Although Japan had no concept of pollinosis, attention had been paid to it since before World War II. 1964 saw the emergence of Japanese Cedar (JC) pollinosis, and the increase in patients became a national problem. It was speculated that this was the result of encouraging the planting of Cupressaceae trees nation-wide in the post-war period. In the mid1980s, the pollinosis research group of the Ministry of Health and Welfare (MHW) was established to address the increase in cedar pollen and JC pollinosis from various perspectives. The research group initiated a pollen antigen pollen survey to provide information for the treatment and prevention of pollinosis and created a pollen map and a pollen calendar. A large amount of Cupressaceae pollen grains was found to increase gradually, with significant annual fluctuations, and the prevalence of pollinosis increased. After the study group ended, long-term surveys were continued at volunteer facilities, and changes in pollen dispersal due to climate change were reported. Pollinosis causes a variety of systemic symptoms including respiratory symptoms, and there is evidence of an increase in PFAS (Pollen-Food Allergic Syndrome) since around 2000. In Kyushu patients with Bet v1 positive PFAS are on the increase. Long-term surveys utilizing not only the gravity method but also the volumetric method and other differential advanced technologies are desired for airborne pollen survey methods in the future.

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キウイフルーツかいよう病Psa3の発生に伴い，キウイフルーツ生産者は，花粉の安定確保に向け，自家採取を見直している．キウイフルーツ花粉の自家採取は重労働であるため，効率化が求められている．そこで本研究では，一斉採花による効率的な花粉の採取方法について検討した．本手法で花粉採取量が最も多かったのは，中心花が５分咲き頃であったことから，この時期が適していると判断された．また，一斉採花は慣行の個別採花と比べ，採花期間が1／6程度と短くなり，一日当たりの花粉採取量は2.5倍に増加したため，花粉採取作業の軽労化が期待できた．その一方で，本手法で得られた花粉の総量は個別採花の半分以下になり，花粉の発芽率も20％程度低くなったことから，その改善が課題であると考えられた．

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Progress of the pollen fronts of Cryptomeria japonica and Chamaecyparis obtusa in 2022 were monitored by tracking the first day of pollen release from these species using a Durham sampler at 81 sites for the former and 72 sites for the latter between Kyushu and Hokkaido in Japan. The results showed that by the middle of February, the C. japonica pollen front had passed through all of Kyushu, parts of western Chugoku and Shikoku, as well as the parts of Kinki, Tokai and southern Kanto. By late February, it had passed through central Chugoku, eastern Shikoku, almost all of Kinki, central Chubu and Kanto. By early March to midMarch, it had reachedparts of Hokuriku, northern Kinki and parts of southern to northern Tohoku, although it had already reached some areas in this region in late February through early March. By late March, it had reached the northernmost tip of Tohoku and the eastern parts of Hokkaido. It finally reached central Hokkaido in early April. The C. obtusa pollen front was first observed in the southern parts of Kanto. By midMarch, it had reached all of Kyushu, central Chugoku, southern Shikoku, the parts of Tokai and southern Kanto. By late March, it had passed through the Chugoku, Kinki, Chubu, Kanto and Tohoku regions. By early April, it finally reached several small areas in Kinki, Hokuriku, Tohoku, and it should be noted that it was also observed in the suburbs of Sapporo City in central Hokkaido.

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