Population development and management of rice root-knot nematode, Meloidogyne graminicola in rice
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Date
2021-09
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CCSHAU, Hisar
Abstract
Investigation was carried out on “Population development and management of rice root-knot nematode, Meloidogyne graminicola in rice”. In population development on different soil-types, growth parameter of rice and population development of M. graminicola was studied in four different types of soil viz., sandy loam, loamy sand, clay loam and sandy soil. Maximum and significantly higher growth parameters of rice was observed in clay loam soil followed by loamy sand, sandy loam and sandy soil. Nematode multiplication and reproduction was significantly highest in sandy soil followed by sandy loam, loamy sand and clay loam. In different water regimes experiment, growth parameter of rice and population development of M. graminicola was studied in four different water regimes viz., irrigation after 24 hours, irrigation on alternate days, flooded and saturated. Maximum and significantly higher growth parameters of rice was recorded in flooded condition followed by saturated condition, irrigation after 24 hours and irrigation on alternate day. Nematode multiplication and reproduction was significantly highest in irrigation on alternate day followed by irrigation after 24 hours, saturated condition and flooded condition. For screening, out of 47 genotypes of rice were screened, four genotypes (HKR 09-189, HKR 09-93, IR 95780-43-1-1-1 and NVSR 2098) showed resistant reaction and 15 genotypes showed moderately resistant reaction against M. graminicola. Remaining genotypes were either susceptible or highly susceptible reaction against M. graminicola. Under nursery condition, maximum and significantly higher plant growth parameters of rice were observed in plants treated with neem cake enriched with Pseudomonas fluorescens @ 50 g/pot followed by FYM enriched with Trichoderma viride @ 50 g/pot. It was found that nematode reproduction and multiplication parameters such as number of galls/seedling, no. of eggs/seedling and final nematode population were significantly reduced in neem cake @ 50 g/pot + P. fluorescens @ 50 g/pot. Between different organic amendments higher plant growth parameters were obtained in neem cake than FYM. Similarly, in case of bio-agents, significantly higher plant growth parameters were observed in neem cake enriched with P. fluorescens followed by T. viride and Purpureocillium lilacinum.