Effects of Lophodermium pinastri and Pullularia pollulans on healthy and ozone-injured needles of Pinus strobus
Fungi most frequently associated with needle symptoms, including those of ozone injury on Pinus strobus, were determined by isolation studies. Lophodermium pinastri and Pullularia pullulans were isolated from up to 1.8% and 4.0%, respectively, of first-year, and 13% and 23% of second-year, field-collected needles. Untreated and O/sub 3/-fumigated (7.0 +/- 0.5 pphm, 4.5 hr, up to three times at 1-month intervals) needle fascicles, resistant or sensitive to O/sub 3/ damage, on potted pines or detached, were inoculated with ascospores of L. pinastri and/or conidia of P. pullulans. P. pullulans invaded only tissue previously killed by O/sub 3/ L. pinastri colonized up to 6% of both fumigated and untreated attached O/sub 3/-resistant needles; 23.5% of fumigated and 10% of untreated O/sub 3/-sensitive attached needles; 32% and 40%, respectively, of detached sensitive and resistant needles naturally exposed to O/sub 3/; and 20% of fumigated O/sub 3/-sensitive detached needles. Spreading chlorotic to necrotic lesions on detached needles characterized the late stages of pathogenicity by L. pinastri. Such symptoms were not observed on attached needles, from which the fungus was often isolated in the absence of any symptoms. L. pinastri is considered to be capable of independent pathogenicity but favored by injuries including those caused by ozone.
- Research Organization:
- Cornell Univ., Ithaca, NY
- OSTI ID:
- 5603797
- Journal Information:
- Phytopathology; (United States), Journal Name: Phytopathology; (United States) Vol. 57; ISSN PHYTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
CONIFERS
DISEASE RESISTANCE
FUNGI
INJURIES
NECROSIS
OZONE
PATHOLOGICAL CHANGES
PINES
PLANT DISEASES
PLANTS
POLLUTION
SENSITIVITY
TOXICITY
TREES