1Department of Nematology, Agricultural Research Station, Durgapura, Juipur 302 018.
2Department of Nenmatology, CCS Haryuna Agricultural University, Hisar.
*Part of Ph. D. thesis submitted by senior author to CCS, HAU, Hisar.
The development of Heterodera avenae (Sirsa population, pathotype Ha 21) was studied on 4 cultivars, 2 each of barley (RD 2052 and RD 103) and oat (OS 7 and a local cultivar). Penetration of second stage juveniles of H. avenae occurred in susceptible as well as in resistant cultivars. Resistant barely cv. RD 2052 exhibited the initial symptoms of lateral branching and syncytium formation almost at par with susceptible check, RD 103. Fewer number of second stage juveniles that had penetrated the root could reach 53/54 female stage as compared to susceptible one. A good number of males were recorded in RD 2052 indicating male:female ratio in favour of males as compared to susceptible check. On OS 7 and local oat cultivars, majority of the second stage juveniles that had penetrated the roots failed to develop further and there was no swelling or branching of infected roots.
Heterotieru uvrnae, development, susceptible, oat and barley
