STUDIES ON PREDATORY INSECTS ATTACKING PURPLE AND FLORIDA RED SCALES ON ORANGE TREES. | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 2, Volume 27, Issue 2, February 2002, Page 1255-1264 PDF (4.3 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2002.253396 | ||||
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| Authors | ||||
| Laila A. Abd-Allah; A. L. Abd EI-Kareim; H. M. Fathy; S. A. Moustafa | ||||
| 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. | ||||
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