喜界島における不妊虫放飼法によるウリミバエ根絶事業 ＶＩ フライトミルによる野生虫と増殖虫との飛しょう力比較

Abstract

The flight ability of the melon fly, Dacus cucurbitae COQUILLETT, was compared between the wild (F1 generation) and mass-reared strains (about F11 generation) at 1, 3, 5, 10, 20, and 30 days after emergence. Males and females of the mass-reared strain flew over a shorter distance than those of the wild strain at the age of 20 and 30 days. During the 2-hr experiment, 30 days old females of the mass-reared strain flew during a shorter period of time than those of the wild strain. The females of the wild strain took less rest than those of the mass-reared strain in 20 and 30 days old individuals. The males and females of the mass-reared strain flew with a lower velocity than those of the wild strain with the increase of age. Thus, the flight ability of the mass-reared strain seemed to be inferior to that of the wild strain at the age of 20 and 30 days. This tendency may be due to the fact that mating occurs earlier in the mass-reared strain than in the wild strain because the mass-reared strain had been selected to mate earlier and to lay more eggs earlier and additionally its longevity became shorter than that of the wild strain.