The causative agent of this disease is four species of fungi Iranian Pistachio including (P. drechsleri) (P. cryotogea)

(Phytophtora citrophtora) and (P. megaspeama) which is capable of any

Annually destroy a large number of fertile and infertile pistachio trees. Transfer this

The fungus that is in the soil is done by moving the seedlings, soil and irrigation water.

The optimal conditions for this fungus are high humidity environment and in these conditions

It reproduces quickly and is easily transferable.

The best way to fight this disease is to take preventive measures. For this purpose

Direct contact of water with the crown should be avoided. In non-saline soil and water conditions

It is better to create a pan around the crown of the tree so that water does not reach the crown of the tree

And in saline water and soil conditions, it is better to rid the tree crown of soil

And fill with coarse almond sand. To prevent the spread of the disease should not drain the water

Used polluted gardens. In contaminated gardens, the watering period is longer than the irrigation intervals

Wet. For treatment in the early stages of the disease can be done around the crown

Treated with a mixture of Bordeaux, Fusetil Aluminum or other effective fungicides.