This is a picture of an infected pistachio tree of a pistachio garden in Iran. There is the suspicion of infection by root knot nematodes. In each row some trees are infected. I would be grateful if any researchers can give me advice on that.
Only the experienced plant Nematologist or plant pathologist can say that these are the symptoms caused by the root knot nematodes on the basis of their live observations. pictures is also helpful but if you really want to confirm it then you should try to confirm it by doing experimental processes which are easily available at the internet and other sources and this is the best way to confirm it or you can contact your senior scientists. I hope they will help you.
سلام اگر ممکن هست حاشیه دور درخت را خاکورزی کنید به اصطلاح پاکن کنید حداقل 2 بیل تا از این تنش بیرون بیاید. بدلیل سنگین بودن بافت خاک و زهکشی ضعیف خااک درخت دچار این مشکل شده است
Thank you @Mohsen Yazdani for sharing your idea concerning my question.
Elaheh Daghighi
It is very difficult to reach any definite conclusion from the posted picture.
Thanks!
Elaheh Daghighi
Also check it as "Pistachio dieback" which is a major disease in pistachio orchards of Iran.
Thanks!
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