In 2012, the following year of the Great East Japan Tsunami, rat traps were set on the skirts of rubble heaps and in an abandoned school. In May 2012, adhesive rat traps caught no rat specimen, but recorded evidence of rat infestation, such as feces, fur and foot prints on the surface. At the beginning of July 2012, sixteen Norway rats (Rattus norveigicus) and three roof rats (Rattus rattus) were captured by rat cages or bounce traps in the heaps in the Tsunami affected areas of Iwate and Miyagi Prefectures, showing that nine heaps out of 13 were positive with rats. In the survey in September 2012, rat infestation was higher than that in July. This survey further revealed that 15 out of 16 rubble heaps were positive with rats where 23 Norway rats and 8 roof rats were captured in 31 trap cages. The rats have tendency to break loose from the rubble heaps at the time of removing or selecting the refuse. We recommend control of the rats using rodenticides under the local government administration and with pest control operators of Iwate and Miyagi Prefectures.

Fly outbreaks including blow flies in the following year of the northern Japan great tsunami disaster were investigated around rubble mounts, abandoned school and fish processing plants in the Tsunami affected area. In the late of April, 2012, synanthropic flies such as house flies, Musca domestica, blow flies including Phormia regina, Calliphora nigribarbis and Sarcophagic flies were quite a few in the affected areas by adhesive fly trap collection. Those flies were not increased in the end of May by fly trap collection and insect net sweeping, and also a few in July collecting by the net. Disappearance of the synanthropic flies seem to have brought by removing rotten fish, dried up rotten fish or insecticide spraying in the previous year. Some lesser house flies, Fannia canicularis were collected in abandoned factories and an abandoned school in May and July. However, the lesser fly problem would not be occur due to far distances to human residences from hovering space. We concluded that fly problem would not be serious in the following year of the tsunami affected area.

Social wasps were collected from July to September 2009 with Townes white Malaise traps in the mountain area (330, 664, and 1,120 m above sea levels) of Toyama Prefecture, Honshu, Japan. A total of 345 individuals of 16 species were collected: Parapolybia indica, Pa. varia, Polistes chinensis antennalis, Po. rothneyi iwatai, Po. nipponensis, Po. snelleni, Vespa simillima xanthoptera, V. analis insularis, V. crabro flavofasciata, Vespula flaviceps lewisii, Vl. shidai shidai, Vl. vulgaris, Vl. schrenckii, Dolichovespula media sugare, D. saxonica nipponica, and D. norvegicoides pacifica. Vespula shidai shidai was the dominant species (59.1%), followed by Vl. schrenckii (15.7%). Although Vl. shidai shidai was dominant at the three altitudes, the species compositions differed among the altitudes. In the subfamily Polistinae, the abundance and the species richness decreased with altitude, and polistine wasps were not collected at the survey sites 1,120 m above sea level. In contrast, the abundance and the species richness increased with altitude in the subfamily Vespinae.

In June and September 2011, mosquito larvae were surveyed at 12 sites along the coast of Toyama Prefecture, Japan. Three genera and seven species of mosquitoes were collected. Aedes japonicus, Ae. albopictus, and Culex pipiens complex composed the majority of collected mosquitoes. The remaining mosquito species were few and included Tripteroides bambusa, Ae. togoi, Ae. flavopictus, and Cx. (Culiciomyia) sp. Mosquito bites in these areas might be caused by Ae. japonicus, Ae. albopictus, and Cx. pipiens complex. Mosquito larvae were collected from fresh water, except in an artificial container (salinity: 0.2%) inhabited by Ae. japonicus and Ae. albopictus.