Reaction of Date Palm Varieties to Leaf Spot Disease of Graphiola
2010
Thind, S K | Kaur, Nirmaljit | Anil Kumar,
Ten field grown Date palm varieties were evaluated against Graphiola leaf spot disease (Graphiola phoenicis (Moug.) Poit) at PAU, Regional Research Station, Abohar. The variety Zahidi was found resistant having minimum PDI. Thoory, Hallawi, Barhee and Khalasa were moderately susceptible, whereas, Degletnoor, Shamran, Hayani and Khadrawi were susceptible to the disease. Medjool was found highly susceptible to the disease. The content of moisture, chlorophylls (a, b and total), total sugars and proteins decreased, whereas, the total phenols increased in the Graphiola infected leaves as compared to the healthy ones. The variety Zahidi (resistant) have more phenols and total sugars and less moisture, chlorophylls and total proteins when compared with highly susceptible Medjool. These biochemical alterations may serve as diagnostic tools for evaluating the Date palm germplasm to Graphiola leaf spot disease.
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