We investigated the first appearance date of the Indian meal moth, Plodia interpunctella, and cigarette beetle, Lasioderma serricorne, using outdoor pheromone traps installed throughout Japan in 2015. P. interpunctella first appeared on April 3, 2015 in Kyoto, followed by Okayama and Saitama. In contrast, the first Lasioderma serricorne appeared on May 10, 2015 in Niigata, followed by Saitama and Osaka. There was no significant correlation between the first appearance date of each species and the mean annual air temperature of each sampling site. The present study showed that P. interpunctella and L. serricorne are widely distributed throughout Japan.
We investigated the number of maize weevils, S. zeamais, captured by pheromone traps (TORIOS®) placed at outdoor sites in residential areas of the Kanto region, Japan. The survey was conducted at 7 sites in Tokyo, 1 site in Saitama, 1 site in Chiba and 4 sites in Ibaraki from April to July, and October to November, in 2015. A trap was set under the eaves or the balcony floor of condominiums in each survey site. We captured S. zeamais adults at Fucyu, Tokyo, in May (♀1) and June (♂1), and at Tsukuba, Ibaraki, in June (♂1). These results show S. zeamais is active outdoors during spring in the Kanto region of Japan.
We collected and counted overwintering maize weevils, Sitophilus zeamais, in outdoor brown-rice warehouses in Ibaraki Prefecture, Japan. The survey was conducted at 5 sites on 10 December 2015. We found S. zeamais adults under pieces of wood or concrete on the ground at 4 sites. There were 1, 4, 32, and 60 adults at these sites. We confirmed the ovipositional ability of the overwintering adults. The adults laid eggs in the brown rice. The resulting larvae developed into adults at 25°C, 70％ RH, and 16L: 8D.