It is a mitochondrial respiration inhibitor, which works by blocking electron transfer during cytochrome synthesis. It has protective, therapeutic, and leaf penetration conduction effects. Field efficacy trials of pyraclostrobin emulsifiable concentrate have shown good control effects against downy mildew, banana black spot, leaf spot, and sclerotinia diseases. The application rate for controlling downy mildew is 75–150 g active ingredient per hectare (equivalent to 20–40 mL of commercial emulsifiable concentrate per 667 m2). After dilution with water, apply evenly by spray at the early stage of the disease. Generally, spray 3–4 times at intervals of 7 days. For controlling banana black spot and leaf spot, the effective concentration is 83.3–250 mg/kg (diluted 1000–3000 times). Start spraying at the early stage of the disease, generally applying 3 times at intervals of 10 days. The number of sprays depends on the severity of the disease. It is safe for cucumbers and bananas, with no observed phytotoxicity.