Effect of different temperature on the life cycle of root-knot nematode, Meloidogyne incognita on okra

Abstract

The life cycle and development of root-knot nematode, Meloidogyne incognita, was studied in the roots of okra in a screen house for comparison. Length of the life cycle in root-knot nematodes is greatly influenced by temperature. The j2 of M. incognita penetrated into okra roots after 48 h in the month of April-May while in the month of March-April in 72 h. The third stage (j3) appeared on 8 DAI in the month of April-May as compared to month of March-April in 10 DAI. Young females were first noticed on 22 DAI and 24 DAI for the month of April-May and March-April, respectively. The life cycle of the root-knot nematode, M. incognita from j2-j2 stage was completed in 33 days in the month of March-April and 29 days in the month of April-May under screen house conditions.