In recent years, the root rot of corn seedlings has become increasingly serious and has become an important disease that harms corn. In the early stage of the disease, brown spots appear in the root tip or root of the corn seedlings, and the lesions continue to expand, which can brown all the roots. The roots of the roots show water stains, yellowing, post-rotation and necrosis, and the root barks are easy to fall off. The disease can spread to the shoots, and there are cloud-like brown spots on the stem base and leaves. In severe cases, the leaves appear to be burning and die. The stem base also rots and can be pulled up by hand. The main pathogens of root rot in seedling stage are Fusarium oxysporum and Fusarium graminearum. Fusarium can cause stem rot in the plant body after root rot disease, and then spread along the stalk to the ear, causing corn ear rot. The sowing period is the best invasive period of Fusarium, the incidence of root rot The rate is the highest. The return of the diseased plant straw to the field can increase the incidence of root rot, and the disease of the land with heavy potassium and heavy nitrogen fertilizer is aggravated. The application of potassium fertilizer and organic fertilizer, the incidence of corn root rot is reduced. The prevention methods are as follows:
1. Add potassium sulfate, potassium chloride or potassium-containing compound fertilizer, and use 6-7 kg of pure potassium per mu as base fertilizer. More slashing and raising the ground temperature. Strengthen the management of fertilizer and water, and promote the growth of seedlings. Eliminate the return of the diseased plants to the field and reduce the source of re-infection.
2. Potassium fertilizer roots control, the disease rate of more than 10%, the use of potassium chloride 3 to 5 kg, or grass wood ash 50 kg. The rate of diseased plants is between 10% and 20%, and the use of potassium chloride is 8-10 kg, or the plant ash is 80-100 kg. The rate of diseased plants is more than 30%, and the use of potassium chloride is 10-15 kg, or the plant ash is 100-150 kg. When applying, the potassium chloride is dissolved in water, and the ash should be applied separately, and should not be applied together with chemical fertilizer and water feces. Multi-component compound fertilizer and potassium dihydrogen phosphate leaf spray can also be used.
3. Chemical control, using 40% root sulphate 600 times solution or 50% carbendazim + 40% ethyl phosphate aluminum 1000 times solution or 70% thiophanate + 40% ethyl phosphate 1000 times solution per plant 100 grams The liquid is poured into the root.
Shandong Science and Technology News
1. Add potassium sulfate, potassium chloride or potassium-containing compound fertilizer, and use 6-7 kg of pure potassium per mu as base fertilizer. More slashing and raising the ground temperature. Strengthen the management of fertilizer and water, and promote the growth of seedlings. Eliminate the return of the diseased plants to the field and reduce the source of re-infection.
2. Potassium fertilizer roots control, the disease rate of more than 10%, the use of potassium chloride 3 to 5 kg, or grass wood ash 50 kg. The rate of diseased plants is between 10% and 20%, and the use of potassium chloride is 8-10 kg, or the plant ash is 80-100 kg. The rate of diseased plants is more than 30%, and the use of potassium chloride is 10-15 kg, or the plant ash is 100-150 kg. When applying, the potassium chloride is dissolved in water, and the ash should be applied separately, and should not be applied together with chemical fertilizer and water feces. Multi-component compound fertilizer and potassium dihydrogen phosphate leaf spray can also be used.
3. Chemical control, using 40% root sulphate 600 times solution or 50% carbendazim + 40% ethyl phosphate aluminum 1000 times solution or 70% thiophanate + 40% ethyl phosphate 1000 times solution per plant 100 grams The liquid is poured into the root.
Shandong Science and Technology News
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
Fully Threaded Stud,Galvanized Threaded Rods,Zinc Plated Full Thread Stud,Metric Threaded Rods
Kunshan Liyue Hardware Products Co.,Ltd , https://www.fixlyhardware.com