How to distinguish tomato Fusarium wilt from bacterial wilt? A detailed guide to identification methods

In recent years, with continuous tomato cropping, pathogens have kept accumulating in the soil, causing tomato wilting and plant death to occur again and again.

It is understood that the main diseases causing tomato plant death include Fusarium wilt, Phytophthora root rot and bacterial wilt. For vegetable growers, Fusarium wilt and Phytophthora root rot are relatively easy to tell apart (with the former, the tomato root surface generally does not turn brown after onset, while the latter shows brown or dark brown rot); distinguishing Fusarium wilt from bacterial wilt, however, is rather difficult, because the symptoms of tomato Fusarium wilt and bacterial wilt are very similar, and both diseases affect the vascular bundle.

According to vegetable pathology, tomato Fusarium wilt is caused by Fusarium oxysporum (also called fusarium), while bacterial wilt is caused by bacteria. Therefore, when identifying them, a diagnosis can be made based on the differences between the pathogens.

  Method one: Cut off the root or stem of an affected tomato plant and put it in a cup or bowl filled with clean water, stir a few times, and if you see smoke-like bacterial ooze flowing out (called the “bacterial streaming” phenomenon in pathology), it can be preliminarily determined to be bacterial wilt caused by bacteria. If there is none, it is fungal Fusarium wilt.

Method two: Put the diseased tomato plant into a plastic bag, spray an appropriate amount of water, seal the bag and observe. After two or three days, if white or pink mold layers appear on the affected parts, it can be judged as tomato Fusarium wilt, whereas bacterial wilt shows no such symptom.