Effects of Lophodermium pinastri and Pullalaria pullulans on healthy and ozone-injured needles of Pinus strobus

Book · Wed Jan 01 04:00:00 EST 1969

OSTI ID:5002530

Costonis, A C; Sinclair, W A

Fungi most frequently associated with needle symptoms including those of ozone injury of P. strobus were determined by isolation studies. L. pinastri and P. pullulans were isolated from maximum of 1.8% and 4.0%, respectively, of lst-yr and 13% and 23% of 2nd-yr field-collected needles. Untreated and O/sub 3/-fumigated (7.0 +- 0.5 pphm, 4.5 hr) needle fascicles, resistant or sensitive to O/sub 3/ damage, on potted pines or detached, were inoculated with ascoapores of L. pinastri and/or conidin of P. pullulans. P. pullulans invaded only tissue previously killed by O/sub 3/. L. pinastri colonized maxima of 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.

• OSTI ID: 5002530
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CONIFERS
DISEASES
FEDERAL REGION II
FUNGAL DISEASES
INFECTIOUS DISEASES
INJURIES
NEW YORK
NORTH AMERICA
OZONE
PINES
PLANTS
SENSITIVITY
SYNERGISM
TOLERANCE
TREES
USA