Corn rough dwarf disease is a viral disease caused by Laodelphax striatellus as a transmission medium, and the pathogen is a corn roughage virus. The disease is caused by the poisonous adult of Laodelphax striatellus or nymphs wintering in wheat, greenhouses, or weeds in the field, and in the second year from May to June, poisonous hoppers migrate from wheat and rice fields one after another. To the recent spring and summer sowing cornfield transmission of toxic hazards, resulting in the occurrence of corn rough dwarf disease. One, far away from the rice planted areas in Putian District. Since paddy fields in rice are the main target areas for the damage of rice planthoppers, paddy rice fields are also the main gathering place for rice planthoppers. The density and insect population are high. Surveys have shown that the amount of fly aphids in rice fields in Donghai County is as high as 20 per square foot. The amount of corn fields and fly locusts near Putian is also relatively high, and the probability of contracting the corn roughage virus is also relatively large. Therefore, it is necessary to keep corn far away from the paddy field and reduce the transmission rate of SBPH. Second, choose a safe sowing period to avoid the age of diseased corn. The spring corn or wheat stubble corn, not the semi-summer corn (ie, from mid-May to early June), made the sensitive leaf age of the maize staggered with the peak of the adult population of the Laodelphax striatellus. The sowing of spring corn should ensure that the leaf age is more than 10 leaves before the end of May, and the summer corn after sowing will be sown after June 5, which will stagger the peak of SBPH at the seedling stage. Third, plant resistant corn varieties. Planting disease-resistant maize varieties such as Ludan 50, Suyu 9 and Zhongyu 4 can significantly reduce the incidence and incidence of maize rough dwarf disease, which can be 20-50% lighter than the same period sown Dandan 13 but resistant varieties. Can still be sick, must be combined with safe sowing of corn sowing, control effect can be more ideal. Fourth, drug seed dressing control SBPH. With imidacloprid mixed with corn, the control effect of Laodelphax striatellus can reach more than 1 month, and effectively control the amount of Laodelphax striatellus occurring at the seedling stage of corn, so as to achieve the purpose of controlling the spread of corn roughage virus. In general, the effective amount of imidacloprid per acre is 0.5 g and 3.5-4 kg of corn are mixed. V. Grasping a critical period of time and comprehensively preventing and controlling poisoning insects. The first is in the early May of the generation of the low-instar nymph of the generation of S. macrophylla, and the second is the transfer period of S. falciparum before the harvest of wheat and rape, ie from late May to early June. Use 5% efficient Da Gongchen or 50% WP WP 20 g/mu or 25% TCQ EC 40 ml/mu to spray wheat, rapeseed field, and field hoe, head, and ditch side weeds. Use 1-2 times for each time period to fully suppress the population of SBPH. Sixth, the use of drugs to prevent and treat corn rough dwarf fields. In the early stages of the development of corn rough diseases, virus control agents and virus inhibitors, such as phytophthora or viral special killing agents, are sprayed in time to enhance the disease resistance of plants and reduce the degree of morbidity. Seventh, comprehensively strengthen prevention and control of rice planthoppers in the field, and lower their total amount. Using a combination of unified control, comprehensive prevention and control, and quick-acting pharmaceuticals combined with long-acting pharmaceuticals, a unified prevention and treatment of 2-3 times in the occurrence stage of SBPH.
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