Mythimna separata is a migratory and fulminant omnivorous pest. Since late July, the northeast and north China have frequent rainfall and moderate temperature, and the climatic conditions are particularly suitable for the centralized migration and occurrence of armyworm. In early August, Tongliao and Chifeng in Inner Mongolia, three generations of larvae in Langfang, Tangshan, Baoding, Zhangzhou, Qinhuangdao, Beijing, Tianjin, and Shanxi and Shanxi Provinces were successively outbreaks. The area, size, and density of these larvae have been seldom seen for nearly 10 years. It poses a serious threat to the production safety of autumn crops such as corn, millet and rice. According to statistics, the second and third generation of the country's second-generation armyworm has an accumulated area of ​​nearly 100 million mu. The third-generation armyworm is still expanding its scope. To effectively control the risk of armyworm, the Ministry of Agriculture has formulated this guidance.
First, control strategy
For the rapid propagation of the armyworm, short-term outbreaks, increased food intake after 3rd instar, and increased resistance to insecticides, the prevention and control of adult pests should be taken. During the period of prevention and treatment, centralized re-governed areas of re-emergence, isolation and prevention of local high-density areas, control the re-infestation of pests in the field, close monitoring of the general area, the point of the film over the prevention and control indicators in a timely manner" strategy.
Second, prevention and control technology
(I) Control adult worms and reduce spawning. By using the adult spawning habits, phototaxis, and chemotaxis of adult armyworms, adult insects were trapped and killed by cereal straw, sweet and sour liquid, sexual traps, and insecticidal lamps to reduce the amount of adult eggs laid and reduce the density of insects in the field.
1. Valley straw law. Generally, a straw with a diameter of 5 centimeters is inserted into 60 to 100 per acre. The grass handle is changed for 5 days, and the replaced subtilis grass is burned to eliminate adult armyworm.
2. Sweet and sour method. Take brown sugar 350 grams, 150 grams of wine, vinegar, 500 grams, 250 grams of water, plus 90% of the crystal trichlorfon 15 grams, made of sweet and sour liquid, placed in the field 1 meter high trapping adult armyworm.
3. Sex trapping method. Using a dry-type inducer equipped with an armyworm-inducing attractant, one rod per acre was hung in a corn field to induce adult oviposition.
4. Insecticidal lamp method. During the adult mating and spawning period, insecticidal lamps were placed in the field. The distance between the lamps was 100 meters, and the lamp was switched on from 8 o'clock in the evening to 5 o'clock in the morning to trap and kill the adults.
(b) Prevention and control of larvae and mitigation of hazards. In the early stage of larvae, spraying and controlling were performed, and the larvae were eliminated before the third instar.
1. Meet the standard prevention and treatment. When the population density of the rice field is 25 to 30 heads per square meter, and the density of the corn field is 30 heads per hundred or more, 50% of phoxim, 80% of dichlorvos, and 40% of chlorpyrifos can be used per mu. ) Emulsifiable concentrate, 75~100g water, 50kg or 20% diflubenzuron 3 suspension or 25% cyanocyanine 20~30ml or 4.5% beta-cypermethrin 50ml water 30kg uniform spray, or 5% cinnamicin Ester (benzolate) emulsifiable concentrate, 5% fenvalerate (Laurel) EC, 2.5% lambda-cyhalothrin (Kung Fu) EC, 2.5% deltamethrin (enemy) EC 1000 ~ 1500 times Liquid, 40% omethoate 1500 ~ 2000 times, 10% imidacloprid 2000 ~ 2500 times spray control.
2. Early prevention and treatment. In the young instar larvae stage, 5% can be used to kill 4,000 times solution of emulsifiable concentrate, diflubenzuron 1, diflubenzuron 2 or diflubenzuron 3, 500-1000 times spray control, which is effective in controlling armyworm larvae and does not kill natural enemies. .
3. Note. The spraying time should be before 9:00 am or after 5:00 pm on a sunny day. If it is rainy, it should be sprayed in a timely manner. The spray should be even and thorough, and the field must be sprayed. Weeds must be sprayed on the roadside. When the age of the insect is large, the dosage should be increased. In the case of a particularly large amount of insects, the plants can be beaten first to shake off the armyworm off the ground, and then sprayed on the ground, which can receive good results. Insects that invade corn heads can be controlled by applying an inhalation solution. Spraying machines can use self-propelled high-stalk crop sprayers, air-fed sprayers or smoke sprayers. Wear protective clothing and a mask when spraying.
(c) Build blockades to prevent the transfer. When the armyworm migrates, it can be sprinkled with a 15 cm wide drug tape on the road to be blocked; or in the corn field, use 40% phoxim EC 75 to 100 grams plus the appropriate amount of water and 30 kg of sandy soil. Poisonous soil is applied for isolation.
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