Survey of cereal aphids and their natural enemies and effect of the predator Coccinella septempunctata L. on biological suppression of cereal aphids in Al-Jabal Al-Akhdar region, Libya

El Aish, H.S.; El Ghariani, I.M.; Al Mabruk, A.H.H.

Egyptian Journal of Biological Pest Control 14(1): 285-290

2004


ISSN/ISBN: 1110-1768
Accession: 004337454

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Abstract
A study was conducted to survey and identify the cereal aphid species and their natural enemies in Al-Jabal Al-Akhdar region, Libya. The results revealed the presence of three species from cereal aphids: Rhopalosiphum padi, Schizaphis graminum and Sitobion avenae. The aphid species showed different appearance and distribution in different locations of the area of the study. The following natural enemies were registered: the predators Coccinella septempunctata and Chrysoperla carnea, and the parasitoids Aphidius matricariae and Diaeretiella rapae. The study on the efficiency of C. septempunctata for suppressing cereal aphids showed that the durations for the egg lasted 2-3 days and 3, 2, 2 and 4 days for 1st, 2nd, 3rd and 4th instar larvae, respectively, and 8 days for the pupal stage at the room temperature. In addition, the results proved that the predator adult consumed 46.13 aphids, while the larva consumed 26.9 daily. The predation efficiency of the predator C. septempunctata was significantly different between larvae and adults.