STUDIES ON THE LEAFMINERS; LIROMYZA CICERINA (RONDANI) AND LIRIOMYZA BRYON/AE(KALTENBACH) (DIPTERA: AGROMYZIDAE) AND THEIR PARASITOIDS IN FABA BEAN IN EGYPT

Lidomyze cicerina (Pendant) is a new recorded pest species at­tacking laba bean, Viola labs L., at Damnhour and with L. bryonise (Kal­tenbach) at Sids and El-Zarka. L. bryoniae was found with L. safeties (Blanchard) and L. congesta (Becker) at Luxor. Mine density, larval and pupal parasitism were studied on untreated faba bean plants at Damn-hour and Sids during 19994000 season. Mine density was generally higher at Sids than at Damnhour. It coincided 35.6. 37.3% and 1.6, 10.9% of larval and pupal parasitism. In both regions, mine density in­creased gradually then declined at the peaks of parasitism, alter two weeks from infestation and during March. Larval parasitism and mine density harboured the highest levels on the lower and middle leaflets when compared with the other two levels. The majority of flies and larval parasitoids, which were Dlgtyphus Issas (Walker), Remiplarsenus zitehise­bossi (Ertl6s), thrysonotomia (Achrysocheretta) sp.", Pnigatio sp. and Clomp:Vssp. (Eulophidae) emerged during the active season. Synchroni­zation was found between time of host emergence and abundance of the larval parasiloid D. isaea in active season, but not in diapauso sea­son. Asynchrony was observed between the larval-pupal parasiteid Opius sp. (Braconidae) and flies also. for HaIficopteta circulus Walker (Piero­malidao) and Chrysocharts sp. (Eulephidee) in both seasons. The emerged flies species were L. (Scoriae at Damnhour and mainly L. ',swot-act with a small number of L. cicerina and L. saterao at Sids. The popula­tion growth rates of larval parasitolds were lower than those of flies, which retarded the biological control, particularly at the beginning of the season. To conserve and promote parasitoids pesticides must be entirely avoided. Also, the bio-effectiveness of the parasitoids Is Indicated by the decrease In emergence flies from diapausing pupae. It is noteworthy to suggest that some agricultural practices i.e. spreading the harvested plants on plastic sheets to facilitate collection of the accumulated pu­pae. deeply plowing and dropping kerosene at a rate of 30 literileddan = 4200 m² into water Irrigation can be used as sale and tactic control methods against pupae.