Author(s): Sweta Kumari and Dr. Shivanand Singh

Abstract: The study of the population fluctuation of Citrus nematode (Tylenchulus semipenetrans) in production area is necessary to find the damaging potential of Citrus nematode, identify key factor that influence Citrus population densities and find effective management strategies. In present study, I studied seasonal population fluctuations in two infected Citrus orchards during 2023. I evaluated the effect of soil temperature on the population of the nematode. Then I observed the nematode population is differ at both the soil depth. The nematode populations and female per gm roots are higher at 30 cm soil depth than 20 cm throughout the year at both orchards. The nematode population in soil and female in roots are the higher during May to June and August to September throughout the year. The regression analysis between number of nematodes and temperature in soil and females in roots show highly significant results at both orchards. I observed maximum nematode and female populations at a temperature between 25 to 29 degrees Celsius at a soil depth of 20 cm and 30 cm. Minimum nematode and female populations at a temperature between 9 to 12 degrees Celsius at a soil depth of 20 cm and 30 cm. I concluded from present study that the management of Citrus nematode to apply some chemical materials that protect the new roots from the nematode infections.

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