Yellow-white, round spots appear on the leaves of melon scab, leaving yellow and white circles behind the perforations. The faucet turns brown and rot, causing a "padding." The stem vines and melon spots initially stained green, then turned dark brown, irregularly shaped, sag, flow plastic, commonly known as "oil." The smoke black mold layer on the lesion when wet. The pathogenic bacteria overwintered on the seed or diseased body with mycelia or conidium plexus, and the spores germinated in early spring for initial infection and reinfestation, and spread by airflow and rainwater. When the humidity is high, a low night temperature can exacerbate the disease.
Control methods:
Apply basic fertilizers, increase phosphorus and potassium fertilizers, cultivate strong seedlings, plant dense and properly remove old leaves.
Seed treatment. Soaking with 100% glacial acetic acid for 30 minutes. At the early stage of disease, the following fungicides or formulas can be used for prevention and treatment: 40% fluorosiliconazole 4000-6000 times solution + 80% fully-complexed mancozeb WP 800-1000 times; 50% isoprenil wettability Powder 1000-1500 times; 62.25% Myclobutanil Mancozeb Wettable powder 800-1000 times; 50% Dimoxystrobin dry suspension agent 3000-4000 times; 560g/L cyanobacteria chlorothalonil suspension 800 - 1000 times the liquid; 1.1% catechin WP 1000-2000 times; on the water spray, depending on the condition 7-10 days 1 time, rotation for spraying.
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