It may be due to nematode damage or blight. Pull out some of the roots and see if the roots become thick, deformed, and nodules. If so, it is a root-knot nematode. In the early stage of nematode development, A. granules were used to treat worms and roots 2-3 times, or thiazophos was applied during the transplanting of melon seedlings. There was a certain control effect, and attention was paid to crop rotation.
If it is a wilt disease, after plant infection, the leaves will appear wilting in the sunny noon, and will return to normal in the early evening and early morning. After repeated days, the leaves will gradually turn yellow and die, the plants will die quickly, and the vascular bundle of the stem will become brown. . Fusarium wilt disease can be prevented and can not be cured, can only pull out the diseased plants, change to other vegetables, and to spray more triazoles, copper pesticides to prevent pesticides.
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