Can rice armyworms eat how long is the growth period 20

Armyworms are typical migratory pests, migrating from south to north along the airflow from March to mid-August every year, and then southward with the northerly airflow from late August to September. In China, 8-2 generations occur in sequence from south to north every year. In the eastern half of China, 6-8 generations occur a year south of 27°N, and the late rice generation in autumn and wheat generation in winter are more likely to occur. In the area of 27°-33°N, 5-6 generations occur in a year, and the late rice generation is more harmful in autumn. In the area of 33°-36°N, 4-5 generations occur in a year, and the generation of wheat damage occurs more in spring. 3-4 generations occur in the area of 36°-39°N latitude a year, and more in autumn, harming wheat, corn, millet, rice, etc.; North latitude 39°N, 2-3 generations occur in a year, and more in summer, harming wheat, millet, corn, sorghum and pasture.

In January, the area north of isotherm 0 (33°N) cannot overwinter and moves in from the south every year; In the northern half of the isotherm O -8 (33°-27°N), larvae or pupae overwintered in rice stubble, paddy ridges, straw piles, mushroom bushes, lotus terraces, weeds, etc., while larvae mostly overwintered in wheat weeds in the southern half, but the number was small. In January, south of isotherm 8 (about 27°N), it can reproduce all year round, mainly overwintering in wheat fields.

Adults migrate with the wind, have strong flying power, have the habit of lying diurnal and nocturnal, and like to eat nectar. The eggs are mostly laid at the tip of the yellow leaves of the rice plant or the inside of the leaf sheath, and dozens to one or two hundred grains form an egg mass. Under suitable conditions, each female can lay 1,000 eggs in her lifetime, up to a maximum of 3,000 eggs.

After hatching, the larvae first eat the egg shell, and then crawl to the leaf surface to disperse and cause damage, and have the habit of feigning death after 3 instars. After the larvae are mature, they burrow into the topsoil near the rice plant to build a soil chamber to pupate, and when there is water in the field, they can also pupate at the base of the rice bush.

The number of occurrences depends on climatic conditions. The suitable temperature for adult eggs is 15 -30, and the optimal temperature is 19 -21. When the relative humidity is lower than 50%, the number of eggs laid and the mating rate decreases, and when the relative humidity is lower than 40%, all the first-instar larvae die. During the oviposition period of adults and the young larvae, the rain is coordinated, the climate is humid, the armyworm is heavy, and the dry climate is light, especially the high temperature and drought are not conducive to its occurrence.

However, excessive precipitation, especially heavy rains or storms, can significantly reduce populations.

Prevention and control methods. 1) When there are 15 insects per m2 in the paddy field, spray 90% crystal trichlorfon or 50% pine borer EC or 50% phoxanthion EC 1000 times, 25% insecticide or 25% insecticidal double 500 times liquid, 20% pyrethrin or 4000-5000 times of dipyrethroid concentrate before the 3rd instar of the larvae.

2) It can also be sprayed with trichlorfon powder or 5% marathon powder or phoxanthion or insecticide powder or fenvalerate powder, spraying 2kg per 667.

3) Trichlorfon powder or phosphine powder or methyl dichlorfon powder can also be used. 2kg of medicine per 667, mixed with 15-20kg of fine sand or fine soil, made into granules and sprinkled, the effect is also very good.

In the case of an outbreak of rice armyworm, it can cause a partial failure of the harvest.

The life cycle of pests is not certain, and varies with the temperature, generally the high temperature cycle is short, and the low temperature cycle is long. To put it simply, as long as the conditions allow one generation to produce two generations, and two generations to produce three generations... However, the amount of pest occurrence in each generation is affected by many factors.

Once the climatic conditions are not suitable for their survival, the adults migrate out of the area.

There are many pesticides to control, and it is necessary to prevent and control them as soon as possible, and young larvae are the critical period for prevention and control!

You can choose: 1. Emamectin benzoate + cyfluthrin.

2. Chlorpyrifos + cyfluthrin.

Choose any formula to effectively control the insect infestation.

Rice armyworm can lead to reduced rice yields or even no harvest. The growth period varies according to the environment.

Rice armyworm is a multi-type pest, armyworm larvae lurk in the base of the rice bush or in the soil cracks of the rice field during the day, and come out at night or on cloudy days as a pest, mainly to the larvae bite the rice leaves, the 1 2 instar larvae only eat the mesophyll to form small holes, the 3 instar only forms a gap, the 5 6 instar reaches the gluttony period, when the leaves are eaten into stalks, the milk maturity stage, the yellow maturity period bites off the small branch stem, often 1 2 days and nights within the grain full of the field, resulting in serious yield reduction, and even no harvest.

Rice armyworm control measures:

1. Booby trap adult insects.

Adults are very taxistic to sugar, vinegar and fermented syrup, nocturnal, and phototaxis. It can be booby-trapped with black light and syrup. Black light insect trap can be in the adult occurrence period, every 45 75 acres of land set up a 40 watt black light lamp, 30 cm higher than the seedlings, put a basin under the lamp, and then add kerosene to float on the water surface, turn on the light at night to trap the collection, early in the morning to fish out the dead insects and pounce on the live insects in the water; Sweet and sour liquid traps adult insects, and wine, water, sugar, and vinegar in the trap are pressed by 1:

In the ratio of 2:3:4, add a small amount of trichlorfon, put the trap solution into the pot, place it at the distance between the fields and the ground l meter every evening, and take the trap pot back in the morning and cover it to prevent the trap from evaporating.

