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How does dandruff occur in pistachio orchards? Dandruff is a pest on the roots of pistachio trees that occurs due Iranian Pistachio to heavy spring rains or improper or excessive irrigation. It is necessary to explain that pistachio trees are much more resistant to soil salinity than other trees, but in any case, there is a limit to the degree of salinity of soils accepted by pistachio trees, and above that, the roots of the trees burn. But if the sources of water supply are fresh, the salinity of the soils (proportional to the life of the house and the frequency of their irrigation) will gradually decrease to reach a moderate or desirable level. This moderation of soil salinity occurs only in the field of feeding the roots of pistachio trees and the infiltration of water in a long continuum.