Ecological Studies on Lepidosaphes ulmi (L.) (Hemiptera: Diaspididae) and its Parasitoids on Olive Trees in Middle Egypt | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 2, Volume 14, Issue 5, May 2023, Page 121-124 PDF (893.74 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2023.205335.1141 | ||||
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| Authors | ||||
Halima M. Ibrahim 1; A. M. Salleh2; Heba A. S. Elelimy  3
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| 1Biological Control Research Department, Plant Protection Research Institute, Egypt | ||||
| 2Department research of agricultural Operation Mechanization System, Agricultural Engineering Research Institute, Egypt | ||||
| 3Entomology Department, Faculty of Science, Cairo University, Giza, Egypt. | ||||
| Abstract | ||||
| The oystershell scale insect, Lepidosaphes ulmi (L.) is considered one of the serious pests attacking olive trees in Egypt. The present study was carried out in Naser region, Beni-Suef Governorate during two successive years (2021 and 2022). The population fluctuation of the oystershell scale showed two to three peaks that were recorded during the spring, summer and autumn seasons during the years of study. The highest population peak was recorded in summer (11 and 15.6 insects/leaf, through 2021 and 2022, respectively). While the percentage of parasitism showed 4-5 peaks annually. The factors of minimum and maximum temperatures, relative humidity, and parasitism had non-significant effect on population density of L. ulmi in 2021 season, but had highly significant effect in 2022 season. However, these ecological factors had significant effects on the parasitism rates in both years of study.The parasitoids, Aphytis chrysomphali and A. diaspidis (Hymenoptera: Aphelinidae) were collected from L. ulmi scales. | ||||
| Keywords | ||||
| Population fluctuation; Lepidosaphes ulmi; parasitoids; weather factors | ||||
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