Recently, the
pear psylla, Cacopsylla
pyricola (Förster) (Hemiptera : Psyllidae) and the olive scale insect, Parlatoria oleae
(Colvee) (Hemiptera: Diaspididae) are the most important pests on pear trees in
different locations in Egypt. The main purpose of this investigation is to
investigate  the effect of  some different natural control compounds on the pear psylla, the olive scale and their
natural enemies on pear trees in
Ismailia and Gharbia Governorates throughout May and October 2013-2014,
respectively. In the first season results indicated
that, ,the four compounds (Jojoba oil, Peacilomyces
fumosoroseus, Azadrachtin and Verticellium lecanii) gave moderate
toxic effect against C. pyricola  population nymphs and its predator, Orius laevigatus (Fieber) (Hemiptera: Anthocoridae). Mineral oil and Sulphur compounds gave 78.6% and 74.9 % and 70.3 % and
66.9 %of C. pyricola  populations nymphs  and
its  predator, O. laevigatus, respectively. On the other hand, Malathion gave high efficacy against nymphs of 
C. pyricola (88.0%) and its predator, O. laevigatus  (82.5%). 
In the second
season,  the results indicated the same
trend to which obtained in the first year. While, in the first season,  for  P. oleae
populations and its parasitoid, Aphytis lingnanensis Compere (Hymenoptera:Aphelinidae) the  results indicated that, the above mentioned
gave moderate toxic effect . Mineral oil and Sulphur compounds gave 77.7 %
& 73.9% and 70.2 % and 66.2 %% of P.
oleae populations and its parasitoid, A. lingnanensis, respectively. While, Malathion gave high efficacy against P.
oleae populations (87.0%) and
its parasitoid,  A.
lingnanensis  (82.9%) . In the second
season,  the results indicated that the
same trend to the first year. It could concluded
that treatments with Jojoba oil , P. fumosoroseus,
Azadrachtin and V. lecanii
gave moderate effect of the pear psylla
and the olive scale and their natural enemies (parasitoid and predator), when
comparing with Mineral oil, Sulphur and Malathion. This conclusion will be help in integrated
pest management program of the two pests infested pear in Gharbia and Ismailia, Governorates.