Published in Scientific Papers. Series B, Horticulture, Vol. LXVIV, Issue 2
Written by Angel DIMITROV, Diyana ALEKSANDROVA, Stefan GANDEV
The Walnut bacterial blight caused by Xanthomonas arboricola pv. juglandis and walnut anthracnose caused by the fungus Gnomonia leptostyla (sexual stage) and Marssonina juglandis (asexual stage) are the most economically significant walnut diseases in Bulgaria's climate. This study compared the susceptibility of newly introduced walnut cultivars Valmit, Valeris, Sebin, and Yalova 1 to these diseases with that of the prevalent Bulgarian cultivars Izvor 10 and Silistrenski. Observations for disease symptoms on leaves were conducted twice annually in the spring and autumn in a young walnut orchard at the Fruit Growing Institute – Plovdiv. The average percentage of walnut leaf spots showed that the Romanian cultivar Valmit (31.44%) was most affected. Another Rumanian cultivar Valeris was reported with the lowest percentage of infection to fungal disease with 22.30% infected leaves. From the observed cultivars, the most affected by bacterial blight was the Bulgarian one - Izvor 10 in degree 8.6%, which determinated it as a high susceptible to this disease. In our research the Turkish cultivar Yalova1 was reported as the lowest susceptible with 4.74% infected leaves.
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