Mango (Mangifera indica L.) is grown commercially on a large scale across all tropical and subtropical lowland areas throughout the world. It is a good source of vitamin A and C, and is rich in carbohydrates, potassium and phosphorus. It isthe major fruit crop grown in Benshangul Gumuz Region of western Ethiopia for family consumption and markets. The production in the region is currently constrainted by infestation of white mango scale, Aulacaspis tubercularis Newstead. This research was conducted to assess damage status and evaluation of management options in Assosa and Bambasi from August 2018 to April 2019. Survey data of white mango scale infestation status and growers’ assessment collected from randomly selected of 7 kebele administrates of Amba_14, Amba_5, Amba_8 and Megele_32 from Assosa district and Mender_47, Mender_48 and Sonika from Bambasi district and 35 household with their respective mango orchards 5 per kebele administrates within 5 – 10 km interval. A well- structured questionnaire and face-to-face survey approach were used for assessment. Stratified sampling method was used for selecting 10 leaves per tree for 9 consecutive months; hence 90 leaves from each tree and 3150 sample leaves from 35 mango trees for counting the clusters of white mango scale insect pest for the study of infestation. Randomized complete block design (RCBD) was used for evaluation of Imidacloprid 20SL, Dimethoate 40%EC, White oil extract, Pruning, Imidacloprid 20SL + Pruning, Dimethoate 40%EC + Pruning and White oil extract + Pruning. The survey result showed that growers’ perceived that there was a heavy infestation of white mango scale insect pest which is a new pest and mainly dispersed by planting materials, due to unmanageable mango size nature and backyard farm production made management difficult which results a significant yield reduction. White mango scale insect pest infestation was significantly higher at Assosa than at Bambasi orchards and more abundant on upper leaf than on lower leaf surface. Infestation status was significantly varied among study months; lowest and highest record during December and April respectively. Temperature influence the infestation positively; a maximum record during maximum temperature of the study month April. High amount and continued rain fall and relative humidity influence infestation negatively. Optimum rain fall and relative humidity and also unmanaged mango orchards condition made the infestation serious. Experiment against white mango scale infested mango trees using Dimethoate 40%EC, white oil + pruning, Imidacloprid 20SL, and Dimethoate 40%EC + pruning treatments gave higher yield and statistically significant different from pruning and white oil treatments but their costs were such that they did not provide an acceptable rate of return. Imidacloprid 20 SL + pruning treatment was the most significantly effective which also provide a promising alternative cost to producers against white mango scale insect pest than other treatments.Therefore it is recommended to regular inspection and monitoring, develop a strong domestic quarantine, investigate resistance mango varieties and further screening of IPM compatible insecticide for providing sustainable management approach of white mango scales insect pest. Keywords: White mango scale, Mango orchard, Distribution, Abundance, Severity st