STUDIES ON PREDATORY INSECTS ATTACKING PURPLE AND FLORIDA RED SCALES ON ORANGE TREES.

Document Type : Original Article

Authors

Econ. Entomol. Dept., Fac. of Agric., Mansoura Univ.

Abstract

The efficiency of predator insects of the diaspidid species, Lep < /em>idosaphes
beckii New and Chrysompha/us aonidum populations (Linn.) was evaluated on
orange trees during the two SIJC~eSS!ve seasons 1996/1997 and 1997/1998.
During the course of study, five predators were found associated with the
purple scale, L. beckii and Florida red scale, Ch. aonidum populations on the infested
orange leaves. Chi/ocorus bipustu/atus was the main dominant predator, it had two
peaks of abundance on May and October, while the other predators showed two
peaks of abundance in spring and autumn in both years of study.
Predators attacking L. beckii recorded three periods of activity annually in
spring, summer and autumn, respectively. The lowest activity period was in winter.
The percentage of predation all over the year was 9.S±3.6 and 10.6±4.0% for the first
and second year, respectively. Meanwhile, it showed two periods of activity on C.
aonidum during spring and autumn. The percentage of predation allover the year
was 9.3±3.0 and 9.4±3.S% for the first and second year, respectively.
Ch. bipustu/atus adults showing relatively higher searching rate in comparison
with C. undecimpunctata under laboratory and field conditions. In addition to C.
undecimp < /em>unctata exhibited relatively higher matual interference values than Ch.
bip < /em>ustu/atus.
Journal of Plant Protection and Pathology
Volume 27, Issue 2
February 2002
Pages 1255-1264

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