China News Service, March 11 According to the website of the Ministry of Agriculture and Rural Affairs, the National Agricultural Technology Center released on the 11th the technical plan for the prevention and control of Spodoptera frugiperda (hereinafter referred to as the plan).
The plan pointed out that in 2021, the occurrence of Spodoptera frugiperda was mainly concentrated in the Huanghuaihai and southern regions; the Southwest and South China had more generations, the Jiangnan and the middle and lower reaches of the Yangtze River were moderately occurring, and the Jianghuai, Huanghuai, Northwest and North China regions were lighter. Occurrence, the estimated area of insect sighting is 40 million mu.
In terms of prevention and control goals, the plan proposes to achieve "two guarantees", that is, to ensure that the areas where the insect population meets the standard should be fully prevented, and to ensure that the occurrence area is not large and contiguous.
The prevention and control treatment rate is over 90% overall, the prevention and treatment rate in the recurrence area is 100%, and the overall damage loss is controlled within 5%.
In terms of prevention and control strategies, in accordance with the strategy of focusing on the annual breeding area, controlling the migration transition area, and protecting the main corn-producing area, strengthen the "three-zone" joint defense and the "four-zone" deployment and control, and intercept and trap the migrating adult insects at all levels to prevent early and effective treatment. Small, comprehensive culling of larvae, minimizing damage and loss.
Highlight major crops, key seasons, and key areas, strengthen unified defense rule and regional joint defense, and implement prevention and control guidance tasks.
The plan proposes three prevention and control measures.
One is monitoring and early warning.
Set up key monitoring points in the border areas of Southwest and South China and migration channels to monitor the number and dynamics of adult migration by combining high-altitude observation lights and ground-based insect status observation lights.
In the middle and lower reaches of the Yangtze River, Huanghuaihai, Northeast and Northwest regions, light traps and sex traps were carried out to monitor the occurrence of adults.
Focusing on corn, taking into account important host crops such as sugarcane, sorghum, and wheat, conduct field surveys during the crop growing season, especially the seedling and heart leaf stages, to ensure early detection and early control.
The second is the focus of district prevention and control.
The South China and Southwest China annual occurrence areas prevent and control the source of imported insects, strengthen the trapping of adult insects, strengthen the control of field larvae, curb local breeding and reproduction, and reduce the number of emigrating insect sources; the Yangtze River Basin and Jiangnan area will focus on culling the imported populations, trapping and killing adults, Cull local larvae and reduce the base of transit insect sources; Huanghuaihai and northern areas focus on protecting corn production, strengthen the monitoring of migratory adults, and focus on the prevention and control of young larvae.
The third is the main technical measures.
In terms of ecological control technology, focus on the annual occurrence area of Spodoptera frugiperda and the early migration area of foreign insect sources, and strengthen biological and ecological preventive measures.
Scientifically select and plant insect-resistant varieties. At the same time, intercropping beans, onions, melons and other plants that are repellent to pests can be intercropped in corn fields, or sweet waxy corn insect traps can be planted in batches on the side of the field to avoid pests or eliminate them in a concentrated manner. , Reduce the amount of insects in the field.
In terms of seed treatment technology, prior to sowing, seed coating agents containing chlorantraniliprole, bromoyl·thiamethoxam and other ingredients are selected for seed coating or seed dressing to prevent Spodoptera frugiperda at the seedling stage.
In terms of physical and chemical trapping technology, during the peak period of adult occurrence, physical and chemical trapping measures such as high-altitude insecticidal lamps, sex traps, and food attractants are adopted to trap adults, interfere with mating, and reduce the amount of eggs laid in the field.
In the concentrated contiguous planting area, the standard of setting one trap per mu (centralized contiguous use, with an area of more than 1000 mu, can be set according to the standard of 1.5-2 mu per trap), and the application of attractant traps and kills adults during the whole growth period .
The setting density of traps in fields, corners, and weed distribution areas can be appropriately increased.
In the seedling stage, the trap entrance is 1 to 1.2 meters away from the ground, and in the later stage it is 15-25 cm higher than the top of the plant. As the crop grows, attention should be paid to adjusting the height of the trap.
During the period of use, according to the duration of the lure, replace the lure in time to achieve the best trapping effect.
In terms of biological control, during the whole growth period of crops, pay attention to the protection and use of parasitic natural enemies such as Noctuidae, Diadema semi-closed-tailed, Parasitidae fasciatus and predatory bugs, East Asian flower bugs, Lacewings and ladybirds. For natural enemies, flowering plants are planted on the edge of the fields to create an ecological environment conducive to the habitat of natural enemies.
Actively carry out the artificial release of Trichogramma and other natural enemy insect control technology during the egg stage of Spodoptera frugiperda.
Grasp the young larval stage, use Bacillus thuringiensis, Brassica napus nuclear polyhedrosis virus, Metarhizium anisopliae, Beauveria bassiana and other biological pesticides to spray or broadcast to continuously control the population of Spodoptera frugiperda.
In terms of scientific drug use, on the basis of comprehensive prevention and control measures such as sexual trap prevention and control during the whole growth period, and according to the results of insect investigation and monitoring, when the rate of damaged maize plants or the amount of young larvae in the field reaches the control indicators (corn seedling stage, big horn The control indicators for the oral stage and adult plant stage are respectively 5%, 20% and 10% of the injured plant rate. For fields with overlapping generations, long duration of damage, and multiple application of pesticides for prevention and control, 10 insects per 100 plants can also be used. Indicators), can choose to use emamectin benzoate, spinetoram, chlorantraniliprole, chlorantraniliprole, indoxacarb, lufenuron, tebufenil and other high-efficiency and low-risk pesticides , Pay attention to spraying key parts such as heart leaves, tassels or female ears.
Pay attention to the alternate use, rotation, and safe use of pesticides, delay the emergence of drug resistance, and improve the effectiveness of prevention and control.