Seasonal Occurrence and Summer Diapause of the Onion Maggot, Delia antiqua (Meigen) (Diptera : Anthomyiidae)

고자리파리의 발생소장과 하면상황

  • 박정규 (농업기술연구소 곤충과) ;
  • 현재선 (서울대학교 농과대학) ;
  • 조동진 (경남농촌진흥원 식환과) ;
  • 최귀문 (농업기술연구소 곤충과)
  • Published : 1990.12.01

Abstract

Studies were carried out to examine seasonal occurrence and emergence pattern of the onion fly, Delia antiqua (Meigen), in the field of Chinju city in Gyeongnam province from 1984 to 1987. Trap catch revealed that the onion fly had three generations in a year, the second flight being partial; the peaks of adult occurrence were at mid April for the overwintered generation (1st flight), at early June for the first generation (2nd flight), and at the period from late September to early October for the autumn generation (3rd flight). It was shown that parts of the pupae in the first and almost all of the pupae in the second (or autumn) generation underwent summer diapause. The pupal periods were less than 22.4 days for the non-diapaused pupae, while those of the diapause. The pupal periods were less than 22.4 days for the non-diapaused pupae, while those of the diapaused pupae were form 8.5 to 145 days in the first generation in he filed, being shorter for the pupae pupated later. This resutled in synchronization on the emergence of these diapaused pupae at late September, with the adults from the second generation pupae. The ratio of diapausing pupae increased among the later pupated ones in the first generation ; the pupae which had been pupated in early May included 43.8% of diapausing pupae, while more than 86.7% of the pupae were under diapausing state for the pupae pupated in late May and thereafter. More than 93.3% of the pupae went into diapause, regardless of pupation time for the second generation.

Keywords

Onion maggot;Delia antiqua;seasonal occurrence;summer diapause