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4. Ahmed, M. A. (2005). Recommendation of four systemic insecticides for control of the green date palm pit scale insect (Asterolecanium phoenicis Rao.) (Homoptera: Asterolecaniidae), using two method of application. In Proceedings of 67th meeting of the Pests and Diseases Committee. ARC Conference Hall, Wad Medani, Sudan, June 2002.
5. Ahmed, M. A. (2007). The efficacy of chlorpyrifos 480 EC as a contact insecticide against the green date palm pit scale insect (Asterolecanium phoenicis Rao.) (Palmapsis phoenicis) (Homoptera: Asterolecaniidae) in Northern Sudan. Progress Report, submitted to Plant Protection Research Centre Agricultural Research Corporation ARC, Sudan. November 2007.