What is wheat grain scab nematode disease?

Wheat gall nematode is a plant disease that is also known as "wheat gall nematode". The cause of this disease is an obligate parasite, and reports show that this disease exists in many regions of the country, including Azad Shahr, Ramian, Gonbad, Aqqola, Aliabad, Bandar Turkmen, Kalaleh and Kordkoi, and the degrees of contamination are different.