In recent years, the area of ​​corn virus disease in Fuping County has been significantly expanded, and the damage to some fields has been very serious, which has had a serious impact on production. Maize virus disease mainly includes corn dwarf mosaic virus disease and corn rough dwarf disease, and Fuping is dominated by corn dwarf mosaic virus 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 maize varieties used in current production are basically not resistant to viral diseases, and comprehensive prevention and control is mainly carried out by controlling the occurrence of pests in the media through pest control and disease control. Due to the recent high temperature of drought, it is conducive to the reproduction of insecticide vectors. This year, corn virus diseases have the potential threat of epidemic. At present, corn has been planted, and farmers should take preventive measures to control the occurrence of diseases and ensure the safety of corn production.
First, the symptoms and the law of occurrence
After the onset of corn, yellow and green stripes appeared on the leaves, and the leaves of the diseased leaves showed red and purple leaves and dried off. Poisoning insects have a close relationship with the occurrence and spread of the disease. Aphids, thrips, and brown planthoppers occur in large numbers, with a large number of poisonous insects, which often causes disease epidemics. 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.
Yellow and green stripes appeared on the leaves, and the leaves of the late-stage leaves showed red and purple leaves and dried up. Poisoning insects have a close relationship with the occurrence and spread of the disease. Aphids, thrips, and brown planthoppers occur in large numbers, with a large number of poisonous insects, which often causes disease epidemics. 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.
Second, control methods
To prevent and treat viral diseases, we must adhere to comprehensive prevention and control based on agricultural control and supplemented by chemical control. The core is to control the source of poisons, reduce the number of insects, and avoid hazards.
1, choose resistant varieties.
2. Maize should be planted in an appropriate period so as to avoid the activity of the first generation of SBPH or aphids during seedling stage.
3. Remove weeds from fields and fields, eliminate poisonous sources and insects, and reduce damage.
4. Strengthen field management combined with seedlings and Dingmiao, remove diseased plants in the field, concentrate deep or burn, and reduce the sources of infestation. Scientific fertilization, watering, strengthening of field management, promoting robust growth of corn, shortening the period of disease, reducing the chance of transmission, and enhancing the resistance of corn to disease resistance.
5. Chemical control (1) For the prevention and control of Laodelphax septentrionalis, thrips and aphids at seedling stage, 10% imidacloprid wettable powder 3000-5000 times liquid or 25% fluocaine wettable powder 1000-1500 times can be used. The liquid is evenly sprayed, and the prevention and control of nesting, intercropping of corn fields and reduction of poisoned insects should be emphasized. (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 a systemic insecticide, such as 2 kg of corn seed dressing with 25% pymetrozine 5 to 8 g of the mother liquor (appropriately watered with 1 kg corn seed to 50 g), or 60 % Imidacloprid Suspension (Gao Qiao) 2kg seed/8ml agent/water 24ml Seed dressing, dry after sowing, can prevent and control corn borer, aphid, and thrips in corn seedling stage, so as to control the spread of corn virus disease the goal of.
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