Seasonal fluctuation of the parous rate of Aedes albopictus at a thicket in Kobe City, Japan from 2015 to 2019

e parous rate of Aedes albopictus was investigated by human bait-sweep net collection in a thicket of Kobe City from 2015 to 2019. e overall parous rates from 2015 to 2019 were 49.7%, 45.3%, 36.9%, 37.2%, and 45.6%, respectively. e results from every investigation year highlighted a relationship between the number of individuals and the parous rates. e relationship was notable in summer. In 2015, when the number of individuals was the highest in the middle of August, the parous rate was high at 68.4%. In 2016, when the number was slightly less in early August and late August, the parous rates were still high, at 63.6% and 76.5%, respectively. During late July and early August in 2017, the numbers were less and the parous rates were low (20.7% and 27.3%, respectively). In 2018, dry ice (300~500 g) was used to attract mosquitoes. A total of 513 individuals were collected in midSeptember and the parous rate was 20.0%. In late July and early August, the number of individuals were 31, 35 and the parous rates were 26.7% and 42.4%, respectively. In 2019, when there were a large number of individuals in August and September, high parous rates such as 59.7%, 82.4% were observed.