Photochemical oxidant injury and bark beetle coleoptera scolytidae infestation of ponderosa pine. II. Effect of injury upon physical properties of oleoresin, moisture content, and phloem thickness

Journal Article · Wed May 01 00:00:00 EDT 1968 · Hilgardia; (United States)

DOI:https://doi.org/10.3733/hilg.v39n06p127· OSTI ID:6037910

Cobb, Jr, F W; Wood, D L; Stark, R W; Miller, P R

Studies were made during the summer, 1966, to determine the effects of air pollution injury (i.e., chlorotic decline) of ponderosa pine on various factors related to tree physiology. The results of these studies show that disease caused by photochemical atmospheric pollution affects certain physiological properties of ponderosa pine that may be related to increased susceptibility to bark beetles. Oleoresin exudation pressure, yield, and rate of flow were substantially reduced in severely affected trees, but crystallization of resin increased as the severity of the disease became greater. Both sapwood and phloem moisture contents were less in diseased trees. Phloem thickness in advanced-diseased trees was less than 60% of that in healthy trees.

• OSTI ID: 6037910
• Journal Information: Hilgardia; (United States), Vol. 39:6
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
OLEORESINS
CRYSTALLIZATION
PHOTOCHEMICAL OXIDANTS
TOXICITY
PINES
PLANT DISEASES
SENSITIVITY
AIR POLLUTION
CHLOROSIS
COLEOPTERA
MOISTURE
ANIMALS
ARTHROPODS
CONIFERS
INSECTS
INVERTEBRATES
PATHOLOGICAL CHANGES
PHASE TRANSFORMATIONS
PLANTS
POLLUTION
TREES
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)