Complication of root rot of pistachio pistachio shell trees
Crown and root phytophthora rot is prevalent in most fruit-bearing countries of the world in orchards, kernels of dried fruits, especially pistachios, walnuts and almonds, and causes great damage to them.
Symptoms on the aerial parts are general weakness and deciduous trees and the appearance of mild yellowing on the leaves. The skin of the crown and sometimes part of the trunk cracks. The tissue under the skin of the trunk at the location of the canker turns blackish brown. Dark-colored main and secondary roots later turn black due to the activity of other microorganisms. Sick trees may dry out.
Fighting the root rot of pistachio trees
The measures that are effective in controlling the disease can be summarized as follows:
Minimize the duration of garden soil saturation, especially near the root system.
Construction of gardens on lands without drainage, as well as drainage and ventilation of drainage and wet soils of constructed gardens.
Planting trees on the soil of low ridges so that when irrigating, water surrounds the trunk and crown of the trees.
Use of tolerant rootstocks in grafted trees.
The use of systemic fungicides, such as fusetyl aluminum, is somewhat effective in preventing and controlling the disease in diseased trees. Destroys. For this purpose, about 120 grams of 15% fossil aluminum granules can be sprayed in a radius of 1.5 meters around the trunk of each tree and plowed with a shovel to transfer the poison granules to the soil and then irrigate the treated trees. Alite treatment of trees should be repeated 4 times a year, 3 times in spring at intervals of one month and the fourth time in autumn.
Shaving the rotten and infected parts of the trunk, crown and roots and destroying the shaved remnants and coating the shaved areas with a thick liquid containing powder and board 80% alite, talc powder and water, preventing flooding and wetting of the infected parts Reduces the development of disease in diseased trees and delays their death.