Maize rough dwarf disease is a devastating disease caused by the corn roughage virus. At present, it is difficult to control once it is popular due to the lack of effective drugs. The severity of corn rough dwarf disease is closely related to the number of SBPH, the rate of infection, and the sowing date of corn. Due to a variety of factors, this year may lead to partial occurrence of corn rough dwarf disease and should be given sufficient attention. It is hoped that the majority of peasants will have to pay attention to the inspection and management of SBPH to prevent corn rough dwarf disease.
Based on: 1, this year's wheat harvest ahead of schedule, so that the sowing date of summer corn earlier than normal 3-5 days, Laodelphax striatellus transmission time and corn seedlings high degree of coincidence, increased the probability of transmission.
2. Since this year, the temperature has continued to be high, and the meteorological drought has been relatively heavy. As a result, the occurrence period of Laodelphax striatellus has been earlier than usual. The occurrence of Laodelphax striatellus is 20-30% higher than that of normal years, and the number of worms is high.
3. At the same time, according to meteorological department's forecast, the average temperature in June is close to normal, and the amount of precipitation is the same as that of the normal year. The recent temperature is 18-26 degrees, which is very suitable for the occurrence of SBPH.
4. The current emergence of maize partially reached the three-leaf stage and entered the susceptible period. Therefore, we must take measures to do a good job in prevention and control.
Control methods:
1. Promote seed coating
When sowing, 70% thiamethoxam seed treatment agent or 10% imidacloprid wettable powder soaking, have good control effect on the seedling stage Laodelphax striatellus, thrips, can greatly reduce the disease rate of corn rough dwarf disease.
2. timely pest control and disease prevention
After corn emerged to the 5-leaf stage, it was applied once every 5-7 days and used twice. The agent can be controlled with 10% imidacloprid 15-20 g. Grasping this critical period of prevention and control, we will carry out specialization and defense against the rule, unify the time, concentrate on spraying medicine, early prevention, general defense, and strong prevention, and can achieve better pest control and disease prevention.
3. Strengthen field management
Timely eradication of weeds in corn fields and fields destroys the living environment of Laodelphax striatellus; strengthens management of fertilizer and water in corn, promotes robust growth of corn, and enhances its resistance to diseases; early detection of diseased plants and the timely removal of diseased plants. Outside the field is buried or burned.
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