Causes and control measures of wheat root rot

Wheat cultivation occurs in all countries. China mainly occurs in Northeast, Northwest, North China, Inner Mongolia and other regions. In recent years, it has been expanding, and wheat areas in Guangdong and Fujian have also been found. Similar to the symptoms of retting root disease. After being infected by bacteria, the underground root gradually spread from the fibrous root to the branch root and then to the main root, and the color gradually changed to dark brown. After the disease, the underground root slowly rotted, the initial ground stem had no obvious symptoms, but for a long time without the supply of fertilizer and water from the root, the stem withered and the branches and leaves turned yellow until death. Wheat, strawberry, Scutellaria baicalensis, Salvia miltiorrhiza, Radix Isatidis, Radix Astragali, Radix Pseudostellariae, Paeonia lactiflora and Codonopsis pilosula are easily infected with the disease.

The main cause of wheat root rot

Wheat continuous cropping for many years, the soil organic matter is too small, coupled with adverse weather effects; or due to the cultivation of crops is too high, both sides of the trench fertilization or weeding, resulting in root damage; or because Rain Water, irrigation, too much water, drainage is not timely; or lack of light, low temperature and high humidity, excessive soil viscosity, soil caking, poor ventilation In addition, when the heel system is injured and broken, it is also the most vulnerable to germs. Rain Water often suffers from root rot in season.

The characteristic of wheat root rot is

Wheat root rot is caused by Fusarium oxysporum, Fusariumsolani (Mart.) App.etWollenw, which is the main culprit of the disease. Lack of light, high soil viscosity / large amount of water, lack of ventilation, root damage and so on are the main causes of bacterial invasion. When the pathogen infects the root, brown to black spots are formed in the coleoptile, young leaves, root cap, root neck and underground stem, which gradually expand and rot, resulting in dead seedlings or plants. After the disease, the root gradually changed from light brown to dark brown. The pathogen remains in the soil for the winter, enters the crops from the above reasons the following year, and spreads through irrigation or rain.

There are some wonderful ways to control wheat root rot.

The combination of agricultural pesticides for the prevention and control of wheat root rot.

1. Agricultural prevention and control methods

① can cause the disease due to a large amount of stagnant water and untimely drainage, so it is necessary to choose relatively flat soil for planting.

② it doesn't matter if the soil in the planting area is uneven, but drainage should be done well to discharge stagnant water, especially in the rainy season.

③ soil viscosity is too high, easy to cause soil caking, easy to cause root underdevelopment. It is similar to the reason that humans wear clothes that are too tight and cause physical discomfort.

④ as we all know, the use of any fertilizer that is not mature is easy to cause the incidence of disease, and this is also the reason for the blight disease introduced above. Apply rotten organic fertilizer, potash fertilizer and phosphate fertilizer to make the plant "strong" to enhance disease resistance.

⑤ nursery bed selection, the best choice of crops to grow seedlings is different from last year's seedbed, that is, to be planted in reverse cropping.

It is also a good choice for ⑥ to choose high quality seeds. High quality seeds can also resist the occurrence of diseases to a great extent.

2. Pesticide control is closely related to carbendazim and metachlorin.

Like other diseases, the prevention and control of root rot by pesticides is first seed disinfection, then soil disinfection, and finally the choice of crop root irrigation drugs.

The seeds of ① were sterilized before planting. It is also the most common first step to reduce the disease. Seed disinfection dosage: because the seed area is smaller than that of soil medicine. Therefore, seed dressing can use relatively low-level drugs. Carbendazim in 600,800x liquid or carbendazim in 800g / 1000 times liquid.

Disinfect the soil before planting ②. The second step is to reduce the disease. The disinfection of soil is relatively higher than that of seed disinfectant. 1200-1500 times of carbendazim or 1500-2000 times of carbendazim.

Root irrigation was performed after the onset of ③. The third step is the way to reduce the disease. Root irrigation is similar to soil disinfection, and the application area is larger, so the dosage is the same. 1200-1500 times of carbendazim or 1500-2000 times of carbendazim.