This "moth" is particularly capable of flying, adult moths can fly 100 kilometers per night, it is a major agricultural pest of the Global Warning of the Food and Agriculture Organization of the United Nations, they are also good at group combat, and can quickly nibble a whole corn field, and after chewing, they will move in line to the next field, nicknamed "Marching Worm".
Grass nocturnal moth larvae
"Moth" is an invasive alien species, called the grassland moth, which is one of the world's top ten plant pests. In May last year, Sichuan Province first confirmed the discovery of the grassland moth in Lizhou Township, Xichang City, Liangshan Prefecture, and suffered from the corn fields in 36 local townships. This year, the "moth" has made a comeback, the moth appeared earlier, and the harm was earlier than last year. At present, Xichang has launched a prevention and control campaign to block the grassland night moth, "insects take grain from the mouth".
Trap the meadow moth
According to the Sichuan Provincial Department of Agriculture and Rural Affairs, this year's Grassland Night Moth in Sichuan Province saw insects early, expanded and spread rapidly, and is expected to occur heavily, with an area of 10 million mu. The first detection of larvae in the Panxi area on January 1 this year was four months earlier than the first sight last year.
【Insect pests】
It can fly 100 km per night
Breed fast, like corn sorghum and so on
On the morning of June 10, in the seventh group of lizhou town street village in Xichang City, several corn fields here were equipped with traps, which is one of the monitoring points of Xichang's "moths" and the first place in Sichuan Province to find the grassland night moth. The Red Star News reporter saw that some moths had been caught in the trap.
Meadow nocturnal moth
Red Star News reporters learned from the Xichang Agricultural and Rural Bureau that on May 9, 2019, after the grassland night moth was found and confirmed in Xichang City, a total of 36 townships in the city occurred, with a total of 41,901 mu. In 2020, the sown area of spring and summer corn in Xichang City is expected to be about 70,000 mu. At present, the city has set up 40 monitoring points and cooperated with high-altitude monitoring lights, and conducted continuous monitoring of insect conditions in the field from time to time.
Nie Zhen, a plant protection expert at the Plant Protection Station of Xichang Agricultural and Rural Bureau, said that the grassland moth is a particularly flying, fast-breeding pest, adult moths can fly 100 kilometers per night, this insect is a major agricultural pest warned by the Food and Agriculture Organization of the United Nations, with a wide range of suitable areas, strong migration ability, high reproduction multiples, heavy overeating hazards, and difficult prevention and control.
It is reported that the grassland night moth is one of the world's top ten plant pests, is an invasive alien species, native to the tropical and subtropical regions of the Americas omnivorous pests, is a major agricultural pest of global early warning, it has "can eat, can grow, can fly" three characteristics, like to eat corn, sorghum and other more than 80 kinds of crops, generally causing crop yield reduction of 20% to 30%, serious harvest, is a gluttonous pest.
Xichang Agricultural and Rural Bureau staff inspected the situation in the cornfield
The Red Star News reporter learned that since December 2019, the grassland night moth has colonized and been harmed in the winter corn planting areas below 1500 meters above sea level in Ningnan, Huidong, Huili, Dechang, Yanyuan and other counties in Liangshan Prefecture in the Jinsha River, Anning River and Yalong River basins.
【Prevention and Control】
We must grasp it early and grasp it small
It is mainly booby-trapped by potions and insecticidal lamps
The grassland moth colonizes in Liangshan and gradually "nativeizes". In addition, since the end of March this year, the maintenance of most of the "dry and warm" weather in Liangshan Prefecture has been more conducive to the migration of the source of the grassland moth into Xichang and the northward migration.
"This year, the grassland night moth overwinters more insects, not only from overseas, but also from neighboring provinces and many counties in Liangshan Prefecture." Nie Zhen said that last year, when the grassland night moth first invaded, it was simulated according to climatic conditions and wind conditions, predicting that it could reach Mianning County or even farther. However, according to the statistics of the actual occurrence, in 2019, the grassland night moth only spread to Xichangli Prefecture at the farthest, and due to timely prevention and control, the amount of grassland night moth was reduced, slowing down the spread rate.
