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Pistacia integerrima is a deciduous tree species belonging to the family Anacardiaceae. The plant possesses numerous phytochemicals of ethno-medicinal importance. In a routine mycological survey carried out from July 2013 to June 2014, leaves of P. integerrima were found infected with fungi causing rust and blight diseases. The morphological and microscopic observations revealed three fungi, namely Skierka himalayensis, Pestalotiopsis sp., and Pileolaria pistaciae, which were found to cause rust and blight diseases. One new species of rust fungi, namely Skierka himalayensis sp. nov., and Pestalotiopsis sp. are reported for the first time from India. The detailed descriptions and illustrations of these three phytopathogenic fungi are provided in this paper.