Total phenolics content was greater in downy mildew infected grape leaves than in healthy leaves. Polyphenoloxidase activity was roduced in infected leaves. the maximum reduction being in grade 2 infection. The sap in healthy leaves of all ages was acidic. The minimum pH was found in viridian green leaves and maximum in red leaves. The total organic acid content in infected leaves increased with disease intensity. Among the organic acids indentified, citric acid decreased in infected leaves.
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Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.
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