Abstract
Limited outbreak of the Asiatic locust occurred in a pasture of Minaminasu-machi Tochigi Pref. in 1978. Population density of the locusts in the outbreak area was higher than in any other places in Tochigi Pref. But biometric studies showed that the general appearance of the adults collected from the outbreak area was almost similar to that of solitary adults from Utsunomiya near Minaminasu. A small scale mass-flight and group oviposition were observed in the field of outbreak area, and the feeding habits changed to polyphagous ones. It was considered that the locusts in the outbreak area were in the initial stage of the phase transformation. No outbreak was observed in the next year.