2 Add a trap once every 3 days, and change the trap once every 5 days.

2. Grass to lure eggs.

Loosely bundle the straw into small handfuls 2 feet long and 3 inches in diameter, and insert them in the corn or rice field, higher than the plant. 5 Change it once every 7 days, and burn the replaced grass handles, and spray sweet and sour liquid on the grass handles for better results.

All sweet and sour pots and grass that attract moths and eggs are sprayed every 7 days to kill the larvae hatched from the eggs produced.

3. Pharmaceutical prevention and control.

In the event of a large occurrence, it can be sprinkled with trichlorfon mixed with fine soil or plant ash in the evening; In the year of general occurrence, at the peak of the third instar larvae, 25 50 grams of 90% trichlorfon per mu are used, and 50 kg of water is added. Or spray 50% phosphine EC 1000-1500 times 50 kg per mu, or 20% pyrethrin EC 2000 times 50 75 kg. or 50% dichlorvos emulsifiable concentrate 800 1000 times liquid 50 kg.

In addition, you can also use 30 40 grams of 25% chlorpyramide suspension, add 50 kg of water to spray.

Agriculture and cropping are fundamentally different, but they are essentially related.

1. Agriculture in a broad sense includes planting.

There are five forms of industry: forestry, animal husbandry, fishery and sideline industry. Agriculture in the narrow sense refers to cropping.

2. The objects of agricultural labor are living animals and plants, and the products obtained are the animals and plants themselves; Cropping uses the living functions of plants to obtain grain, non-staple food, feed and industrial raw materials through artificial cultivation.

3. Agriculture is a production sector in which people use the living functions of animals and plants to transform the materials and energy of nature into products needed by human beings. Land is irreplaceable in agriculture as the basic means of production, and the objects of labor are mainly living animals and plants, and the production time is inconsistent with the labor time, which is greatly affected by natural conditions, and has obvious regional and seasonal characteristics. Agriculture is the source of food and clothing for human beings, the foundation of survival, and the primary condition for all production.

It provides grain, non-staple foodstuffs, industrial raw materials, capital and export materials to other sectors of the national economy. Rural areas are also the largest market for industrial products and the largest labor force.

4. Planting is the main component of agriculture, which is characterized by using land as the basic means of production and using the biological functions of crops to convert solar energy into chemical potential and agricultural products. In essence, planting is based on land as an important means of production, using green plants, through photosynthesis to synthesize carbon dioxide, water and minerals in nature into organic matter, and at the same time, converting solar energy into chemical energy and storing it in organic matter. It is the substance of all plant products as food, and it is also the material basis of human life activities.

Planting is an important foundation of large-scale agriculture, which is not only the main food and means of subsistence that human beings rely on, but also provides raw materials for the textile industry and food industry, and provides feed for animal husbandry and fishery. At the same time, the distribution and development of the planting industry has a direct impact on all sectors of the national economy.

5. Planting occupies a special and important position in the whole agriculture and is the foundation of the whole agriculture. After human society transitioned from a gathering and hunting economy to agriculture, these nutrients, whether from plant food or animal food, were originally planted. Plantation has always been the foundation for the existence and development of human society.

6. All activities of agricultural production are related to the seasons and must be arranged in the order of the seasons, and the seasonality and periodicity are obvious. It has obvious regional characteristics, and the objects of agricultural production are animals and plants, which require natural conditions such as heat, light, water, topography, and soil. Different organisms require different natural conditions for growth and development.

Natural, economic and technical conditions and national policies vary greatly from place to place.

1.Agriculture can be varied, both by definition and in form. As a science it contains agricultural engineering, horticulture, agricultural management, agricultural entomology, etc.

Crop farming refers to the extensive cultivation of cash crops in a large area for raw materials and economic effects. For example, cocoa bean cultivation in Ivory Coast, rubber and palm oil in Southeast Asia, and so on. Cropping is more like a specified form of commercial farming in agriculture, which is the extensive and large-scale cultivation of cash crops.

From the perspective of products, agriculture can be in the form of self-sufficiency, such as early rice cultivation in some areas of China, or scientific and technological research, such as experimental fields and so on to develop new seeds. And the products of the planting industry are for international or domestic export and so on. Modern agriculture is gradually developing towards intensive science and technology, such as soilless cultivation, genetically modified technology and so on.

Modern agriculture is also increasingly moving towards commercial farming-style crops, which produce cash crops in large quantities.

2.Agriculture is an industry that produces food and industrial raw materials through the cultivation of plants and animals. Agriculture belongs to the primary industry, and the science that studies agriculture is agronomy.

The objects of labor in agriculture are living animals and plants, and the products obtained are the animals and plants themselves. We refer to the various departments that use the laws of growth and development of animals, plants and other organisms to obtain products through artificial cultivation as agriculture. Plant cultivation.

Crop farming is one of the main components of agriculture in the agricultural production sector that cultivates various crops and obtains plant-based products. A social production sector that uses the living functions of plants to obtain food, non-staple foods, feed and industrial raw materials through artificial cultivation. It includes the cultivation of various crops, forest trees, fruit trees, medicinal and ornamental plants.

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Living in Jintianjiayuan, what are the procedures for going to the fourth middle school.

You can't do it alone, you have to mobilize your friends who support you to go to the village branch to respond, and then respond to the top, asking for funds to support those of you who have ideas. The most important thing is that you first let the local farmers believe in you and support you!

- Make it look like you may only have one choice.

You might break out of the world, if you think so yourself, do it!

You'll have to find another way to solve the problem. ideas, there will always be gaps.

Agriculture includes planting--- planting includes horticultural planting--- horticultural planting includes flower planting. Therefore, growing flowers belongs to agriculture.