الفهرس 
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Abstract
The present investigations were carried out in Assiut during the period from November 2018 to October 2019 to study some ecological aspects of insect pests inhabiting alfalfa and their associated natural enemies. In addition, laboratory studies were conducted to elucidate the
effect of constant temperatures on the development of Phytocoris sp. Results obtained could be summarizing as follows:
1- Ecological studies:
1.1- Survey of pests and their associated natural enemies (predators
and parasitoids) collected from alfalfa plants in AssiutA partial taxonomic list of pests and their natural enemies collected by sweep net from alfalfa plants in Assiut were presented. Results
indicated the presence of 31 species of arthropods belonged to 23 families
and 15 orders. from the species collected, 20 species were considered
pests causing damage, 11 beneficial arthropods as well as unidentified
species of true spiders.
1.1.1- Phytophagous insects
Intensive and extensive observations indicated that collected species
could be classified as sucking pests, leaf feeders, and leaf miners. In
general, of 8 orders (Orthoptera, Thysanoptera, Hemiptera-Heteroptera,
Hemiptera- Sternorrhyncha, Coleoptera, Lepidoptera, Diptera, Collembolla and Acarina) and 13 families(Gryllotalpidae, Agromyzidae, Curculionidae, Lygaediae, Miridae, Pentatomidae, Aleyrodidae,
Aphididae, Cicadellidae, Acridiidae, Noctuidae, Thripidae and Tetranychidae) were recorded inhabiting alfalfa plantations in Assiut.
Species belonging to order Lepidoptera were collected as larvae either by
sweeping net or direct observation on the plants and presented by family
of Noctuidae. Just two species were belonged to this order (Agrotis
ipsilon (L.) and Spodoptera littoralis (Boisd.). The leaf weevils, Hypera
93 brunneupennis Boheman (Curculionidae) was the only representative of
the order Coleoptera that collected by sweeping net method. Larvae and
adults of this insect were feeding on the alfalfa leaves. Also, two species
of order Orthoptera was recorded during the present study. These species
were the mole cricket, Gryllotalpa gryllotalpa L., (Gryllotalpidae) and
the grasshopper, Heteraacris (Thisoicetrus) littoralis (Rumb.)
(Acridiidar).