There are three main types of diseases that can cause death. The most common cause is wilt caused by Fusarium, followed by blight caused by another fungus, and root knot nematode disease. All three diseases can cause the leaves to wilt quickly and the whole plant to die. When looking at the three diseases carefully, the stems are looked at. Wilt disease stem surface normal or only in the late base of the longitudinal crack, with a knife obliquely visible vascular bundle browning; root knot nematode symptoms occur in the roots, nematodes stimulate plant roots form nodules, began milky, after the change Light brown, small as small grains, large as mung beans or larger, stripped of root knots, translucent nematodes can be seen under the microscope; neither of the above two diseases harms the leaves, and the blast disease can harm simultaneously Leaves and stems. After the leaves are damaged, round yellow-brown lesions are generated, and many black dots can be grown in the later stages. The lesions are easily broken. The lesions on the vines are elliptical to spindle-shaped, white, and the weather is damp. Only a part of the leaf blight is often wilting or dead.
Need special tips, sickle blight and root knot nematode disease are more difficult to control the disease, the pathogen can survive in the soil for many years. Continuous cultivation of melons will increase the number of pathogens, and the condition and harm will continue to increase. Therefore, crop rotation and cultivation of disease-resistant varieties are the first choices for prevention and control. The grafted seedlings with black seed pumpkin as the rootstock are the main measures to control cucumber wilt disease. Removal of sick bodies and removal of diseased plants are also very important preventive measures.
It is indispensable to fight against the above three diseases, but it is imperative to diagnose accurately and use different agents for different diseases. The prevention and treatment of nematodiasis can be treated with C-phosphorus (yishubao), chlorzothiazol, thiazophos (10% blessing and more), avermectin, mycelia and other agents to treat the soil, and can also be used to irrigate the roots at the early stage of the disease; For the control of fusarium wilt, the use of hymexazol (fermented soil), benomyl, carbendazim, thiophanate-methyl, etc. to treat the soil or to irrigate the roots; for stem disease it is mainly stem and leaf spray protection. Qing, flusilazole (Fu Xing) and so on.
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