Tricahyati, T., Suparman, S., Arsi, A., Hamidson, H., Pujiastuti, Y., Azhari, S.,Apriyansah, Erlangga, E., Agustin, H. M. (2025). Population of Aphis gossypii (Hemiptera: Aphididae) on Chili Pepper Crops in South Sumatera Province. In: Herlinda S et al. (Eds.), Prosiding Seminar Nasional Lahan Suboptimal ke-13 Tahun 2025, Palembangg 20 Oktober 2025. (pp. x–y). Palembang: Penerbit & Percetakan Universitas Sriwijaya (UNSRI).Chili pepper plants (Capsicum annuum L.) have high demand in both local and international markets, contributing to economic stability and food security. However, chili cultivation faces challenges such as climate change and pests. Chili production in Indonesia has experienced a drastic decline, caused by the infestation of the Aphis gossypii pest, which is resistant to insecticides and can cause losses of up to 90% as a disease vector. Therefore, this study aimed to identify the Aphis gossypii population on chili plants, the factors influencing it, and the intensity and incidence of Aphis gossypii attacks in South Sumatra Province. This research was conducted on several chili farming lands in South Sumatra Province. Data collection was carried out by selecting land using the purposive sampling method, then simple random sampling was used when taking samples from the chili fields by randomly selecting 5 ridges and then observing 10 plants from each ridge, resulting in a total of 50 plants observed from each chili field. The results of research conducted in four cities or districts, namely Palembang City, Prabumulih, Musi Banyuasin Regency, and Muara Enim, in South Sumatra Province, found a populationpii) totaling 2949 individuals. Aphid attacks cause chili plants to become paler, with leaves curling, yellowing, wilting, and shrinking. The intensity obtained was mild, between 7.5% and 21.5%. The incidence of attacks was mostly low, with 14-36%. This could be due to the abundant food available for aphid pests.