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A field survey had been carried out from September 2013 to November 2015 in some tea gardens of Terai region, West Bengal. It was found that the Red rust (Leaf and Stem) attack near about 42% of total disease occurrence. Blister blight attack near about 22% , Poria Disease 7%, Brown blight 4%, Black rot 3%, Grey blight 3% , Red root rot 3%, Brown root rot 2%, Violet root rot 2%, Black root rot 1%, Charcoal stump rot 1%, Jew’s ear fungus Jew’s ear fungus 1%, Thorny blight 1%, Ganoderma 1%, Thorny blight 0.5%, Tarry root rot 0.5%, Purple root rot 0.5% and Nectria 0.5% respectively of total disease occurrence. It was also observed that from last 2 years the Blister blight disease attack is increased approximately double compared to previous years. The tea gardens of that region uses Tea Research Association (TRA) recommended and Tea Board approved fungicides to control them.