Cucumber crops include cucumber, melon, watermelon, loofah, etc., belonging to the genus Cucurbitaceae. The main diseases of melon crops: blight, downy mildew, powdery mildew, bacterial angular spot, etc. The following are a brief introduction to several common diseases and prevention.
Bacterial wilt: Stem is the most important part of the disease. The seedlings are mainly caused by tender stems, and the affected parts appear moist and irregular dark brown lesions. The growth period is mostly at the base branch or near section. First, there are taupe to dark brown oval or amorphous lesions; in the late stage of the disease, the lesions are wrapped around the stem for 1 week, and the stems above the disease gradually die and die. If the fruit is infected, there will be irregular dark brown depression spots, which will not harm the vascular bundle.
Downy mildew: Because the disease spreads rapidly and the damage is serious, early prevention is especially important. The onset of adult plants begins with the lower leaves and gradually spreads upward. At the beginning of the disease, the surface of the leaves produces water-stained pale green or yellow-green small spots. Then the lesions expand and become pale brown. The veins are restricted by the veins to form polygonal spots, and the purple gray mold layer is formed on the lesions on the back of the leaves.
Powdery mildew: mainly harms cucumber leaves, petioles and stems. At the beginning of the disease, the leaves showed divergent chlorotic spots. As the condition worsened, the entire surface of the leaves was covered with a layer of white powder.
Blight: The growth point of the seedling stage and the onset of tender stems, initially dark green water-immersed lesions, followed by dry and withered. Infected by adult plants, starting from the base of the stem near the ground, the water stain is dark green at first, the diseased part is softened and contracted, and the leaves above the diseased part are wilting and drooping, eventually leading to the death of the whole plant. The disease of the leaves is gray-brown water-soaked lesions with no obvious edges.
Anthrax: The disease occurs severely in the later stage, and the leaves are infected. First, there are moist small spots, which gradually expand into pale brown to dark brown near round lesions, up to 1-2 cm in size, and a circle of yellow appears on the periphery of the lesion. Halo, when wet, black granules of conidia clusters appear on the lesions.
Bacterial angular leaf spot: The leaves are damaged. They are light green and light brown after being water-stained. They are polygonal due to the limitation of veins. Later, the lesions are grayish white and easy to perforate. The lesions on the fruit are water-stained at the beginning, nearly round, and then pale gray, and cracks often occur in the middle of the lesion. Different from melon downy mildew, the lesions are much smaller and there is no mildew.
The above diseases will occur to varying degrees in the growth of melon crops. It is very important to strengthen field management. In addition, scientific chemical control is equally important. First of all, to identify the symptoms, the right medicine.
1. Before the onset and early onset, every 7-10 days, use a broad-spectrum high-efficiency protective fungicide 80% Daisen zinc wettable powder 600-800 times liquid, carefully spray the fruit and the leaves on both sides, effectively prevent melons Fungal diseases such as blight, downy mildew, powdery mildew, blight, anthracnose. Moreover, 80% Dyson zinc wettable powder effectively solves the problem of crop freezing and shrinking, and improves the cold resistance of crops.
2, melon bacterial disease bacterial leaf spot disease and fungal downy mildew, powdery mildew, etc., in the pre-onset or early onset every 7-10 days spray 600-800 times liquid 52% generation Zinc king copper wettable powder can prevent fungi and bacterial diseases of melons at the same time on both sides of the fruit and leaves. Save costs and save time and effort.
3. When the melon blight, powdery mildew, anthracnose, and epidemic disease occur, high-efficiency therapeutic fungicides can be used for prevention and treatment. When the melon disease occurs seriously, 600-800 times more than the bacteria can be added to the Jinshishi to prevent the fungal and bacterial diseases.
4. In addition, in the prevention and control of crop diseases and insect pests, people often pay great attention to the virulence of pesticides. In fact, the effect of a pesticide is also affected by the use of other conditions such as instruments and water quality.
This website: What are the main pests and diseases and how to prevent and cure crops and crops?
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