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  • Author or Editor: S. Abd-Rabou x
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The silver leaf whitefly,Bemisia tabaci biotype „B ”(Homoptera:Aleyrodidae)is one of the most serious vegetable and ornamental plants pest in Egypt.Predators play an important role in controlling this species. The present work deals with the abundance of indigenous predators in greenhouse on three host plants mostly of vegetable crops during April –July,1996.Chrysoperla carnea (Stephens)(Neuropteran: Chrysopidae)is considered the most abundant predator acting on Bemisia. In the meantime,the work deals also with the potential of the imported predators,namely Delphastus pusillus Le Conte (Coleoptera:Coccinellidae)and Macrophillus caliginosus (Wagner)(Hemip- tera :Miridae).These predators were released 3 times on eggplant (Solanum melongena)and at the ratio of 1 individual and 2 individuals/plant for D.pusillus and M.caliginosus,respectively.Results indicate that predators increased in numbers while whitefly population decreased in comparison to control homologues. Biotype B.tabaci was identified in John Innes Center,UK and recorded by Abd-Rabou (1999) in Egypt as first recorded for presence of this biotype.

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A synopsis of the species of Aphytis occurring in Egypt and comprising nine newly recorded species being A. chilensis Howard, A. hispanicus (Mercet), A. paramaculicornis DeBach and Rosen, A. vandenboschi DeBach and Rosen, A. philippinensis DeBach and Rosen, A. africanus Quednau, A. lingnanensis Compere,  A. phoenicis DeBach and Rosen, A. aonidiae (Mercet) and A. libanicus Traboulsi. A key is given to these species.

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Eretmocerus siphonini Viggiani and Battaglia is one of parasitoids that showed a promising trend towards control of some whitefly species. The classical biological control of Siphoninus phillyreae (Haliday) (Homop­te­ra: Aleyrodidae) and Aleurolobus niloticus Priesner and Hosny (Homop­te­ra: Aleyrodidae) was achieved through mass rearing and releasing of E. siphonini in three governorates in Egypt during 1998-1999. A total of 237,020 parasitoids were reared and released in Assiut, Giza and Sharqiya governorates. The rate of parasitism increased from 5 to 60% and from 21 to 65% during 1999-2000, respectively, in Assiut. In Giza governorate, the increase amounted 2 to 46 and 10 to 67% on S. phillyreae on pome­gra­nate plant. Accordingly, E. siphonini showed that, it is an effective parasitoid legible for control of this whitefly. Similarly, the parasitism rates of E. siphonini increased (from 8 to 67% and 12 to 73 in Assiut and from 14 to 76 and 27 to 70% in Sharqiya) after releasing of the parasitoids on A. niloticus on ziziphus plants which showed the important role of this parasitoid in Egypt.

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Species of the family Aphelinidae (Hymenoptera: Chalcidoidea) comprise many of the most widely used and successful entomophagous biological control agents. An annotated list of the 11 genera and 81 species of the family Aphelinidae known to occur in Egypt and a key to genera of Aphelinidae in Egypt are provided.

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In recent years, Aleuroclava psidii (Singh) (Hemiptera: Aleyrodidae) has been extending its geographic range due to the international movement of plant material. In October 2013, it was discovered on Psidium sp. (Myrtaceae) in Egypt and represents the first record of this species in Egypt and the Western Palearctic region.

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Recently, the senior author discovered the presence of a whitefly on sugarcane, Saccharum officinalis , in Qena, Egypt, and sent specimens to the junior author who identified it as Bemisia formosana Takahashi (Homoptera: Alyerodidae). Since this is the first report of this species occurring on sugarcane, an economic crop, and the first distribution record of it occurring in Egypt and the Mediterranean region, we thought it expedient to publicize the information to alert workers in the region to its presence.

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Three new species of Eretmocerus Haldeman, E. persiangulfus sp. n., E. aleuroviggianus sp. n. and E. hederae sp. n. are described and illustrated as well as the Iranian species list of the genus Eretmocerus is presented.

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The family Encyrtidae is one of the largest families among the Chalcidoidea with over 3000 nominal species known throughout the world of which thirty-eight have been recorded in Egypt (Abd-Rabou, 2006). It represents the largest group of natural enemies of soft scales (Coccidae: Hemiptera) with several hundred species in 45 genera. Prinsloo (1997) provided an excellent review and key to the genera of encyrtids associated with soft scale insects. The following represents the results of a survey of encyrtid parasitoids associated with scale insects in Egypt (Hemiptera: Cocciodea) conducted in 2009.

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An annotated list of 68 species in 35 genera of encyrtids known to occur in Egypt with their insect or plant hosts and distribution is provided.

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The present work deals with Encarsia and Eretmocerus species — groups. A keys to the Encarsia and Eretmocerus species — groups are given. A list of Eretmocerus and Encarsia species — groups (Tables 1, 2) and the specialists of Encarsia and Eretmocerus of the world are provided.

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