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Ecological characteristics and geographical distribution of Alfalfa weevil (Hypera postica Gyllenhal) in Korea
Alfalfa weevil (Hypera postica Gyllenhal) belongs to the family Curculionidae, Order Coleoptera and it is one of invasive alien species in Korea. In Korea environment, this species was found in 2000 first time through the Korean quarantine inspections. Although various researches have been studied in the Europe, US, China and Japan, only few research has been performed in Korea. In this study, the life cycle, morphology and the host plants of Alfalfa weevil were investigated in the natural environment. Nine plants of total 28 host plant species known as the host plants were characterized as their wild host plants in Korea (6 and 3 of 9 were naturalized and native plants in Korea, respectively). The geographical distribution was very wide from south (Jeju) to north (Yeoncheon) area of the peninsula and the favorite habitats were park, cultivated and grass land. This species has been found easily anywhere because it takes common leguminous plants such as clover, chinese milk vetch and alfalfa. These results suggest that Alfalfa Weevil can be one of the most-damaging insect pests of leguminous crops when it adapts to Korean climate.
