Airborne pollens in Brisbane

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