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Resistance of Dalbergia sissoo to Fusarium solani f.sp. dalbergiae

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Summary

Large-scale dieback of Dalbergia sissoo trees in India and neighbouring countries is causing concern to the state forest departments and farmers as trees of all age group are dying. Fusarium solani f.sp. dalbergiae, isolated from the roots of dying trees and from the oozing pitch on stems, was tested for pathogenicity. Seeds were collected from 107 mature healthy trees, from 21 heavily infected localities in the country. As many seed failed to germinate, resistance testing was carried out on a limited number of provenances. Seedlings were tested for disease resistance by soil drenching and root-dip methods using spore suspensions of F. solani f.sp. dalbergiae. On the basis of seedling survival, provenances were classified into four susceptibility classes; seedlings from Amritsar (Punjab) showed maximum survival and were considered very resistant, whereas Dehra (Kangra), Himachal Pradesh, were the most susceptible. F. solani f.sp. dalbergiae from Nihal Gate (Haldwani), Uttarakhand, was the most virulent isolate amongst the three tested.
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Document Type: Research Article

Publication date: 2008-12-01

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