Abstract
Airborne pollens were studied daily by gravity slides from February 1962 to
June 1963.
There were two main pollen periods: a minor one in early spring due mainly to
conifers, and a major one in summer due mainly to grasses.
Grasses were responsible for 65 % of the pollen grains counted. They were
present from September to May and most abundant in December and January.
The commonest grasses observed in flower were: Chloris gayana, November-
March; Cynodon dactylon, September-April; Paspalum dilatatum, October-March;
P. urvillei, October-February; Panicum maximum, October-April; Rhynchelytrum
repens, October-April; Eragrostis tenuifolia, October-March; Digitaria didactyla,
December-March; Themeda australis, September-December.
Because of their prevalence, high pollen yield, and allergenicity, Chloris gayana
and Cynodon dactylon probably constitute the greatest risk of pollinosis in Brisbane.
The commonest tree pollens found were those of the Cupressaceae, Eucalyptus,
and Casuarina; among the plants and weeds those of Compositae and Plantago.
It is likely that pollen, although important in causing hay fever, is an uncommon
cause of asthma because: (a) being mostly over 20μ in diameter, it would rarely
penetrate to the bronchioles; (b) there is no clear correspondence between the seasonal
distributions of pollens and asthma.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
33 articles.
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