الفهرس Only 14 pages are availabe for public view
 |  | from | 198 |  |  |
| | | from | 198 | | |
Abstract
The olive psylla, Euphyllura straminea Log. (Homoptera-
Aphalaridae) and the olive leaf moth, Palpita unionalis (Hb.)
(Lepidoptera - Pyralidae) are important pests of olive trees.
causing much damage in orchards.
Ecological studies on E. straminea and its parasitoid
Psyllaephagus euphyllurae were carried out during two
successive seasons (November 1992-June 1994) in an orchard
containing unsprayed olive trees at lsmailia governorate.
Fluctuation of E. straininea population on olive trees showed
two peaks. The first peak occurred during the first two weeks of
January. while the second was during the first two weeks of
April in the two successive seasons. Studying the population of
Estraminea at different olive tree levels showed that the greatest
highest numbers of immature stages occurred at the medium
level, followed by the lower level and then the upper level.
Three hymenopterous parasitoids were recorded from
samples of E. straminea collected during the study period. i.e.
one primary parasitoid.i.e. Psyllaephagus euphyllurae Silv.
(Hymcnoptcra-Encyrtidac), parasitizing the s” instar nymphs of
E. straminea.zsvs two secondary parasitoids.i.e. Pachyneuron
inuscarum L. (Hymenoptera- Pteromalidae) and Marietta picta
Andre. (Hymenoptera- Aphelinidac). Percentage of parasitism
by P.euph,vllllrue under field conditions had been estimated.
The data indicated that in the first season of investigation. the
total percentage of parasitism reached its peak of (83.2 (Yo)
during the first half of May, while in the second season, it
reached its maximum (79.7 %) in the second half of April.
Percentage of hyperparasitism under field conditions had been
studied also.