Response of different rice genotypes against rice root-knot nematode, Meloidogyne graminicola under screen house condition

The present study was carried out in screen house of the Department of Nematology, CCS Haryana Agricultural University, Hisar during kharif season, 2023. In present investigations, 46 rice genotypes (basmati & non-basmati) evaluated under DSR condition against M. graminicola. Seeds of each genotype were sown in the earthen pots (2 kg soil capacity) containing steam sterilized sandy loam soil and inoculated with freshly hatched second stage juveniles of M. graminicola @ 2000 J2/pot. Forty-five days after inoculation, observations were recorded on various nematode multiplication parameters. The result clearly revealed that all the genotypes showed varying degree of reaction against M. graminicola. Among basmati (22) group seven genotypes (Noori-Bas, HB-1, PB-1718, PB-1885, PB-1637, HKR-03-408, CSR-90) moderately resistant reaction against M. graminicola. Minimum number of galls and eggmasses were obtained in PB-1718, PB-1885, HKR-03-408 having 29 &23, 34.67 & 23.67 and 33 & 23.67, respectively. Among non-basmati (24) group two genotypes (PR-130 and PR-106) showed resistant and eight (HKR-127, HKR-18-24, ASP-407, Jaya, HKR-16-1, IR-64, HKR-17-33, HKR-16-35) genotypes were moderately resistant against M. graminicola. Minimum number of galls and eggmasses were obtained in PR-130 and PR-106 having 31.67 &19.67 and 29.67 &19.67, respectively. Maximum number of galls & eggmasses/plant was observed in Pusa 1121 (102.33 & 82.67). Remaining genotypes were either susceptible or highly susceptible reaction against M. graminicola including local susceptible check (Pusa 1121).