Synergistic effects of biochar and PGPR in enhancing the efficacy of biological control agents against Ganoderma boninense in oil palm (Elaeis guineensis L.): a critical review - Qudrat Ullah; Muhammad Zeshan; Waqas Haider; Muhammad Waqar; Zaki ul Zaman Asam; Muhammad Zubair; Mujahid Farid (Archives of Microbiology, 2026)