Every year, with the onset of summer, in some pistachio orchards we Iranian Pistachio see the fall of leaves and sometimes clusters, which sometimes cause concern to farmers. So far, no research has been done on this subject, but the experiences of the past years show that along with the warming of the air and the increase of the plant's respiration rate, the increase of ethylene hormone causes the leaves and spikes to fall.

Specialized phytosanitary channel. Some factors exacerbate this complication. Such as waterlogging, the use of rotted manure, and هر In general, any complication that reduces the level of oxygen around the roots exacerbates the loss of leaves and fruit, which is temporary.

Calcium has an effective role in reducing the synthesis of ethylene in the plant. The penetration of calcium into the fruit reduces respiration and production of ethylene, and thus preserves and strengthens the fruit and stabilizes ACC oxidase activity. Farmers should consider this complication increases with irrigation. But this is temporary and usually stops after two or three days.

In general, this complication, except for the small damage that is imposed on the farmer by the fall of weak clusters, does not cause much concern and does not require special action. Unless the fall is severe and due to factors other than this and mechanical complications such as falling due to strong winds or hail.

We welcome the opinions of respected experts and farmers' experiences in understanding this complication as much as possible.