Difference in the Timing of Larval Jumping Behavior of Mass-Reared and Newly-Colonized Strains of the Melon Fly, Dacus cucurbitae COQUILLETT(Diptera:Tephritidae)

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Mean periods from egg seeding to larval jumping (EJ-period) of the melon fly, Dacus cucurbitae, were compared between mass-reared (MS:F_<50>) and newly-colonized strains (NS:F_<13>) at three egg densities. The EJ-period of MS was significantly longer than that of NS at each density: 7..6, 10.1 and 13.1 d in MS, and 6.5, 6.7 and 8.2 d in NS, respectively, at densities of 50, 300 and 3,000 eggs/450 ml of medium. The proportion of MS and NS larvae which had matured by the 6th day after egg seeding amounted to 75.0% and 77.8%, respectively, and those matured by the 8th day attained 98.8% and 99.5%, respectively, at an egg density of 300/450 ml. the difference between the percentages of the two strains was insignificant, indicating that the period from egg seeding to larval maturation (EM-period) of MS was almost equal to that of NS. These results suggest that the prolonged EJ-period of MS was caused not by a lengthened EM-period but by delayed larval jumping behavior after maturation.
日本応用動物昆虫学会の論文
1992-05-25