Prevent Rice Stripe Blight

According to the forecast of the plant protection department, outbreaks of rice stripe disease in Jiangsu Province in 2005 are still outbreaks. Reviewing and summarizing the prevention and treatment of rice stripe disease in the past, we found that there are misunderstandings in different degrees in the selection of rice varieties, planting methods and methods of application. Mistakes in the selection of varieties that can replace the anti-rice leaf stripe disease varieties can sit back and relax. Rice stripe disease is a new serious disease in our province in recent years. Although some disease-resistant varieties appeared in production, some disease-resistance varieties have poor comprehensive resistance and are easy to lodging. The quality and yield potential are not ideal. The selection of rice varieties should adhere to the principles of high quality, high yield, and high (high) resistance, taking into account the relationship between resistance and high quality and high yield, and rational use of local conditions. In the old locust area of ​​rice stripe disease in Central Jiangsu, Fengyou Xiangzhan, Yangjing 9538, Yanjing No. 5, Ningjing No. 1 and other varieties with good resistance to disease can be selected; in areas with light incidence and high commodity rate, comprehensive resistance is selected. , high-quality, high-yield varieties. The misunderstanding of planting patterns attributed the incidence of rice stripe disease to planting patterns. It was considered that the occurrence of direct seeding rice fields and seedling-planting rice fields was light, and that of hand-planted rice fields and wheat-planted rice fields was heavy. Although different planting methods, sowing dates and farming practices will affect the time and number of populations of a generation of Laodelphax striatellus, thus affecting the incidence of rice stripe disease, the key is whether it can be used when adopting various planting methods. Period control. Large-scale production practices in 2004 showed that the incidence of direct-seeded rice fields and thrown rice fields was severe, resulting in reduced yields and even no harvest. The extent of damage caused by rice stripe disease depends on the quality of control, not planting methods. The probability of rice late-seeding suffering from rice stripe disease is lower, but not too late, so as not to shorten the growth period of rice and reduce the yield. Misuse of medication methods (1) The more effective the control of pesticides is, the more toxic and highly-residual pesticides are banned by countries such as methamidophos and carbofuran. The use of these banned pesticides not only kills pests but also kills a large number of beneficial natural enemies. Some highly toxic pesticides not only have poor efficacy but also stimulate the proliferation of pests. For example, a rice field in Wubao Village, Baimi Town, Jiangyan City, was sowed with furamidine before sowing, and was treated with methamidophos after sowing. There were 18 adult nymphs and 5 nymphs per square meter of paddy field, and the rice stripe disease incidence rate was Up to 20%. (2) The patients are rushed to the doctors, and some even spray penicillin, streptomycin, tetracycline, and cracks to the rice. The results not only increase the cost of medication, but also delay the appropriate period of prevention and treatment. Rice stripe disease is a virus disease, there is no specific drug for prevention and cure. Only through the prevention and treatment of wheat fields, the base number of Scutellaria barbata is reduced, the disease is controlled in Datian field, and the field is protected in the late stage of Datian field to cut off the toxic source. The drugs should be selected from the group consisting of fipronil, imidacloprid, and dichlorvos. Wait. (3) Regardless of the appropriate period of prevention and treatment, blindly increase the number of medications, use "five days a fight drugs", "a seven days a fight drugs." Prevention of Laodelphax striatellus should be used to control scientific drugs during appropriate period. In the middle and late April, the wheat field can control the old nymph of Laodelphax striatellus. In the middle of May, it controls the generation of nymphs of SBPH; in paddy fields, it can control the migration of adult migratory locusts in the early June (after the wheat field), and it is controlled in mid-June. The second generation nymph of Laodelphax striatellus was used to control three generations of nymphs of SBPH in mid-July. (4) Irrespective of whether there is a water-free layer in the field, spraying or improper control measures such as fine spray, coarse spray, and toxic soil are used, thereby affecting control efficiency. According to the characteristics of pesticides, pest habitat characteristics and age of insects, a reasonable choice of drug use. During the egg hatching period and vigorous growth period of the planthopper, the system should adopt the systemic long-acting pesticide spray; the late stage of the wheat nymph stage at the late growth stage should be fumigated with dichlorvos mixed soil; the control in the field and field stage should be long. Efficacy and quick-acting compound preparations, maintaining the water layer in the field to ensure efficacy.

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Calcium carbonate is a kind of inorganic compounds, chemical formula optimization for CaCO ₃, commonly known as grey stone, limestone, limestone, marble, etc. Calcium carbonate is neutral, basically insoluble in water, soluble in hydrochloric acid. It is one of the common substances on the earth. It exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocks. It is also the main component of animal bones or shells. Calcium carbonate is also an important building material and is widely used in industry.

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