Recently, some dealers called to inquire that a large area of ​​spinach leaves planted on the local vegetable base had a white patch of rice grains or beans of varying sizes, which was significantly different from the symptoms of harm caused by hops and fleas. Small white spots are not perforated, and hand touches are easier to break. The use of downy mildew medications (enoic morpholine or metalaxyl manganese zinc) did not work well, and individual users suspect it was a phytotoxicity. After learning of this situation, the author after investigation found that this is most likely to be caused by white pepper disease.
This disease is called white spot disease, also known as leaf spot disease, which mainly damages the leaves. Under normal circumstances, it begins with the lower leaves. Poor growth, warm and humid, poor management and other conditions are prone to disease. Symptoms are round or near-circular and have a size of about 0.5-3.5 mm. At the beginning of the onset, the middle of the disease was greenish, and the edges were light brown or purple-brown and gradually expanded into white spots. Under the intense conditions of dry-wet transition, the middle of the plaque is easy to break, and when the humidity is high, the brown-brown mildew can grow on the lesion. When the disease is serious, the lesions on the leaves are densely covered, and within a short period of time, the leaves become dead and dry. Therefore, the elimination of the disease must not be taken lightly, and must be given enough attention, and strive to control the loss to a minimum.
Control measures: 25% difenoconazole EC 5 ml + 25% Prodicarb EC 10 ml, spray 15 kg water. 10% difenoconazole water dispersible granules 10 g + 75% chlorothalonil 33 g water 15 kg field spray. 50% iprodione 15 ml 15 kg water, all field spray. 25% azoxystrobin 10 ml water 15 kg, field spray.
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