Reaction of some host plants to different races of root-knot nematode, Meloidogyne Incognita

Evaluation of seventeen populations of Meloidogyne incognita falling in four races for their reaction on eight plant species belonging to cowpea, mungbean, tomato, and chilli showed that although, penetration of second stage juveniles occurred in all hosts irrespective of the race, but gall formation was not observed with Hissar, Chandigarh and Delhi populations (race l), Coimbatore (race 2) and Shimla (race 4) on tomato cv. PNR-7. Differences were noticed with Bangalore, Bhubaneswar (race I), Bagora and Rahuri (race 2), and Shimla (race 4) forming egg mass on cowpea cv. (−1 52; Bhubaneswar (race 1) on (−152 and Jodhpur (race >3) on cowpea cv 82-1B; Pusa, Kayangulam, Jabalpur and Kanpur (race 1) on tomato cv. PNR-7; Pusa, Bangalore (race 1) on mungbean cv. ML-62. The population of Bangalore, Jabalpur, Bhubaneswar and Udaipur (race 1) had not multiplied on chilli cv. X-2-3-5. Such differences were observed in population of same race or among the races of M. incognita are not reflected when host differentials as used under IMP are taken. Thus, the need for augmenting host differentials to cover up this variability is suggested.