Systemic resistance induction against alternaria leaf blight through avirulent strain of Alternaria brassicae in mustard
2007
Vishwanath | Vineeta
Alternaria leaf blight caused by Alternaria brassicae (Berk.) Sacc., is one of the most important diseases of the rapeseed-mustard crop. The present study deals with induced resistance in mustard using avirulent isolate of A. Brassicae against the two other virulent isolates of the same pathogen. The full leaf was pre inoculated with Alternaria alternata and challenge inoculated with Alternaria brassicae isolates A (aba) or Alternaria brassicae isolate C (abc). The Alternaria brassicae isolate A (aba) Challenged Inoculation (CI) showed maximum disease severity followed by Challenged Inoculation (CI) with Alternaria brassicae isolate C (abc) in comparison with Alternaria alternata-Water (Aa-W) check treatment which did not produce any spots on the leaf. The disease severity due to Alternaria alternata - Alternaria brassicae isolate A (Aa-aba) and Alternaria alternata - Alternaria brassicae isolate C (Aa-abc) treatments were comparable to Alternaria brassicae isolate A-Water (aba -W) and or Alternaria brassicae isolate C-Water (abc -W) treatments respectively. Similar results in terms of induced inoculation with Alternaria alternata (Aa) or Alternaria brassicae isolate D (abd) and challenged inoculation (CI) with or Alternaria brassicae isolate A( aba) and or Alternaria brassicae isolate C (abc) were recorded on the detached leaf. But the degree of increase in disease severity in the case of Alternaria alternata - Alternaria brassicae isolate A (Aa-aba) and Alternaria alternata - Alternaria brassicae isolate C (Aa-abc) was slightly more than on the attached leaf surface.
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