Novita, A., Merlyn Mariana, Windy Manullang, M. D. P. Sarumaha and Advent 2024. The Effectiveness of Beneficial Plants in Oil Palm (Elaeis guineensis Jacq.) Area in Reducing the Attack Rate of Oil Palm Leaf-Eating Caterpillar (oplec) at PT. Socfindo Mata Pao Gardens. Jurnal Online Pertanian Tropik. 10, 2 (Feb. 2024), 58-64. DOI:https://doi.org/10.32734/jopt.v10i2.12068.