Maize rough dwarf disease is a viral disease transmitted by the planthopper. Due to the freezing damage caused by heavy snow last winter, some of the wheat fields in our city are to be destroyed in order to plant corn in advance. From May to June, it is the first occurrence period of SBPH. Therefore, special attention should be paid to the prevention of dwarf diseases in early sowing of corn. .
I. Symptoms of corn rough dwarf disease The rough dwarf disease can be felt in the whole growth period of corn. Typical symptoms include severe dwarfing of plants, shortening of internodes, and dense clustering of leaves. The victim leaves are darker green, shorter, harder and brittle than the normal leaves, and the veins on the back of the leaves have bulges.
Second, the law of the occurrence of the brown planthopper occurs four to five generations a year in the north. The nymphs were overwintering under the weeds in the fields, rice and wheat roots, and fallen leaves. The most leewards were sunny, warm and humid. From December to February, the coldest nymph drilled into the clay blocks remained in place. The activity began in March and moved from the wintering place to the budding grassland and wheat fields. In general, there are two peaks in spring and autumn in one year. Laodelphax striatus has strong low temperature resistance and poor adaptability to high temperature. The suitable temperature for growth and development is around 25°C. With the mature harvest of wheat, corn planting, and the transfer of SBPH to corn, it is most harmful to sowing early corn. In addition, the land near the orchard and the field of flower arrangement are also seriously affected.
Third, prevention and control measures There is no specific treatment of corn rough dwarf disease, once the disease is basically no yield. Therefore, pest control is a key measure for disease prevention.
1. Pay attention to seed dressing or seed coating. 40% methylisophosphoric acid can be used to coat or coat 0.2% of the seed amount. At the same time adding 2.5% SiLok or 20% triadimefon (0.1% seed dressing) to prevent corn black powder and other diseases.
2. Remove weeds from the ground and destroy the environment in which the migratory locusts lay their eggs.
3. After the emergence of corn, a centralized prevention and control of a fly ash, can be used to control 10 to 20 grams of 10% imidacloprid spray control planthopper. At the same time can be added to the antiviral agent A virus or phytosanitary No. 2 30 to 50 grams (milliliter) water 30 kg mixed spray control. 7 to 10 days once, even spray 2 or 3 times.
Matters needing attention: Cheng Fang contiguous field to form a protective belt around the spray to protect the bandwidth of 3 to 5 meters. The fields in the flower field and near the orchard should be sprayed all over the field. At the same time, attention should be paid to the prevention and control of weeds in the ditch and the land.
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