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Abstract
Rhizomes of turmeric are used in several culinary preparations. They have been used as household remedies since time immemorial. Phenolics are found in plants only and they play a great role in human health. The high performance liquid chromatography of different parts of healthy and infected plants reveals that the phenolic acid content is reduced in diseased tissues including rhizomes which are commonly consumed by human beings in several countries of the world. Results also showed that the infected leaves had maximum phenolic acids as compared to healthy leaves which indicate that due to infection the amount of phenolic acids increased. We report for the first time that leaf spot (Taphrina maculans) of turmeric (Curcuma longa), which is an important disease, reduces the quantity and number of phenolics thereby damaging the therapeutic properties of turmeric.