Implications of Chamaccyparis Obtusa (Cypress) Pollen in the Cedar-Cypress Pollination Season

Chamaccypariso btusa (cypress) counts in Nagoya City were recorded in 1990 and 1991. The proportion of cedar (Cryptomeria Japonica) and cypress pollen varied from year to year, with the cypress count being 5.2% in 1990 and 34.7% in 1991. The frequency of positive reaction in skin tests and RAST (score>2) for cypress was 44.7% and 56.5%, respectively. One of these cases gave a positive intradermal reaction to cypress alone. This suggested the importance of cypress pollen in the late cedarcypress pollination season.