Response of rice genotypes against rice root-knot nematode, Meloidogyne graminicola

Abstract

The rice root-knot nematode, Meloidogyne graminicola is one of the major nematode pest and cause 17-30% yield losses in rice crop. The huge loss caused by M. graminicola can be reduced by using the number of management practices, but chemical method is most popular and commonly used by farmer. Due to indiscriminate use of chemical pesticides for management of M. graminicola enhance the problem of resistance and risk to the environment, so there is current need of the adoption of various eco-friendly management approaches among which resistant cultivars is a low cost, long term and sustainable option for the management of plant parasitic nematodes. In present investigations, 15 rice genotypes were evaluated for resistant against M. graminicola under screen house conditions, in the Department of Nematology, CCS HAU, Hisar during Kharif 2023. 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 @ 3000 J2/pot. Forty-five days after inoculation, observations were recorded on number of galls and eggs masses/plant. The result clearly revealed that all the genotypes showed varying degree of reaction against M. graminicola. Out of fifteen rice genotypes, three genotypes (CSR-90, HKR 16-1 and PR-106) showed moderately resistant reaction against rice root-knot nematode. Remaining genotypes were either susceptible or highly susceptible reaction against M. graminicola.