Effects of photochemical oxidant injury of ponderosa and Jeffrey pines on susceptibility of sapwood and freshly cut stumps to Fomes annosus. [Pinus ponderosa; Pinus jeffreyi; Fomes annosus; Trichoderma spp. ; Polyporus versicolor; Poria Monticola]
Ponderosa and Jeffrey pine sapwood samples and freshly cut stumps from trees with different amounts of oxidant injury were inoculated with Fomes annosus. With stumps, percentage of surface cross-section area infected and extent of vertical colonization were determined 1 mo and 6-10 mo after inoculation, respectively. Increase in surface area infection with increased oxidant injury, expressed as upper-crown needle retention, was statistically significant for ponderosa pine (P=0.01), but was not for Jeffrey pine. Also, the rate of vertical colonization was greater in stumps from severely oxidant-injured trees than in those from slightly injured trees. The relationship between injury and colonization was significant for Jeffrey pine (P = 0.05) and for ponderosa pine at one site (P = 0.03), but nonsignificant (P = 0.18) for ponderosa pine at a second site. Increased susceptibility of stumps to F. annosus appeared to be associated with decreased colonization by other fungi (especially Trichoderma spp. and blue stain fungi). Laboratory tests indicated that decay susceptibility of excised sapwood to F. annosus apparently was not affected by oxidant injury with Jeffrey pine, but weight loss of ponderosa pine sapwood was correlated with decreased injury (greater needle retention). On the other hand, weight losses of Jeffrey pine caused by Polyporus versicolor and of ponderosa pine caused by Poria monticola were correlated with increased injury (increased needle chlorosis). 27 references, 2 figures, 3 tables.
- Research Organization:
- Forest Service, Lakewood, CO
- OSTI ID:
- 6427699
- Journal Information:
- Phytopathology; (United States), Vol. 70:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PHOTOCHEMICAL OXIDANTS
BIOLOGICAL EFFECTS
PINES
INJURIES
EXPERIMENTAL DATA
FUNGAL DISEASES
FUNGI
LEAVES
NECROSIS
PATHOGENS
PLANT DISEASES
ROOTS
SENSITIVITY
WOOD
CONIFERS
DATA
DISEASES
INFECTIOUS DISEASES
INFORMATION
NUMERICAL DATA
PATHOLOGICAL CHANGES
PLANTS
TREES
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)