Maize virus disease prevention and control technology

In recent years, the area of ​​corn virus disease has significantly expanded, and some fields have been seriously damaged, which has caused serious impact on production. Maize virus disease has dwarf mosaic disease and dwarf disease, and it is dominated by corn dwarf mosaic disease. The disease is transmitted by the virus-borne insects such as aphids, thrips, and migratory locusts. Once the disease occurs, there is no cure for the disease. The corn varieties used in current production are basically not resistant to viral diseases, and they are mainly controlled through the “Control of Insects and Diseases” to control the transmission of viruses. As the pre-transmitted vector locusts occurred more heavily than in previous years, corn virus disease has a potential threat of epidemic damage this year.

Symptoms and patterns

The chlorotic chlorotic spots were firstly formed between the veins of the young leaf base of the seedlings of maize, and gradually expanded to the whole leaf, showing a mosaic shape. Usually, the corn plants are dwarfed, and the severely affected plants cannot pick and solid, and the plants will die prematurely. Corn can be infected by the whole growth period, susceptible to disease before the 5th leaf stage, and increased after the 10 leaf stage. In the diseased fields, the spring corn is generally heavier than the summer corn, the intercropping field is more important than the live-broad field, and the incidence of replanting corn in the vegetable field is serious. The maize incidence near the Tanabe, vegetable fields, orchards, roadsides and canals, and low-lying areas is uneven. High, extensively managed, overgrown fields and low-fertility soils with weak seedlings are also susceptible to disease.

Control methods

During the period of disease-afflicting, we adhere to the comprehensive prevention and control techniques that are mainly based on agricultural control and supplemented by chemical control. The core is to control the source of poison, reduce the source of insects, and avoid hazards.

1, choose resistant varieties.

2. Maize should be sowed at an appropriate time, trying to avoid the activity of the first generation of the planthoppers or locusts.

3. Remove weeds, eliminate poisonous sources and insects, and reduce damage.

4. Strengthen field management. Combined with seedlings and Dingmiao, remove the diseased plants in the field and concentrate deeply or burn them to reduce the source of infection. Scientific fertilization, watering, and strengthening of field management will promote robust corn growth, shorten disease duration, reduce opportunities for virus transmission, and increase corn disease resistance.

5, pharmaceutical control. (1) Seedlings should be treated as soon as possible at the seedling stage, and can be uniformly sprayed with 10% imidacloprid wettable powder 3000 to 5000 times or 25% buprofezin wettable powder 1000 to 1500 times. For the land on the sides of the ditch, roadsides, and weeds, we must focus on prevention and control. We must pay attention to the prevention and control of intercropping and intercropping corn fields to reduce the damage caused by insects. (2) In the early stage of viral disease, 20% of virus A WP 400 times or 1.5% of phytosanitary emulsion 1000 times can be sprayed. (3) Dressing with systemic insecticides, such as 2 kg of corn seed dressing with 25% pymetrozine 5 to 8 g into the mother liquor (water content equal to 50 kg per 1 kg corn seed), dry After sowing, it can prevent and control the damage of corn planthopper during the seedling stage, so as to achieve the purpose of controlling the spread of corn roughage virus.

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