Ecological Management of Insect Pests in Rice (Oryza sativa L.) Using Refugia Plants and Biopesticides: A Case Study in Northern Sumatera, IndonesiaAmeilia Zuliyanti Siregar, Ravindra C. Joshi, Liana Dwi Sri Hastuti and Nismah PanjaitanBIO Web Conf., 189 (2025) 01004DOI: https://doi.org/10.1051/bioconf/202518901004