Reaction of Vitis genotypes at the National Active Germplasm Site to downy mildew infection under tropical humid conditions of India
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Downy mildew, grape germplasm, natural infection.Issue
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Abstract
Two hundred and sixty six grape accessions at National Centre for Grapes, Pune were evaluated for their resistance / susceptibility to downy mildew during three consecutive natural epiphytotic conditions from 2004 to 2006, using the IPGRI/UPOV/OIV rating scale of 1-9. Twelve accessions, viz. Maroo Seedless, Bianca, Sirius, Madhu Angoor, Khalili, Seyve-Villard 12-375, Seyve-Villard 23-501, EC 38478, Carolina Black Rose, Seyve-Villard 18-315, Seyve-Villard 12-309 and Seyve-Villard 18-402 were rated as highly resistant. Seven accessions, viz. Seibel 9813, Seibel 9308, Seyve-Villard 12-364, Champanel, Amber Queen, 1613 C, Sauvis IP 365 were rated as resistant. The field reaction of these accessions was confirmed in vitro by leaf disc technique. Accessions H-533 and Concord (V. labrusca) were rated as moderately susceptible. All other accessions, including most of the commercial cultivars were found susceptible to highly susceptible to downy mildew.
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