AEZ : Vol. 40 (2005) , No. 4 551-555

Interspecific hybridization between Liriomyza sativae Blanchard and L. trifolii (Burgess) (Diptera: Agromyzidae)

Susumu Tokumaru¹⁾ and Yoshihisa Abe²⁾

1) Kyoto Prefectural Agricultural Research Institute
2) Laboratory of Applied Entomology, Graduate School of Agriculture, Kyoto Prefectural University

(Received February 4, 2005)
(Accepted May 24, 2005)

Abstract
We confirmed the occurrence of interspecific hybridization between Liriomyza sativae and L. trifolii on kidney bean (Phaseolus vulgaris L.) at 25°C under a 15L–9D photoperiod regime. Among 48 replications of L. sativae females and L. trifolii males tested, females of 19 replications (39.6%) oviposited, but no eggs hatched. In contrast, among 115 replications of L. trifolii females and L. sativae males tested, females of 47 replications (40.9%) oviposited and progeny from 10 replications (8.7%) developed to adult eclosion. The hybrid offspring were obtained only when several L. trifolii females and several L. sativae males were placed together. The hatchability, pupation rate, and adult emergence rate of hybrid flies were 14.9%, 94.9%, and 61.8%, respectively. All the hybrid adults were female (n=127). When these females were backcrossed with males of either species, none oviposited. The mean adult longevity of a hybrid female was 19.2 d.

Key words:

Liriomyza sativae, Liriomyza trifolii, interspecific hybridization, oviposition, backcross