The Role Of Plant Natural Products On Aphids Infesting Citrus Trees Of Sharkia Governorate

The aim here is a trial to relate between the susceptibility of different citrus varieties and their degree of infestation by aphids and their seasonal abundance ,crude plant extracts from several nonhost plants like :rue cardamom camphor canella ginger egyptian potato and pink were bioassayed in the laboratory extracts which have the advantage of being effective for killing aphids were applied under field conditions on citrus trees.