DEVELOPMENT OF HETERODERA AVENAE BIOTYPE HA 31 ON RESISTANT BARLEY AND OAT CULTIVARS

H. K. Bajaj, R. S. Dahiya, M. R. Dalal

Abstract


Development of Heterodera avenae biotype Ha 31 was compared on the resistant cultivars barley C 164 and oat Kent and on the susceptible cultivar wheat C 306. Juveniles (J[sub2]) penetrated each of the cultivars but significantly fewer penetrated the roots of oat. Further development ceased in oat and J[sub2] disintegrated except for the few which were able to develop into normal males. Development in barley roots was normal, but the majority of adult females remained small-sized and failed to extrude from the roots and thus were unable to copulate and reproduce; sex ratio was affected in favour of males. Oat cultivars HFO 114, Kent, OS 6 and OS 7 commonly grown in Haryana state of India were resistant to biotype Ha 31 of H. avenae.

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