Well developed egg masses of Meloidogyne graminicola on rice cultivar ‘IR-8’ were radiated in 60 Cobalt at 2.534 kilorads for 10 minutes. The infectivity and development of larvae hatched from this treatment was compared with larvae of untreated egg masses at weekly intervals following inoculations to ‘IR-8’ rice seedlings. Though the infectivity of radiated larvae did not differ, there was a delay in their development in rice roots. The egg mass production in radiated females was delayed by about a week compared to untreated females which produced egg masses in about four cweeks. The IInd, IIIrd and IVth developing stages within the rice roots did not show much differences in their size, but the females, developed from radiated larvae, were smaller as compared to their untreated counter parts. However, the fecundity of these nematodes was not affected as observed by all most equal number of eggs per egg mass which were of same size. Further, the next generation of larvae from these females developed normally like their untreated counterparts.
