First, the incidence of symptoms of corn rough dwarf disease commonly known as "evergreen corn" "Ginger and corn", from the corn seedling stage to tasseling period can occur, but the seedling stage is the most likely to occur. The main feature of corn after rough shrinkage is that the back of the heart, leaf sheath and temporal lobe all produce white, yellow or dark brown waxy protrusions. The earlier the disease, the heavier the damage. The seedlings were affected. The diseased plants were dark green, with less roots, and dwarfed plants. Generally, they did not show heading, and the tassels were severely degraded. No ears or ears were extremely small and were not strong. In the adult plant, the internodes in the upper part of the plant were shortened, the axis of the spike was shortened, the ear was short, and the fruit was small.
Second, the cause of the disease Drosophila virus can not pass the seeds, soil and contact infection, can only be transmitted by poisoning of Laodelphax striatellus. (a) High temperatures in the winter and early spring temperatures rise back to early winter, which is conducive to the wintering and breeding of the brown planthopper, and the incidence is heavy. (2) There are many poisonous weeds in the field, and there are a large number of poisonous insects. The natural poisoning rate is high, which can easily cause diseases. (C) There was a significant difference in disease resistance among the varieties. The hard grain type was resistant to disease, the intermediate type was the second, and the horse tooth type was susceptible to disease. (d) Due to the warm winter of last year and the severe drought this year, the occurrence of wheat bush dwarf disease has made the base of the planthopper very large. Therefore, the occurrence of rough corn disease in summer can be prevalent and the prevention and treatment work can not be delayed.
Third, the prevention and treatment methods to prevent and treat corn rough dwarf disease should be started as early as possible, if you wait until the corn after the disease prevention and control of spraying, it is too late. Correct prevention and control methods: (a) Select disease-resistant varieties. (2) Suitable sowing, try to avoid the activity of the first generation adult of Laodelphax striatellus (in late May in the first half of June). Remove weeds from fields and fields, and reduce habitats and sources of poisoning. (3) Combining pesticide spraying with corn to enclose the herbicide and adding 30% of acephate and other insecticides to achieve the purpose of killing insects such as Laodelphax spp. inhabiting wheat straw. (d) Before 80% of the corn had been unearthed, 30 grams of acephate (50 ml) plus 10% of imidacloprid (20 grams) was used per acre to spray 30 kilograms of water across the field. When there are 2 to 3 leaves of corn, the use of the above-mentioned agents at the same time to add regulators such as Green Wind 95, field helper, etc., and then spray 1, can effectively prevent the occurrence of corn rough shrinkage.
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Agar-agar is a natural vegetable gelatin counterpart. White and semi-translucent, it is sold in packages as washed and dried strips or in powdered form. It can be used to make jellies, puddings, and custards. For making jelly, it is boiled in water until the solids dissolve. Sweetener, flavouring, colouring, fruit or vegetables are then added and the liquid is poured into molds to be served as desserts and vegetable aspics, or incorporated with other desserts, such as a jelly layer in a cake.
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