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Onion wood is one of the commodity timber which is widely used as carpentry wood and furniture by the people of Bengkulu. Mealy bug is a pest that attacks onion wood. The purpose of this study was to evaluate the attack of mealy bug pests on onion wood plants in the forest of the campus university of Bengkulu. The study was conducted with a purposive sampling survey, sampling plants, consisting of the nursery, sapling, pole and tree phases. The results showed that mealy bug can attack all phases of onion wood growth, namely from the seedling, sapling, pole and tree phases. The population of mealy bug is highest in the pole phase, compared to other phases and the dominant mealy bug are found in the leaves. Natural enemies was found predators of the Order Neuroptera: Chrysopidae, and mites. This information is expected to be a reference in developing strategies to control mealy bug pests on onion wood plants.