April 18. According to official website of Plant Protection College of Nanjing Agricultural University, as of March 27th, 2023, the re-examination time for doctoral students in Plant Protection College of Nanjing Agricultural University was April 18. The College of Plant Protection of Nanjing Agricultural University is a secondary college of Nanjing Agricultural University. The College of Plant Protection of Nanjing Agricultural University was established in 2000, starting with 1902 Pathology of Sanjiang Normal School.