.................. Guang · tell..................
This is a "perverted moth", which is what many people say about it!
How perverted is it? How ferocious?
Fly fast! You can fly 100 kilometers per night and migrate from mississippi to southern Canada in 30 hours, spanning up to 1600 kilometers. You know, flies fly at a speed of 6 to 8 kilometers per hour, and only fly 8 to 18 kilometers a day.
Super Power! A female adult can lay 900-1000 eggs in a lifetime! The common cabbage moth generally lays 100 eggs.
Big Stomach King! Corn, rice, wheat, barley, sorghum... See what to eat, not picky at all. More than 80 kinds of plants around the world are its plate food.
Such a ferocious grass moth, it is no wonder that many people call it the "Invincible Destruction King".
Global warning is highly prepared
The meadow moth, also known as the autumn armyworm, is known internationally as "Spodoptera frugiperda (Smith)". There are more than 300 species of grassland nocturnal moths, which harm many plants, especially corn and rice.
Why does the grass moth cause so much attention? Jiang Yuying, a researcher at the Disease and Pest Detection and Reporting Department of the National Agricultural Technology Extension Service Center, introduced that the grassland night moth has the characteristics of a wide suitable area, strong migration ability, high reproduction multiple, heavy damage from overeating, and great difficulty in prevention and control. "The pest characteristics of the insect itself determine that it is a pest that needs to be highly guarded against." The pest has spread rapidly in Africa and Asia since 2016, with the Food and Agriculture Organization of the United Nations issuing a global warning in August 2018.
Huang Shusheng, deputy director of nanning plant protection station, introduced that the grassland night moth has a large amount of food and is overeating, which can cause great harm to crops. "Young larvae can eat corn leaves and bite off all the heart leaves of corn." At the same time, the adult grassland moth can migrate long distances, easy to spread and spread, and after eating one piece of land, it flies to another piece of land, nicknamed "marching insect".
It was first discovered in Yunnan and Guangxi
The meadow moth originated in South and Central America and subsequently spread to Mexico, the United States and Canada. It first appeared in Nigeria in 2016, invading 44 African countries within two years. From January 2016 to January 2018, the grassland nightcrawler invaded 44 sub-Saharan African countries. It first occurred in India in mid-May 2018, and invasions were detected in Bangladesh, Sri Lanka and Myanmar from November to December of the same year.
On April 4, the National Agricultural Technology Extension Service Center released the 13th issue of Plant Disease and Insect Information "Bulletin on the Occurrence of Grassland Night Moths in China and Neighboring Countries". The circular shows that since January 11, the grassland night moth was found to invade the southwest of Yunnan, China, causing certain harm to winter corn, and has colonized and begun to breed in China, and Yunnan and Guangxi have found that the grassland night moth harms spring corn. As of April 3, the grassland night moth has been found in 31 counties (cities) of 9 cities (prefectures) in Yunnan Province, including Pu'er, Dehong, Baoshan, Lincang, Honghe, Xishuangbanna, Yuxi, Wenshan and Chuxiong, and larvae have been found on some spring maize, the age of the field insects is not neat, and some fields are more seriously damaged. In The three cities and 5 counties (districts) of Hechi, Baise and Qinzhou in Guangxi Zhuang Autonomous Region, adult grassland moths were found to have moved in, and on April 3, larvae were found in Fusui County of Chongzuo City and Youjiang District of Baise City.
Nanning Plant Protection Station organized and held the "Nanning Corn Grassland NightCrawler Emergency Prevention and Control Site Meeting" in Anshan Village, Guzhi Town, Mashan County
"The grassland night moth has been found in all counties and districts of Nanning, and the current degree of occurrence is not too serious, the rate of insect plants is below 8%, and the number of 100 insects is less than 10." At present, the resistance of the grassland moth is low, and a variety of insecticides can play a good control effect on it, and can be effectively controlled by early detection and early control. Huang Shusheng said that the grassland night moth is a new invasive species, which is not yet the legal quarantine object of China. Through field investigation, the Nanning Plant Protection and Plant Inspection Station found that in Nanning, the grass moth plants that appeared in the same land were relatively concentrated, and the same land was relatively scattered, and the adjacent plots of the grassland moth-infested plots were found to have no harmful symptoms.