Monitoring of the grassland nocturnal moth
According to reports, there are two main technical measures for the prevention and control of the grassland moth, one is to use sexual attractants or insecticidal lamps to trap adult insects; the other is pharmaceutical control, using 25 kinds of emergency control agents recommended by the Ministry of Agriculture and Rural Affairs of the State, and carry out pharmaceutical control before the third age of the larvae, and the difficulty of prevention and control will increase after four years.
Monitor maize fields
The Red Star News reporter learned that over the past few days, experts from the Xichang Municipal Bureau of Agriculture and Rural Affairs have been guiding farmers in the fields of various townships and towns to correctly use medicines and prevent and control grassland moths. This year, Xichang mainly adopts advance prevention and control, sets up monitoring points, and installs high-altitude monitoring lights to nip pests in the bud.
Insecticidal lamps
"The grassland moth must catch early and catch small, and block the grassland moth in the early and young stages; at the same time, the time of spraying pesticides must be morning or evening, because the grassland moth has the habit of lying out of the day and night, and the effect of spraying at noon is not large." Nie Zhen introduced that the larvae of the night moth are weak in resistance, and from the perspective of prevention and control, although the harm time of the grassland moth this year is advanced, it is still in the controllable stage. However, in order to protect crop safety, it is necessary to participate in the participation of the whole people and actively combat the night moth.
Chen Wei, a villager in Xingsu Village, Yulong Hui Nationality Township, Xichang, said that last year, under the guidance of the staff of the plant protection station, he knew about the harm of the grassland night moth. This year, the family's corn has just entered the "seedling stage", so I will seize the time to spray medicine and prevent it in advance. "Since the beginning of May, the medicine has been given every half a month, and the effect of prevention has been achieved, and more than 6 acres of corn in the family have not been affected."
【Analysis】
Sichuan saw the insect early this year
It was 4 months ahead of last year's first sighting
According to the Sichuan Provincial Department of Agriculture and Rural Affairs, on May 25 this year, the Department organized Sichuan Agricultural University, Sichuan Academy of Agricultural Sciences, Sichuan Agricultural Meteorological Center and relevant experts from some cities (prefectures) to conduct consultations and analysis of the main diseases and pests of crops in 2020.
According to the layout of crop varieties in the province, the current base of diseases and insects and the future climate trend, combined with the comprehensive analysis of factors such as the occurrence of diseases and insects in the past years, it is estimated that the overall incidence of crop diseases and insect pests in the province in 2020 will be more important, with an area of more than 90 million mu, of which insect pests are heavier than diseases, mainly including rice borers, rice planthoppers, grassland night moths, etc.
For the reasons for this year's heavy pests, experts explain that in addition to the low resistance level of Sichuan crop varieties, it is also related to climate. Monitoring shows that since last winter, Sichuan Province has continued to have high temperatures and little rain, and most of the diseases and insects have a low risk of wintering. According to forecasts, from June to August during the growth period of this year's spring crops, the rainfall in the main agricultural production areas of the province is more than in previous years, which is conducive to the migration and occurrence of crop diseases and insect pests.
Meadow Moth Detection Lamp
The meeting revealed that this year, the grassland moth in Sichuan Province saw insects early, the expansion and spread were faster, and it is expected to occur heavily, with an area of 10 million mu. The first detection of larvae in the Panxi area on January 1 this year was four months earlier than the first sight last year. On April 29 and April 30, Dachuan District of Dazhou City and Gulin County of Luzhou City successively found grassland moths on corn, 10 days earlier than the earliest time of insect sighting in the basin last year. At present, larvae have been found in 35 counties (cities, districts) in 9 cities (prefectures), and the cumulative area of field occurrence has increased by 91.7% over the same period last year.
According to the statistics of the National Agricultural Technology Center, as of May 28, the grassland night moth has occurred in 2.68 million mu in 720 counties in 17 provinces in China, with a total of 3.87 million mu of prevention and control. Field occurrence is still dominated by the Yangtze River Basin and its south, with Yunnan, Guangxi, Guangdong, Hainan, Guizhou, Jiangxi and other places accounting for 89.6% of the total number of counties. Since the end of May, adult insects from abroad are still moving in, and the southwest and south China of China have also entered the adult bloom period, and it is expected that the possibility of moving into the middle and lower reaches of the Yangtze River, Huanghuai and other places with the air current is expected in June.
Jiang Ying Red Star News reporter Jiang Long photo report
Edited by Zhang Li
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