Appropriate sowing and control of corn rough dwarf
Maize rough dwarf disease is an important viral disease in maize production area in northern China. The disease is transmitted through the planthopper in a persistent manner. It can be infected during the whole growth period of corn, and it is seriously affected by the disease at the seedling stage. After emergence, corn can be susceptible to disease. Generally, symptoms begin to appear at the 5-6 leaf stage, and the heart and leaves are not easily extracted and become smaller, which can be used as the basis for early diagnosis. Beginning at the base of the heart leaf and at both sides of the midrib, a transparent oil-immersed green dotted line is created, gradually spreading over the entire leaf. The leaves of the diseased plant were short and stiff, with dark green leaves and thick internodes. The top leaves were clustered like a clivia. Leaf veins, leaf sheaths, and temporal lobes have waxy white sticks on the veins of the leaves, showing a noticeable roughness. From the 9th to the 10th leaf stage, the dwarfing phenomenon of the diseased plants was even more pronounced. The upper internodes were short and swollen, and the top leaves were clustered. The diseased plants were less than half the height of the healthy plants, and most of them were not able to produce heading and fruiting. Although some tassels could be extracted, Very few branches, no pollen. Ears are misshapen, with few filaments, severe dwarfing of plants, degeneration of tassels, and abnormal ear formation. In the production, maize seed coating is used to coat corn seeds. When there are few fly hoppers, it can control the direct damage of the planthopper at the seedling stage of corn, kill some of the transmission poisonous pests, cut off the transmission route of the disease, and reduce the disease. occur. However, when large scale insects were encountered, the insecticides in the seedlings could not kill all the planthoppers and could not fully control the occurrence of rough dwarf diseases. Therefore, the most effective method for preventing and treating the diminutive disease is to adjust the sowing date of maize so that the seedlings avoid the migration and transmission peaks of Laodelphax striatellus before the 6-7th leaf stage. The disease resistance of the seedlings increased after 6 leaves. Suitable early sowing of spring maize (in late-April) suitable for late summer sowing of corn (around June 15) can avoid the peak of the transmission of SBPH (from the end of May to the middle of June), greatly reducing the occurrence of rough dwarfs The incidence. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone Professional aging products are based on "knowing the old and understanding the old". The design of aging products should meet the real needs of the elderly, facilitate the care needs of nursing staff, and adapt to the home-based elderly care environment.
Third, the chair should have some weight, and 3-4 kg is the best. If it is too light, it is difficult to maintain certain stability and easy to slip. The chair material should not be too soft.
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The characteristics of the elderly are aging of the lumbar spine, discomfort of the cervical spine, osteoporosis, and fatigue. Therefore, it is particularly important for the elderly to protect the waist and neck to delay the aging rate and reduce the incidence of diseases and accidents.
First, the backrest of the Chair is large and strong, and it is equipped with armrests, so that the waist of the old man is close to the back of the chair and can support the head and shoulders of the old man.
Second, the height of the chair should be at the same level as the knee, that is, when the old man is sitting, his feet can be placed flat on the ground. At the same time, the length of the chair seat should be the same as the length of the old man's hip to knee, so that the knee joint can be maintained at about 90 degrees, and the ankle joint can be in a natural drooping rest state.