Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2002.452.454GillaniWaseem AhmadBashirTariq IlyasMohammad 4200254The population dynamics of fruit flies was studied in guava and nectrin orchards at National Agricultural Research Centre, Islamabad, Pakistan, using pheromone traps baited with a mixture of methyl eugenol, sugar and naled. Generally, flies were caught in higher numbers in nectrin orchard than in guava orchard, however, the difference was not statistically significant. The fruit flies were present in the field throughout the year except January. They were caught in the traps in greater numbers from May to August and their population was at the peak in July in both guava (80.66 males/trap/week) and nectrin (168.66 males/trap/week) orchards. Three species, Dacus zonatus (Saunders), Dacus dorsalis Hendel and Dacus cucurbitae Coquillett were caught in the traps. Dacus zonatus was the dominant species and its population was significantly higher (F = 5.73, df = 2, P = 0.0073) than other two species. It appears to be a severe pest of these fruits as it was present in the field almost through out the year and in greater numbers in the warmer half of the year. Dacus cucurbitae was caught in the traps in very small numbers and this species does not seem to be a serious pest of guava and nectrin under Islamabad ecological conditions.]]>Ali, I., F. Ullah and S.A. Khan,1999Bactrocera spp.).]]>15589594Alyokhin, A.V., R.H. Messing and J.J. Duan,200093644649Anonymous,1978Dacus cucurbitae Coquillett distribution maps of pests.]]>1978Bhagat, K.C., V.K. Koul and R.K. Nehru,1998Dacus cucurbitae Coquillett.]]>195556Dashad, S.S. and O.P. Chaudhary Rakesh,199917333335Dominiak, B.C., M. Cagnacci, T. Rafferty and I. Barchia,1998Bactrocera tryoni (Froggatt).]]>286571Jacobson, M.,1972pp: 382pp: 382Kabir, S.M.H., R. Rahman and M.A.S. Molla,1997Dacus (Zeugodacus) tau walker (Tephritidae: Diptera).]]>25115120Kapoor, V.C.,19704207251Makhmoor, H.D. and S.T. Singh,1998Dacus dorsalis hendel in guava orchard.]]>6165169Makhmoor, H.D. and S.T. Singh,1999Dacus dorsalis hendel.]]>73336Marwat, N.K.,1986Marwat, N.K. and U.K. Baloch,19867234236Purnima, S., S.K. Saxena and P. Sinha,1999Dacus cucurbitae Coq.]]>79699Qureshi, Z.A., A.R. Bughio, Q.H. Siddiqui and Najeebullah,1976Dacus zonatus (Saunders) (Diptera: Tephritidae).]]>192223Saikia, D.K. and S.K. Dutta,1997Dacus tau (Walker) on ridge gourd, Luffa acutangula L.]]>10132135Syed, R.A.,1971V. Dacus cucurbitae Coquillet.]]>145375Syed, R.A., M.A. Ghani and M. Murtaza,197013116