The white mango scale insect, Aulacaspis tubercularis (Hemiptera: Diaspididae) is a recent threat to mango production in Ethiopia which was introduced in 2010. It has spread to all mango producing areas of the country within a short period of time reducing the production and quality of mangos. Control measures taken against the white mango scale include use of chemical insecticides, cultural practices and biological control using parasitoids and predators. Field experiments were conducted in western Ethiopia in two locations for two consecutive years in 2018 and 2019 to evaluate the efficacy of integrated application of a systemic soil drenching pesticide and tree management (pruning) for the control of the white mango scale. Randomized complete block designs with three replications were used for the experiments. The total number of WMS life stages varied significantly among the different treatments throughout the two years and application seasons at both Uke and Bako sites. At Uke Thiamethoxam 25% WG at 18g/tree + pruning treated trees showed the minimum mean number of WMS life stages per leaf (42.23) and (27.83) followed by Thiamethoxam 25% WG at 12g/tree + pruning treated trees (86.83) and (61.0) in the first and second application seasons respectively. Control trees showed highest (334.33) and (591.29) number of WMS life stages in the first and second application seasons respectively. Similar trends were observed at Bako. The study has shown that the integrated use of the systemic soil drenching insecticide and tree management can significantly reduce the WMS life stages on infested mango trees indicating that it is a promising approach to the control of the WMS. Integration of these approach with other management components such as biological control agents and the effect of the systemic insecticide on the content of the edible fruit deserves further study
