Prevention and treatment of corn brown spot disease

Corn brown spot disease is a serious and rapid corn disease in China in recent years. It can cause damage in severe cases. It occurs in all corn producing areas in China, including Hebei, Shandong, Henan, Anhui, Jiangsu and other provinces. The hazard is heavier, mainly in corn leaves, sheaths and stems. Let's take a look at the prevention and treatment of corn brown spot disease!

Corn brown spot damage symptoms

Corn brown spot disease occurs in corn leaves, sheaths and stems, first at the tip of the top leaves, with the most common lesions at the junction of leaves and sheaths, often densely integrated, initially yellow-brown or reddish-brown spots, lesions It is round or elliptical to linear, and the leaf tissue near the bulge is often red. Small lesions often come together. In severe cases, several or even all of the lesions are covered with lesions, and large on the sheath and on the veins. Brown spots.

In the late stage of the disease, the epidermis of the lesion was ruptured, the leaf cell tissue was necrotic, and brown powder was scattered. The diseased leaves were scattered locally, and the veins and vascular bundles remained as filamentous. Most of the disease on the stem occurs near the knot.

The pathogenesis of corn brown spot

Corn brown spot disease is conducive to disease in July and August if the temperature is high, the humidity is high, and the rainy days are high. In the infertile soil, the leaves are yellow and the disease is serious. In the land with high soil fertility, the corn is strong, the leaves are dark green, and the disease is light or not.

Generally, it is easy to cause disease when 8 to 10 leaves of corn are used, and the disease will not occur again after 12 leaves of corn. In addition, according to the investigation, the parents included susceptibility diseases of the corn varieties of Tangsipingtou, such as Shendan 16, Shandan 911 and Yuyu 26.

Agricultural control of corn brown spot

After the corn is harvested, the diseased tissue is completely removed and the soil is deeped. Choose resistant varieties and carry out rotation for more than 3 years. The planting density is appropriately dilute (3500 plants/mu for large ear and 500 plants/mu for dense varieties) to improve field permeability.
Apply enough base fertilizer and timely topdressing. Generally, the seedling fertilizer should be applied in the 4~5 leaf stage of corn, and the urea (or nitrogen, phosphorus and potassium compound fertilizer) should be applied 10~15 kg/mu. If the disease is found, it should be topdressed immediately, pay attention to nitrogen. , phosphorus, potassium fertilizer mix. Apply compost or fully decomposed organic fertilizer prepared by Japanese enzyme bacteria, timely topdressing and cultivating alfalfa, promote plant robust growth and improve disease resistance.

Corn brown spot disease drug control

Early prevention: In the 4 to 5 leaf stage of corn, 25% of rusting 1000 times liquid or 25% tebuconazole 1500 times liquid leaf spray per 667 square meters can prevent the occurrence of corn brown spot.
Timely prevention and control: Immediately after the initial onset of corn, spray 25% of triadimefon (triazolone) wettable powder 1500 times solution or spray with fungal agents.

In order to improve the control effect, it is possible to add some foliar fertilizers in the liquid medicine, such as potassium dihydrogen phosphate, diammonium phosphate aqueous solution (the original urea and the subsequent application of quick-acting nitrogen fertilizer are contradictory), blue crystal code multi-dimension, strong Han liquid fertilizer, combined with the application of quick-acting fertilizer, can control the spread of disease, and promote the robustness of corn and improve the disease resistance of corn. According to the characteristics of rainy weather, the spray sterilization should be 2 to 3 times, with an interval of about 7 days. Within 6 hours after spraying, the following rain should be sprayed after the rain.

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