Due to Economic importance and great landscape of citrus trees in Egypt and all Countries of the world. Citrus trees are affected by numerous species of insects pests, mites, and disease pathogens that infest the leaves, flowers, bark, fruits, and branches of citrus which causes losses of yeild. The most common sucking pests attack citrus are aphids, mealy bugs, scales insects and mites. These pests feed on the sweet sap by inserting a needle-like sucking tube into the plant and drawing out the juice. After the sap has been used by the insects, it is excreted as honeydew, which forms the base on which a black fungus(sooty mould) which reduces photosynthesis and discolours affected fruits.So the study was determined the recent status of insect pests infest the citrus trees ( Baladi and Navel Orange) at Qalyubiyah governorate, Egypt.Thirteen insects pests species were found. They werebelonging to families:Aphididae,Coccidae,Margarodidae ,Diaspididae, Anthomyi, Aleyrodidae,ThripidaeandDrosophilidae. green aphid Aphis gossypi were the most common pest attacking citrus trees(76.53 &71.1% ) on both baladi and navel orange of total collected pests, . Its peak of abundance was between March and first week of April followed by significant numbers of leaf miner Pegomyiahyasayami 15.6& 19.8 %),and scale insectsIceryaeseychelarum( 2.09& 2.16%), AonidellaOrientalis (1.6 & 1.94 %),ParlatoriaZizphus (1.3 & 1.7%)Ceratoplastesfloridensis ( 0.7& 1.29% ),Ceratoplastesrusci (0.4 & 0.43 ), Iceryaepruchasi ( 0.41& 0.43 ), Bemisiatabacii (0.69 &0.43%), Coccushespereidum.( 0.0&0.43 % ), a Thrips sp., its numbers were few in comparative with other pests collected leaves while its scarring on the fruits were found) and Drosophilla sp. (0.0 &0.2 ) ,which were found in most months of the year. The natural enemies Of citrus pests species were belonging to these taxonomic groups :Neuroptera, Hemiptera and Coleoptera, Hymenoptera and Acari.
AYda.momtaz@fsc.bu.edu.eg
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