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Correct differentiation of cucumber brown spot, downy mildew, bacterial angular spot
In the vegetable farmers who came to see Dr. Wang Zhongchun for vegetables, a farmer in his fifties was particularly eye-catching. He brought a few leaves of cucumber. Wang Zhongchun’s teacher told him that he had brown spot when he was diagnosed. The leaves looked carefully for a long time. Finally embarrassed to say: "Mr. Wang, at first glance, this disease is very similar to the symptoms of downy mildew, and it is similar to bacterial angular spot disease. You talk to you about it. This is the difference!" Wang Zhongchun teacher According to the report, cucumber downy mildew, brown spot, and bacterial spot disease can all damage the leaves. The lesions are yellow-brown spots, and the lesions are limited by veins. Therefore, some vegetable farmers often do not understand the three diseases. The difference is that blindly using chemical reagents to mix and match results in many sheds that have caused phytotoxicity. The differences between these three diseases are as follows: Cucumber downy mildew, true leaf disease, water-soaked lesions on the leaf margin or on the back of the leaves, particularly evident in the morning, lesions gradually expanding, limited by the veins, showing a polygonal hazel or yellow Brown patches, when the humidity is large, the back or leaves of the leaves grow dark gray mold layer, late lesions or contiguous lesions, resulting in leaf margin curling dry, severe patches of a yellow, mostly occurred in the upper leaves of cucumber. The spots of cucumber brown spots turned brownish brown green, slightly round, 6-12 mm in diameter. Most of the lesions are limited by veins, irregular or polygonal, and some are grayish in the middle. To gray-brown, grayish black moldy, severe lesion integration, dead leaves. However, the lesions of brown spot do not gradually expand with the development of the disease, only the size of rice grains, and most occur in the upper leaves of the plant. Bacterial keratoses, real leaf infections are immersed in fresh green spots, light brown, lesions limited by veins, gray, brown or tan, and when the humidity is high, the leaves overflow with milky white muddy water. Beady pyogenic, white marks after dry, the disease is brittle and easy to perforate, not with brown spot and downy mildew. Drug control: Cucumber downy mildew can be used 72.2% propamocarb (Prike) water agent 600 times, 69% Manganese zinc (Ank manganese) WP 800 times, 60% Manganese fluoride (off Gram) 700 times spray control of wettable powder. Cucumber brown spot can be used 50% carbendazim WP 500 times, 75% chlorothalonil (Dakkoning) WP 600 times, 78% MnZn (Cobo) WP 600 times spray Prevention. Cucumber bacterial angular spot can be used 47% Chun Wang Tong (Garenong) WP 700 times, 78% MnZn (Cobo) WP 500 times or 40% Bacterial WP WP 600 times Liquid control.