Bacterial wilt is one of the common diseases in the process of planting corn. If planters want to improve the quality and yield of corn, it is necessary to prevent and control the bacterial wilt in time. It is necessary to know that if the corn suffers from bacterial wilt, it will cause the plant to die. , to reduce corn production, so the prevention and control of bacterial wilt should be timely, and then Xiaobian talk about the prevention and control measures of corn bacterial wilt.
First, the disease of corn bacterial wilt
a. Corn bacterial wilt is mainly caused by a variety of fungi, which occurs during the period from grouting to milk ripening, and the most mature from waxy to waxy;
b. Within one or two days of onset, the corn plants will lose water and dryness quickly; the ear sag will stop developing;
c. Leaves with slow onset will turn yellow from the bottom to the top, and some will appear withered leaves;
d. The stem will brown in the initial stage, showing water-stained shape, showing streaky depression after water loss, the marrow part becomes empty, and the plant is easy to fall;
e. Incision of the diseased stem will reveal that the vascular bundle becomes brown, and white hyphae and pink mildew layer will grow in a humid environment.
Second, the incidence of corn bacterial wilt
a. The climate of planting corn is relatively humid, with heavy rainfall and heavy rainfall, which tends to aggravate bacterial wilt;
b. Although the plant has little stem blight in the seedlings and in the early growth stage, the resistance of the corn plants to the grain filling and milky stage will decrease. If it is in a humid environment, it will easily lead to a large number of diseases of the bacterial wilt.
c. Because the soil of the continuous crop corn field contains a large number of pathogenic bacteria, it is easy to cause the plants to be infected.
Third, the prevention and control measures of corn bacterial wilt
1. Select resistant varieties
a. Choose varieties with strong disease resistance, such as Beijing Deon Zhengdan 958, Nongda 108, etc.;
b. Do a good job in field management. The sick leaves should be concentrated and brought out of the field to be buried or burned;
c. Deeply ploughing the soil after harvesting the corn to reduce and control the source of infection;
d. In the later stage of corn growth, enhance the absorption capacity and permeability of the roots of maize plants by cultivating and cultivating soil;
e. In the rainy season, timely drainage measures should be taken to prevent water accumulation in the field.
2, seed treatment
Seed coating agent coating, because the seed coating agent contains bactericidal ingredients and trace elements, effective method of bacterial wilt, the amount used is 1/40-1/50 of the seed amount.
3. Reasonable rotation
a. In seriously ill plots, crops such as soybeans, sweet potatoes, and peanuts can be rotated;
b. When planting corn, try not to plant it again.
4. Add fertilizer
a. Apply 3000-4000kg of high-quality decomposed farmyard manure, 13-15kg of pure nitrogen and 8-10kg of potassium sulfate per mu, so as to meet the nutrients needed for corn plants and improve disease resistance;
b. Spray prevention with 25% leaf dry spirit plus 25% toxic myricin powder 600 times solution or 58% toxic manganese zinc powder 600 times liquid trumpet period.
c. If some plants are found to have bacterial wilt, they can be rooted with metalaxyl 400 times solution or carbendazim 500 times solution, and each plant is filled with 500 mL.
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