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Abstract

Field and laboratory studies were conducted in the south Baghdad aiming at determining population dynamics and the host preference of Aonidiella orientalis on citrus four cultivars (Lemon Citrus limon, Bergamot C. auranitum, Mandarin C. reticulata and Orange C. sinensis), Throughout the season 2002. Results showed that the numerical density on fruits more than leaves (20.4, 6.0 insects/cm² respectively), The lemon fruits were the most susceptible cultivar to the infestation by A. orientalis, while the mandarin leaves were most susceptible cultivar than other cultivars. The results indicated that lower parts of citrus tree were best preferred than mid and upper part to the A. orientalis 10.0, 7.6 and 0.51 insects/cm² of leaves respectively and 31.8, 28.3 and 0.96 insect per cm² fruit respectively. In general, the inside part and outside part of citrus tree were found to be nearly similarly susceptible to A. oreintalis. We recorded the presence of Chilocorus bipustalatus L. as a predator to this pest, The results of this study can be used in the practical application of biological and chemical control to this pest..

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