How to prevent wheat red dwarf disease?
(1) Selection of resistant varieties: Selection of resistant varieties is an effective economic measure for prevention and control of red dwarf diseases. All localities should be selected according to local conditions.
(2) Cultivation measures: timely sowing, avoiding early sowing; strengthening weeding and weeding, as well as eradicating weeds on the ground, reducing poisonous plants and reducing the number of leafhoppers.
(3) Control of insects and diseases: It is possible to use pesticides to treat seeds and prevent spraying at the seedling stage. 1 Seed dressing with 3911, 200 grams per 100 kilograms of seeds, add 6-8 kg of water, spray the seeds, and strive to be uniform, then suffocate for 12 hours, then you can sow. 2 spray at the seedling stage, spray with 80% dichlorvos emulsifiable concentrate lOOO solution, or 40% dimethoate emulsifiable concentrate 2000 times
Human chorionic gonadotropin is a hormone for the maternal recognition of pregnancy produced by trophoblast cells
Human chorionic gonadotropin (HCG) is a glycoprotein secreted by trophoblast cells of the placenta And β dimer proteins. The molecular weight of glycoprotein hormone 36700, A. Pituitary, FSH, follicle stimulating hormone, LH (luteinizing hormone) and TSH (thyroid stimulating hormone) are basically similar, So they can cross-react with each other, while the structure of β subunit is not similar. In mature women, the fertilized ova move to the uterine cavity for implantation and form embryos. In the process of development and growth into the fetus, the placental syncytiotrophoblast cells produce a large amount of HCG, which can be excreted into urine through the blood circulation of pregnant women. Serum and urine HCG levels rise Rapidly from 1 to 2.5 weeks of gestation, reaching a peak at 8 weeks of gestation and dropping to moderate levels at 4 months of gestation, which remain at the end of gestation. At present, the commonly used detection methods are: latex aggregation inhibition test and hemagglutination inhibition test; Radioimmunoassay (RIA); Enzyme linked immunosorbent assay (ELISA); Monoclonal antibody colloidal gold test
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