VIRULENCE ASSESSMENT OF BROWN PLANTHOPPER POPULATIONS IN ALLUVIAL SOIL REGIONS OF THE MEKONG DELTA

Abstract

The experiment was conducted under a nethouse condition at the Cuu Long delta Rice Research Institute (CLRRI) in 2024. The study was conducted on 11 rice genotype differentials and 1 rice variety (susceptible check), along with eight BPH populations. The results showed that 8 BPH populations in alluvial soil regions of An Giang, Kien Giang, Hau Giang, Can Tho, Dong Thap, Soc Trang, Tien Giang and Long An provinces/city did not have any difference in damage levels on all eleven rice varieties carrying control resistance genes. Among eight BPH populations in the alluvial soil ecological areas of the Mekong delta, the virulence of the BPH population in Dong Thap province has the strongest damage level. In addition, out of eleven rice varieties, only Ptb33 rice variety carrying multiple resistance genes (bph2, Bph3 and Bph32) revealed moderate resistance to eight BPH populations, in case of Rathu Heenati (Bph3 and Bph17) had moderate resistance to 3 per 8 BPH populations (three provinces: Soc Trang, Tien Giang and Long An), Swanalata (Bph6) had moderate resistance to 3 per 8 BPH populations (three provinces: An Giang, Tien Giang and Long An) and IR54742 (Bph10) had moderate resistance to 1 per 8 BPH populations (Kien Giang province). In summary, the findings of this study may support rice breeding efforts and play a crucial role in developing new rice varieties that reveal good resistance to severe impacts of BPH populations in the Mekong delta regions.