Leaf beetles (Coleoptera, Chrysomelidae) intercepted by the import plant quarantine at sea- and airports of Hokkaido, northern Japan

Leaf beetles intercepted during plant quarantine inspections in Hokkaido, northern Japan were surveyed and listed to understand the trend in species interceptions from 1980 to 2023. Consequently, a total of eleven species in four subfamilies were collected under the inspections: 1) Plateumaris pusilla (Say, 1826), 2) Crioceris duodecimpunctata (Linnaeus, 1758), 3) Chrysomela tremula Fabricius, 1787, 4) Aulacothorax sp., 5) Agelastica coerulea Baly, 1874, 6) Galerucella placida Baly, 1878, 7) Medythia suturalis (Motschulsky, 1858), 8) Altica sp., 9) Longitarsus ishigakiensis Kimoto, 1965, 10) Disonycha alternata (Illiger, 1807), and 11) Phyllotreta striolata (Fabricius, 1801), seven of which were found on commodities unrelated to their host. This high proportion of hitchhikers suggests that pathways other than host plants should be considered in alien leaf beetle risk assessments.