Nandal, S.N.Ram Sharan2016-11-192016-11-192008http://krishikosh.egranth.ac.in/handle/1/86482An abstract of thesis submitted to the Chaudhary Charan Singh Haryana Agricultural University in the partial fulfillment of the requirements for the degree of M. Sc. (Ag.) in Nematology). An extensive survey was conducted for the prevalence of Meloidogyne graminicola in the Karnal, Panipat and Sonepat districts of Haryana. The results revealed that all the rice nurseries of these districts were infected with M. graminicola. Maximum occurrence (71.4%) was found in Sonepat district, while in Panipat and Karnal districts 50% and 34.2% rice nurseries, respectively were found infected. An intensive survey was conducted in the rice nurseries of fourteen villages of Kharkhauda block of Sonepat district for the prevalence of M. graminicola. All the rice nurseries in these villages were found infected with this nematode. Frequency of occurrence was recorded to be 62.5% of this nematode in Kharkhauda block. The effect of rhizobacteria, namely Azotobacter chroococcum (103, MSX-9, HT-54 and BNR-6), Gluconacetobacter diazotrophicus (CO 99-70, 35-47 and 760-50), Bacillus spp. (91 and 65), Pseudomonas fluorescens and P. maltophila was studied in rice in naturally infested soil with M. graminicola under green house conditions. The results showed that all the rhizobacterial strains except (A. chroococcum strain 103) significantly increased the plant height and weight and reduced the number of galls/plant and nematode over untreated check. Maximum plant height (6.75cm) was recorded in G. diazotrophicus strain 760-50 and Bacillus spp. 91. Similarly, maximum plant weight 0.83g and 0.93g was recorded in both treatments, respectively. However, maximum reduction of nematode population (0.5 and 0.6 times) was observed in G. diazotrophicus strain 760-50 and A. chroococcum strain BNR-6, respectively over untreated check (1.5). The effect of oil cakes of neem and mustard, and leaves of neem and calotropis each @ 1% and 2% w/w as soil application was studied on rice infected with M. graminicola in pots. The results showed that all treatments significantly increased the plant height, weight and reduced number of galls/plant and nematode population of M. graminicola over untreated check except neem cake @ 1% dose. Amongst various plant products, maximum height (9.75 cm) and weight (1.82g) was recorded in mustard cake @ 2%. Similarly, minimum gall numbers (3.25/plant) and maximum reduction (0.4 times) in nematode multiplication was recorded in mustard cake @ 2% dose.enRice, Planting, Biological phenomena, Meloidogyne graminicola, Bacteria, Vegetative propagation, Sowing, Biological development, Diseases, MustardThesis