Guangdong has not yet happened
The reporter learned from the Agricultural Pest Early Warning and Prevention Center of the Department of Agriculture and Rural Affairs of Guangdong Province that at present, Guangdong has not found the harm of the grassland night moth. "Since the spring festival in Yunnan, Guangdong Province has issued relevant plans and set up dozens of monitoring stations in the main corn planting areas in the province to focus on monitoring the grassland moth, but at present, it has not been found that the grassland moth has occurred in Guangdong." A person in charge of the center told reporters, "Now the Ministry of Agriculture and Rural Affairs has also issued relevant notices and prevention plans, and Guangdong Province is also closely monitoring the occurrence of grassland night moths to achieve early detection and early prevention." ”
Expert analysis predicts that with the rise of temperature, the adult grassland moth may migrate and invade most of the southwest, south China and jiangnan, and invade the middle and lower reaches of the Yangtze River, Huanghuai, East China and northeast China, and the risk of harm in the main corn planting areas in China is high. If it is relocated to China's corn planting areas, it is bound to pose a serious threat to various crops such as corn.
More harmful than ordinary armyworms
Adult long-range migration, larval outbreak feeding, and migratory diffusion are similar to the common diseases of corn, but are more harmful than armyworms and have different symptoms. Corn leaves infested with grass moths have translucent membrane "window holes" and irregular elongated holes, while the leaves of common armyworm infested leaves are absent-carved.
The grass moth uses larvae to bite plant leaves, rhizomes, growth points, fruits and other plant tissues with chewing mouthparts. On corn, 1 to 3 instar larvae usually come out at night to be pest, mostly hidden in the back of the leaf to feed, after feeding the remaining leaf epidermis, forming a translucent film-like "window hole"; young larvae will also spit silk, with the help of wind diffusion to the surrounding plants to continue to harm. 4-6 instar larvae are more seriously harmful to corn, forming irregular long holes after eating leaves, and can also eat the leaves of the whole corn, which can cause the death of corn growth points in severe cases. In addition, the older larvae feed on the male and female ears of corn. Due to the large amount of food, especially in the advanced age, it is explosive, and a plot of land can be moved in groups to continue the harm, which shows the seriousness of its harm.
External symptoms
There is no registered drug, and it is used for the prevention and control of nocturnal moths
The National Agricultural Technology Extension Service Center recently organized experts to formulate the "2019 Grassland NightcrawlEr Prevention and Control Technology Plan (Trial)", which requires strengthening monitoring and early warning, focusing on prevention and control in sub-districts, making emergency prevention and control preparations, and ensuring early detection and early control. The "Plan" proposes that three prevention and control methods can be used:
1. Ecological regulation and protection and utilization of natural enemies: Areas with conditions can be intercropped with non-grass crops, protect parasitic and predatory natural enemies in the natural environment of farmland, give play to the natural control advantages of biodiversity, and form ecological interception zones.
2. Adult booby-trapping technology: during the occurrence of adult insects, concentrated continuous tablets are trapped by insecticidal lamps, which can be combined with sexual attractants and food attractants to improve the prevention and control effect.
3, larval control technology: seize the best time for the prevention and control of young larvae, the best time to choose the application time is in the early morning or evening, pay attention to spraying on the corn heart leaf, male ear and female ear and other parts. (1) Biological control: In the early stage of egg hatching, spray white zombie, green zombie, thuringiensis preparations and polybactericides, matrine, neem and other biological pesticides. (2) Emergency control: When the density of insect population in corn field reaches 10 heads/100 plants (refer to the insect population density index of the second generation of armyworm prevention and control in corn field), an efficient and low-toxic insecticide spray spray control for the prevention and control of pests of the nocturnal family can be selected. Insecticides such as polymycin, cypermethrin, cis cypermethrin, filamentium diamide, chlorantraniliprost benzamide, and cyanoanthramide bromide have a good control effect on the grassland night moth.
The reporter learned in the interview that although domestic enterprises have begun to pay attention to the prevention and control of the pest, they have also done relevant research. However, due to the little knowledge of the occurrence law, breeding situation and harm scope of the pest in China, I dare not blindly recommend drug prevention and control. "At present, a lot of the information in hand is foreign, and the occurrence of the grassland night moth in China needs to be further studied." The person in charge of a domestic pesticide enterprise told reporters that whether the foreign prevention and control experience is applicable to the country also needs to be examined.
It is understood that after the invasion of the grassland moth in China, there is no registered pesticide available, at present, some enterprises and regions are used as nocturnal moths for prevention and control, and the prevention and control measures promoted are also common domestic nocturnal moth prevention and control methods, and whether the method can effectively control the grassland moth still needs time to test.
Author 丨 Zhao Piaopiao Ren Yahang Zhang Yudan
Editor 丨Nong Caijun
Report 丨020-83003400
Southern Rural Daily 丨Nong Finance Network Agrochemical Treasure Book
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