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Complication of pistachio sunburn Intensity of sunlight and increase in temperature to a Iranian Pistachio greater extent than the plant can tolerate (35-38 ° C depending on the variety) causes sunburn on pistachio fruit. In the part of the fruit that has been exposed to intense sunlight, the skin cells of the green skin and sometimes the bony skin of the fruit are destroyed and a necrotic and black state is seen. The embryos of most sunburned fruits are aborted, and these fruits are seen as hollow and half-brain at harvest. Different cultivars of pistachios have different sensitivities to this complication. Among the important commercial cultivars of pistachio, Mumtaz cultivar is the most sensitive and Akbari cultivar is the most resistant cultivar to this complication.