Scale insects (Coccoidae: Hemiptera) infested citrus trees and thier natural enemies, with a key of these pests in Egypt

Scale insects (Coccoidae: Hemiptera) are the most important pests infested
citrus trees in Egypt. The present work dealt with the scale insects infested citrus trees
and thier natural enemies as well as a key of these pests in Egypt . The results
indicated that seven species of scale insects were recorded infested citrus trees in
Egypt. Also taxonomic key of the seven species of scale insects was included. During
the present work the results indicated that the populations of red scale, Aonidiella
aurantii (Maskell) has two peaks one in April and the second one in October. In this
work two parasitoids recorded associated with red scale. Theses are Aphytis
lingnanensis Compere and Habrolepis aspidioti Compere and Annecke.It is recorded
here two peaks for each parasitoid in April and October for A. lingnanensis and in
July and November for H. aspidioti in Beni- Suef. Also this work indicated that citrus
wax scale, Ceroplastes floridensis Comstock has two peaks the first in May and the
second in October. In the present work two parasitoids recorded associated with
citrus wax scale. These are Metaphycus helvolus (Compere) and Microterus flavus
(Howard). It is recorded here two peaks for each parasitoid in May and October for
in Gharbiya .The present work observed , black scale Chrysomphalus aonidum (L.)
has two peaks the first in May and the second in November. In the present work two
parasitoids recorded associted with the black scale. These are Aphytis chrysomphali
(Mercet) and Encarsia citrina (Craw). It is recorded here two peaks for each
parasitoid in May and November in Qalyubyia. The present work recorded
seychellarum mealybug, Icerya seychellarum (Westwood) infested citurs trees in
Demmyat and has two annual peaks one in June and the other in November. Also here
Rodalia cardinalis Mulsant associated with seychellarum mealybug, I. seychellarum.
During the presnt work the results indicated that he purple scale, Lepidosaphes beckii
(Newman) has two peaks on citrus trees in Ismaillia . Also one parasitoid, Aphytis
lepidosaphes Compere and one predator Chilocorus bipustulatus L. were recorded.
During the present work the results indicated that parlatoria black scale, Parlatoria
ziziphi (Lucas) has two peaks on citrus trees in Cairo. Two parasitoids, A.
lingnanensis and E. citrina were recorded. During the presnt work the results
indicated that citrus mealybug, Planococcus citri (Risso) has two peaks on citrus trees
in Behira . Two parasitoids, Anagyrus pseudococci (Girault) and Leptomastix
dactylopii Howard .