Recent monitoring by the National Monitoring and Reporting Network shows that
The number of adult grass moths has increased significantly,
The insect population density in the local area of southwest China is large, and the insect source base is high.
In order to strictly prevent the outbreak of the grassland night moth,
Ensure a bumper harvest of important food crops such as corn.
All localities attach great importance to analyzing and judging the current situation.
Arrange deployment prevention and control work.
so
What kind of insect is the meadow moth?
What are the harmful consequences?
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Let's take a look
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What kind of insect is the meadow moth?
The grassland night moth, commonly known as the autumn armyworm, is an omnivorous pest and is one of the top ten plant pests in the world. The moth's hatched larvae prefer to eat more than 80 kinds of plants such as corn, sugarcane, sorghum, potatoes, etc., and generally reduce yields by 20%-30% after being harmed, resulting in harvest failure when severe. Native to the tropical and subtropical regions of the Americas, it has the characteristics of wide range of suitable growth, fast transmission speed, strong reproductive capacity and heavy damage. It invaded Africa from the Americas in 2016 and introduced to Asia in 2018, with more than 100 insect pests in more than 100 countries around the world, making it a major agricultural pest of the Global Alert of the Food and Agriculture Organization of the United Nations.
What are the harmful consequences of the grassland nightcrawler?
The grassland moth is a major migratory pest on corn, and the damage at the seedling stage of corn can generally reduce yield by 10%-25%, and serious damage to the field can cause the destruction of seeds and harvests. In fact, the reproductive ability of the grassland moth far exceeds that of the corn borer, the number one pest of the current corn, and the adult moth can fly 100 kilometers per night, and has the characteristics of high reproduction multiples and heavy damage from hatched larvae, and the control pressure is huge.
What are the prevention and control measures for the grassland moth?
1. Monitoring and early warning: Set up key monitoring points in the border areas of southwest and south China and the migration and flight channels, and monitor the number and dynamics of adult insect migration and flight in combination with high-altitude monitoring lights and ground insect situation monitoring lights. In the middle and lower reaches of the Yangtze River, Huang-Huai-Hai, northeast and northwest Regions, lamp-inducing and sexual attraction were carried out to monitor the occurrence of adult insects. Focusing on maize, taking into account important host crops such as sugarcane, sorghum and wheat, field surveys are carried out during the crop growing season, especially at the seedling and heart leaf stages, to ensure early detection and early control.
2. Zonal prevention and control: prevention and control of migratory insect sources from abroad in the anniversary areas of South China and Southwest China, strengthen adult traps, strengthen field larval control, curb local breeding, and reduce the number of migrating insect sources; The Yangtze River Basin and Jiangnan region focus on culling migratory populations, booby-traping adult insects, culling local larvae, and lowering the source base of transit insects; Focusing on the protection of maize production in the Huang-Huai-Hai and northern regions, the monitoring of migratory adults has been strengthened, and the control of young larvae has been mainly focused.
How does the Meadow Moth kill?
1. Physical and chemical booby-trapping. During the peak period of adult insect occurrence, physical and chemical enticing measures such as high-altitude insecticidal lamps, sex traps and food attractants are adopted to trap adult insects, interfere with mating, and reduce the amount of eggs falling in the field. In the concentrated contiguous planting area, according to the standard of setting up 1 trap per mu (centralized contiguous use, an area of more than 1000 mu, can be set according to the standard of 1.5-2 mu 1 trap) The whole growth period of the application of a trapper to trap adult insects. Trap setting density in field edges, corners, and weed distribution areas can be appropriately increased. The trap inlet at the seedling stage is 1-1.2 meters from the ground, and in the later stage, it is 15-25 cm higher than the top of the plant, and as the crop grows, attention should be paid to adjusting the trap height. During the period of use, according to the effective period of the lure core, the lure core is replaced in time to achieve the best booby trap effect.
2. Biological control. During the whole growth period of crops, attention should be paid to the protection and utilization of parasitic natural enemies such as nocturnal moth black egg bees, semi-closed curved tail bees, pale-footed lateral furrow cocoon bees, and predatory natural enemies such as beneficial bugs, East Asian small flower bugs, large grasshoppers and ladybirds, and plant flowering plants on the edge of the field to create an ecological environment conducive to the habitat of natural enemies. Actively carry out pest control techniques for artificially releasing natural enemies such as red-eyed bees during the egg stage of the grassland nightcrawler. To grasp the young larval stage, the number of grassland moths was continuously controlled by using biopesticides such as Thuringiensis, Kale noctus nucleo-type polyhedral virus, Scarab green zombie, and Coccidioides albicans.
3. Scientific drug use. On the basis of the implementation of comprehensive prevention and control measures such as sexual inducement prevention and control during the whole growth period, according to the results of insect investigation and monitoring, when the field maize pest rate or the amount of young larvae reach the control index (the control indexes of maize seedling stage, large horn stage and adult stage are 5%, 20% and 10%, respectively), for fields with overlapping generations, long duration of harm, and multiple applications for control, the indicator of 100 insects can also be used), and the indicator of 100 insects can also be used), and methylaminoaminosamilbenzoate, ethyl polybactericide, chloranthramide, High-efficiency and low-risk pesticides such as tetrachlorofuranamide, indate, lice urea, and insect mite nitrile, pay attention to key parts such as heart leaves, male spikes or female spikes. Pay attention to the alternating use, rotational use and safe use of pesticides, delay the generation of drug resistance, and improve the prevention and control effect. \
Source: Comprehensive Report