There are three main diseases of zucchini, viral diseases, gray mold and powdery mildew.

Botrytis cinerea. Boscalid, iprodione, procymidazine, pyrimethanil, sclerotium, Trichoderma harzianum, etc. can be used for control.

Powdery mildew can be controlled with difenoconazole, tridiconazole, tebuconazole, etc. Flusilazole and azoxystrobin can also be used for prevention and treatment.

Viral diseases can be prevented and treated with ningnanmycin, lentinan, morpholinone hydrochloride, triazole, etc.