with the time of the year the tree was killed. Little variation in fade rates was found between years.
Foliage of seedlings grown under stress due to: girdling; sevpring; defoliating; and drought, were studied by paper chromntographv, cross sectioning, and photography. The four pigments found appeared to decline proportionately as the foliege went from green to red. An error in technique resulted in uninterpretable needle cross sections. Photography using black and white, black and white infrared, color, and color infrared films gave no previsual detection of stress.
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