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Recognition of pistachio leaf spot disease One of the universal diseases Iranian Pistachio of pistachio is its leaf spot which is caused by the attack of several microscopic fungi whose names are given below: Pathogens: Alternaria alternata, stemphylliuem spp.and Other Alternaria spp. Symptoms of pistachio leaf spot disease Symptoms of this disease are seen as round or angular wounds (burns) on the leaves of male and female pistachio trees. When pistachio fruits ripen, sores appear on their skin. In the center of the leaf sores, fungal spores are produced so that rubbing the leaf with the fingers causes the fingers to turn black. Infection of the leaves with these fungi can cause severe premature shedding. In unripe fruits, the disease causes small black sores about one millimeter in diameter, while on the outside of ripe fruits, the size of these burnt spots reaches 5 mm, which is surrounded by a purple-red border. These wounds damage the soft skin of the pistachio and stain the bony skin. Pistachio leaf spot disease Fight against leaf spot disease This disease is not very common at the moment and is not severe. Pruning of adjacent branches, weeding and timely and appropriate irrigation are among the useful measures. Also, if the disease worsens, it can be treated with Captan toxin at a rate of 3 per thousand at the beginning of the above symptoms. Took action.