Since the end of July, due to the impact of the climate, the three generations of corn in the eastern part of Inner Mongolia, the northeastern part of China, and most of North China have serious damage. The reporter learned from the National Agricultural Technology Center that there were 100 million mu of sticky insects in the 2nd and 3rd generations this year. The prevention and control of the armyworm is focused on the prevention in the early stage. Due to continuous rainfall during the prevention period this year, the best prevention period was missed, resulting in a three-generation armyworm outbreak. Zhou Puguo, deputy director of the Department of Planting of the Ministry of Agriculture, said that in early August, the national armyworms broke out one after another. The re-launched fields can generally reach 100 to 500 heads, the highest is 2000 to 2500 heads, and the national “two-shift†pests have occurred 300 million. In the case of acre, the area is large and the range is wide, and the density is rare in the past ten years.
Corn is a high-crop crop, especially growing to more than 2 meters, difficult to apply, can be combined with high-end agricultural machinery spraying to prevent and control, the effect is more significant. Mucoids explode quickly and have a short cycle, which easily affects corn yield and causes corn price fluctuations. All local units are fully cooperating and strive to control the insects in a short period of time.
Stickworm outbreak is due to rain temperature
Wang Yiwu, dean of the Agricultural College of Jilin Agricultural University, analyzed that climatic conditions are an important factor in the induction of armyworm disasters. Because this year in the central part of Jilin Province, the rain is relatively abundant, the soil moisture and the field humidity are relatively large. In early August, the temperature in Jilin Province was 20 degrees lower than in previous years. Such climatic conditions are most suitable for the growth and development of armyworms.
It appears in Jilin that it is "second-generation armyworm", while in Hebei it is "three-generation armyworm".
Zhang Shumin, deputy director and researcher of the Plant Protection Station of the Agricultural Department of Hebei Province, said that the armyworm disaster in Hebei was directly related to the “7.21†heavy rain. Several factors came together, which led to the occurrence of the armyworm disaster. Because the severity of this year is What has not been seen in the last 20 years, if there is no heavy precipitation in late July, there is no sinking airflow. At that time, its ovarian development is not mature. It is a passerby. The time of the airflow and its development progress are in agreement with us.
Quick action emergency relief
In the northeast and north China, corn can only be harvested before and after the National Day. If the armyworm disaster cannot be controlled, serious areas may face production cuts.
The Liaoning Provincial Party Committee and the provincial government decided to allocate 10 million yuan of special pest control funds. At present, large-scale prevention and control actions have been carried out throughout the province, and a large number of personnel have been organized to conduct pull-net censuses, timely issue early warnings, and dispatched more than 14,000 yuan. People, nearly 8,000 sets of machinery and equipment in the first line of prevention and control, the daily control operation area of ​​700,000 acres.
Zhang Shumin, a researcher at the Hebei Provincial Department of Agriculture, said that the Agriculture Department coordinated 20 million and urgently purchased 8,460 units suitable for corn high-crop crop field application of smoke machines. Up to now, one helicopter has been used, and more than 400 large-scale application instruments have been used. More than 2,000 machines have been completed, and now it has completed 5.45 million mu of re-issuing areas.
Rational drug use is the key
Because it is the outbreak period of the second and third generations of sticky worms, the prevention period has passed, so the most direct method is to spray pesticides and carry out chemical defense. Because corn leaves are heavily foraged, farmers are eager to kill insects during the application process, blindly overdosing, or even multiplying the amount of application. However, because the application period is wrong, the corn is too high, and the liquid falls into the nose when sprayed, often causing Self-poisoning, now the elderly and women in rural areas are generally poorly resistant. Therefore, we must adhere to the principle of scientific drug use and ensure the health of corn in the case of self-safety.
1. Period of application
It is best to spray the medicine before 10 o'clock and after 3 o'clock in the afternoon, avoiding the high temperature time, and also killing the mucus in a wide range of activities.
2, pesticide selection
10% acitretin suspension, 14% a vitamin salt suspension, 20% chlorantraniliprole have a good effect. In addition, you can also choose 90% crystal trichlorfon 100~120g/mu, 45% malathion EC 80~100ml/mu, 25% diflubenzuron wettable powder 6~20g/mu, 25% chlorhexidine suspension 40ml / mu, 8000IU / mg Bacillus thuringiensis emulsion 200ml / acre, 40 ~ 50kg of water to prevent. When the pests occur seriously, the interval is 7~10 days, and even spray 2~3 times.
Special attention: Do not promote the application of pesticides such as dichlorvos. Although it has the characteristics of rapid anti-virus and no residue, the fumigation effect of dichlorvos is extremely poisonous. If you have any symptoms during the prevention and treatment process, you must seek medical advice promptly.
other information:
Conditions of occurrence of armyworms: 1 Adults lay eggs at a suitable temperature of 15~30 °C. In the years with many rains, the armyworms often occur; 2 in the early spring, there are many first-generation larvae. The larvae like to eat grasses, develop faster after feeding, and have larger sputum, and the adults are more robust. The key to the prevention and control of slimeworms is to make predictions and predictions. Before the 3rd instar larvae, it is best to eliminate the sticky insects in the eggs. In the egg hatching period until the larva 3 years old, timely spraying of pesticides has good control effect.
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