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Fusarium wilt is a typical soil disease that harms the whole plant. Bacteria can survive for many years in diseased plant debris or in soil, and can also spread with unfermented manure and seeds. Germs invade or penetrate the epidermis from the root wound and eventually enter the vascular bundle. Due to bacteria blocking the catheter, affecting the normal physiological functions of water transport and secretion of toxins to destroy plants, the diseased plants wilted and the lower leaves became yellow, so that the whole plant died. Sometimes only one side of the depression pits, causing half withered. Cut open the sick scorpion and you can see that the vascular bundle turns brownish brown, and the root of the diseased plant is brown and rot, and it is easy to pull up.
Some fellows said that it was the crops that had cancer and there was no way to prevent them. This statement is not correct. Although this disease is difficult to control, there are still ways to do so. First of all to prevent. Once the plant is sick, it cannot recover, even if it does not die, it will reduce the yield. Therefore, the diseased plant should be removed in time. On the other hand, it is necessary to take comprehensive prevention and control measures at the stage of occurrence of disease spots. Early treatment is the key to disease control. Prevention and treatment after general disease can only reduce losses to some extent.
In the use of medicaments, at the beginning of the disease, Green Hunter No. 1 3000-4000 times solution can be used to irrigate the roots, or 70% soil eliminator (hydoxamer) wettable powder can be used as 1500 times, and 10% water can be dispersed. 3000 times solution. 45% Tecdor (thiabendazole) suspension 1000 times Irrigation root, per plant 200 ~ 300 ml. It is necessary to focus on controlling the plants adjacent to the diseased plant to remove the diseased plant.
In order to prevent the spread of pathogenic bacteria, 70% thiophanate-methyl (thiophanate-methyl) WP may be used as a 500% solution, or 50% carbendazim WP may be used as a 1000-fold solution for 40 minutes or 0.2% of the seed weight. ~0.3% seed dressing.
The use of disease-resistant varieties, rotation, and soil drying and other agricultural control measures also have good results. The rotation with other crops should be more than 3 years, and the best choice for wheat, corn and onion and garlic crops. Many places have promoted grafting and disease prevention measures on a large scale. For example, cucumbers are grafted onto black-skinned squash or peony pods, and watermelons are grafted on pods, gourds, or Nanzhan No.1. The technique is not difficult to master. Another point, still emphasize rural health. Straw, especially diseased plant residues, must be cleared out, concentrated or buried in high temperatures, and not using unfermented manure in order to reduce the accumulation of pathogens.
How to prevent melon wilt
Some peasant friends have reported that the death die phenomenon often occurs in the old vegetable fields, especially cucumbers, watermelons and other melons, and this problem is often encountered. In fact, this kind of dead medlar is wilt disease, including cucumber wilt, watermelon wilt, melon wilt and bitter melon wilt.