Hello, expert, can you spray bactericide on green onions to treat epidemic diseases and purple spots on cloudy days?

On cloudy days, the stomata of plants are closed and the drug absorption is not good.

It is recommended to take medicine on sunny days and avoid high temperature at noon.

If the time is not good, you must take medicine on cloudy days, and choose to take medicine when the temperature is high at noon and the light is slightly better.

Dry leaves are dry tips with pathological symptoms and physiological characteristics.

Physiological dry tip can be solved by applying water-soluble fertilizer.

This is onion wilt, which needs medical treatment.

He should have been ill for not less than ten days, and should have been prevented in time when the disease spots first appeared in the field.

The effect is not very good, so it is suggested to use cymoxanil manganese zinc or manganese zinc flumorph.

Two single doses can be used without combination.

Dimethomorph or cymoxanil plus mancozeb or carbendazim will do.

Phytophthora blight can be selected from mancozeb, azoxystrobin, polyoxin, pyrimidine nucleotide antibiotics, propineb, cuprous oxide, iprodione, azoxystrobin, difenoconazole, ammonium phosphate, ethylicin and pyraclostrobin.

Azoxystrobin or pyrazole azoxystrobin can be used alone.

You are welcome! Thank you for your trust.