What's wrong with green onions! thank you

Phytophthora blight, purple spot, liriomyza sativae, physiological problems.

First, it is suggested that dimethomorph, fenpropathrin, metalaxyl, propamocarb hydrochloride, ethyl phosphate, aluminum, manganese and zinc should be used alternately, and the leaves should be smooth and non-sticky, preferably mixed with silicon additives. Downy mildew pesticides simultaneously treat epidemic diseases. It is best to add foliar fertilizer.

Prevention first, comprehensive prevention and control. Use pesticide ingredients alternately, and don't use the same pesticide ingredients continuously. This is the principle of plant protection.

Second, purple spot disease, it is recommended to use myclobutanil or flusilazole or bromothalonil or difenoconazole propiconazole alternately, and the leaves are smooth and drug-free, so it is recommended to mix them with siloxane. (They also control rust.)

Prevention first, comprehensive prevention and control. Use pesticide ingredients alternately, and don't use the same pesticide ingredients continuously. This is the principle of plant protection.

Third, mix foliar fertilizer at the same time.

4. The white line segment is harmful to Liriomyza sativae, so it is suggested to spray abamectin or mirex or abamectin monosultap for control.