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It is now the spring of the recovery of all things, and it is a good time for spring ploughing, however, the Chinese Academy of Agricultural Sciences has issued 3 spring ploughing warnings! The first point is the early warning of the grassland night moth infestation. The grassland night moth, by June, is likely to invade the northeast and Inner Mongolia region! Now, teacher Zhi Nongwei will analyze the transmission path and control method of the grassland night moth!
<h1 class= "pgc-h-arrow-right" > First of all, let me tell you about the major insect pests that have occurred in history. </h1>
1. Locusts.
Locusts have been seriously harmful in the history of our country, and in the past we can often see reports of locust plagues. Once a locust plague occurs, there will even be "cannibalism" - that is, the phenomenon of human cannibalism. In recent years, there has been no locust plague for a long time, the most recent of which is the desert locust. The desert locusts that cover the sky and the sun, after crossing many countries, follow the wind to invade our neighbors , India and Pakistan.
When everyone was worried about whether the locusts would come to China to "visit", the expert group came out to respond: the possibility of flying to China is very small, and there is no record of desert locust infestation in China. More than that, we should be more worried about the grassland moth that has colonized our country. Later, I will tell you about the grassland night moth, and now we will look at the next famous pest, the cotton bollworm.
2. Cotton bollworm.
This lepidoptera nocturnidae insect was the number one pest of the nineties! It is omnivorous and can feed on wheat, cotton, corn, peanuts and other crops, until after 2000, the harm was reduced. The meadow moth, a close relative of the cotton bollworm, also became the number one pest last year.
3. Grassland nocturnal moth.
This close relative of the cotton bollworm, from South America, has five strong skills: (1) strong reproductive ability, which can lay 100-200 eggs at a time; (2) strong adaptability; (3) strong destructiveness; (4) strong flight ability; (5) eating a lot of things, that is, omnivorous and gluttony.
The harm of the grassland moth is mainly larval harm, and the larvae eat a lot and mixed, and the adults will continue to migrate. From the following figure, we can see the migration trajectory of the grassland night moth:
It took off from South America and came to Nigeria in 2016. Even when it came to the hot African continent, the grassland moth quickly adapted to the environment of the African continent because of its adaptability. Following the monsoon, the grassland moth continued to migrate until December 2018, when it began to be found in China. Then I went to Korea and Japan.
Grassland nocturnal moth migration trajectory
Bugs are most rampant during this period of stinging. Until summer, there will be a period of dormancy called summer dormancy. After an outbreak period in autumn, winter begins to hibernate, so the most critical control period is spring and autumn, but the grassland night moth still does not stop in the summer and still spreads northward.
Environments below 10 degrees are not suitable for the survival of the grassland moth, so there will be a phenomenon of relocation. Southern Yunnan, Hainan, Guangxi, Guangdong, and some areas in Fujian have left behind meadow moths that have passed the winter. Staying means that it has colonized in our country, relied on it and completed an invasion process. Therefore, this year, plant protection stations around the country have successively reported the traces of the grassland night moth. Since we cannot drive away, we can only strengthen prevention and control.
<h1 class = "pgc-h-arrow-right" > how will this year's grassland moth spread, and which areas will it mainly harm?</h1>
It is not possible to continue deep into the hinterland now, but in April, the warm and humid air currents are blowing, which is conducive to the spread of the grassland night moth. If it flies for three consecutive nights, the first night, it will come to Sichuan; on the second night, it can enter the southern part of Hunan, Jiangsu, and Shandong; on the third night, it will reach Shandong, Hebei, and even enter Liaoning. The strong ability of the grassland moth to migrate is reflected in this, and it can come from the south to the north in three nights.
<h1 class="pgc-h-arrow-right" why do > countries attach so much importance to this pest? </h1>
Mainly because the grassland moth can eat, including corn, sorghum, sugarcane, wheat, barley, soybeans, peanuts, rapeseed, sunflowers, bananas, vegetables and so on.
The grassland moth is mainly divided into corn type and rice type. Corn-type rice can not complete the life history, what does it mean, that is, eat rice, grassland moth can not absorb, malnutrition gradually dies. However, if you are hungry, you will still eat it, and if there is a large-scale outbreak, you will still eat rice clean.
<h1 class = "pgc-h-arrow-right" > control method: it can be divided into two kinds of agents, biotype pesticides and traditional chemical pesticides. </h1>
1. Bio-type pesticides, the effect is not optimistic.
The mainstream biopesticides on the market are polymycin, coccidioides, thuringiensis, avermectin, matrine, scarab green zombie, rotenone and so on. Except for polycycline, the other effects are average. Some need to be used in high temperature and high humidity environments to be effective, such as Coccidioides albicans. The principle is like a cold infection, which requires a suitable environment to spread.
Biotype pesticides
2. Traditional chemical pesticides.
Mainstream agents on the market include methylphenidate, acetaminate, cypermethrin, fipronil, chlorpyrifoscinamide, insecticidal bis, acetamidine, bifenthrin, dichlorvos, oxidium and so on. The best indoor effect is methyl vitamin salt, followed by acetamin phosphorus, polybactericide, cypermethrin, fipronitrile, chlorantraniliprobamide, etc., nicotine, permethrin, organophosphorus effect is general. Because the grassland moth in Europe and the United States has developed resistance to organophosphorus, the effect is average.
Traditional chemical pesticides
In the field, the environment changes, and the best effect is (1) ethyl polybactericide; (2) followed by methyl vinyl salt. Why is the effect of A vitamin salt different in the field: A vitamin salt will decompose when it sees the light, affecting the efficacy, so it is best to use it in the evening to avoid reducing the efficacy. (3) Chlorpyrrolebenzamide is the mainstream agent for meat worms - Lepidoptera larvae.
< h1 class= "pgc-h-arrow-right" > prevention and control timing</h1>
The best time to control it is before the three-year-old larvae, just hatched, or when they are small insects. After the insect is enlarged, the organ function is perfected, the drug resistance is enhanced, and the toxicity of the pesticide is correspondingly weakened. Just like when you were a child, you can kill pests with a bucket of water, and when you grow up, you need two or three buckets of water. And the size of the bugs is constantly increasing. At this time, nutrition is needed, that is, it is necessary to eat more, such as three to four years old, a period of rapid increase, with overeating.
Therefore, the best time for prevention and control is when it is just hatched, that is, before the third age, chemical pesticides are controlled with biological pesticides. Be sure not to see insects and fight insects, and prevent and control them in advance.
4. Twill nocturnal moth
Unlike the grassland night moth, the twill moth is highly resistant, but it uses a permethrin agent, which is unstoppable and needs to be compounded, such as indigovirus + methic salt. Therefore, these two kinds of insects should be distinguished and better controlled.
Distinction between the grassland moth and the twill moth:
The grass moth has spots on its back and two white lines in the middle that resemble dotted lines. Near the head, there are large triangular spots, and the line on the back of the grass moth is not very obvious, you can look at the following picture to distinguish.
Adults are also similar, but can be distinguished by the lines on the wings. The forewings of the twill moth are also a little white , with a figure eight on the back.
For this moth that is not willing to leave, we must pay attention to prevention, early detection, early prevention!
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