THE EFFECT OF INTEGRATED AND CONVENTIONAL PEST CONTROL ON DIFFERENT APHID AND COCCINELLID POPULATIONS IN AN APPLE ORCHARD IN HUNGARY

Authors:	A. Haltrich, V. Markó
Abstract: Experiments were carried out on aphid and coccinellid populations of an experimental apple orchard in Hungary in 1993. The orchard was divided into two different treated plots: conventional protected and IPM-plots. The samplings were taken weekly from April till October. The most important aphid species wich were found on apple were: the green apple aphid /Aphis pomi/, rosy leaf-curling aphid /Dysaphis devecta/ and rosy-apple-aphid /Dysaphis plantaginea/. The density of Dysaphis devecta populations increased in the IPM - plot, their numbers were year by year higher. The Aphis pomi was in whole vegetation period present in the orchard in every plot. In July, on some trees their number was so high, that appeared red sucking-points on the fruits. The most important aphidophagous Coccinellidae species were Coccinella septempunctata and Hippodamia variegata. Between the plots the species richness of aphidophagous Coccinellidae assemblages was similar (N_IPM=6, N_COM=7), but the density of assemblage in IPM plot was three time higher (n_IPM=173, n_COM=60).
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