Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2004.130.133Adonia variegata Goeze]]>Al-DoghairiMohammed A.AL-RehiayaniSuloiman OsmanKhaled A.ElhagEltayeb A.2200472A variety of pesticides is used in alfalfa field to control pests. Biological control agents are also used
to control these pests, therefore it is important to understand the effects of such pesticides on these beneficial
insects. The present study was carried out to examine the residual effects of Dursban and Fenvalerate as
conventional pesticides as well as Bio-Fly and Bio-Neem as biorational pesticides on ladybird beetle, Adonia variegata Goeze using panel exposure technique. Dursban was highly toxic to ladybird beetles at ½, 1 and 2
folds of the recommended dosages, where mortality percentages ranging from 46.7-50, 50 and 55-55.33%,
respectively during the period of 1-120 h. Fenvalerate produced moderate toxic effects on the coccinellids,
where mortality percentages were 10-47.7, 20-50 and 13.33-50% following the residual exposure of ½, 1 and 2
folds of the recommended dosages. On the other hand, the biorational pesticides Bio-Neem and Bio-Fly showed
slight toxicity of a maximum of 10% mortality, produced after 5-day exposure of their recommended and half the
recommended dosages. When the dose was doubled the toxicity of Bio-Fly did not increase, however, that of
Bio-Neem reached 26.7 after 5 days. It can be concluded that in IPM programs, the application of conventional
pesticides must be considered carefully for use, whereas biorational pesticides can be used with natural enemies
with minimum effects.]]>Bartlett, B.R.,195346565569Elhag, E.A.,199238425430El-Hag, E.A. and A.A. Ahmed,1992276873Elhag, E.T.A. and A.A. Zaitoon,19967316319El-Hag, E.A., F.M. Harraz, A.A. Zaytoon and A.K. Salama,19968135145Mordue, A.J. and A. Blackwell,199339903924Miller, F. and S. Uetz,19988185192Qi, B., G. Gordon and W. Gimme,2001Harmonia conformis (Boisduval) (Coleoptera: Coccinellidae) and Mallada signatus (Schneider) (Neuroptera: Chrysopidae).]]>22185190Smith, S.F. and V.A. Krischik,200093732736Thomas, C.F.G., E.H.A. Hol and J.W. Everts,19904357368Yardim, E.N. and C.A. Edwards,1998703148Youn, Y.N., M.J. Seo, J.G. Shin, C. Jang and Y.M. Yu,2003Harmoni axyridis (Coleoptera: Coccinellidae).]]>28164170Al-Doghairi, M.A.,20032003Steiner, M.Y. and D.P. Elliot,1987Stauffer, S. and M. Rose,19971997pp: 183-205pp: 183-205Osman, K.A. and S. Al-Rehiayani,20031081106Roger, C., D. Coderre and C. Vincent,19911991pp: 329-336pp: 329-336Jepson, P.C.,19891989pp: 95-128pp: 95-128Theiling, K.M. and B.A. Croft,198821191218