الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Potato crop (Solanum tuberosum) is one of the most important vegetables
cultivated in Egypt. This crop is growing in more than one season all over the year that allows the plants to be attacked by numerous insect pests specially, aphids. So,it is
necessary to study the population density of aphid species and their natural enemies under dominant weather conditions and trying to use biological control instead of chemical insecticides, which have negative effects on environment..
The obtained results could be illustrated briefly as follows:-
1. Survey of aphid species and their natural enemies on different potato varieties at different regions:
Aphid species and their natural enemies (pradators and parasitoids) were collected and identified in 2019, 2020 and 2021 in different potato fields in different regions at Alexandria and El Behira governorates.
Four aphid species (Myzus persicae, Aphis gossypii, Aphis craccivora and Aphis citricola) belonging to (Hemiptera: Aphididae) were found. In addition, the natural enemies
associated with the four species of aphid were seven parasitoid species (Diaeretiella rapae, Aphelinus sp, Aphidius ervi, Aphidius colemani, Lysiphleus sp and hyper parasitoid
Asaphes sp, Alloxista sp) represented six genera belonging to four families,(Braconidae and Aphellinidae (which include primary parasitoids)Pteromalidae and Cynipidae (which include hyper parasitoids) according to order (Hymenoptera). Nine predatory insect species
(Chrysoperla carnea, Ebisyrphus beltateus, Coccinella undecimpunctata, Coccinella
septempunctata, Cheilomenes sexmaculata var isis, Cheilomenes sexmaculata var Nilotica, Scymnus syriacus, Orchus chaleubus Cryptolemus montrouzieri and Aphidoletes aphidimyza) representing seven genera, belonging to four families following four orders were collected and recovered from potato plants. Also, a few numbers of true spiders were
found preying on aphid colonies.