Aphids are a common pest in crop production, how to control them?

It is best to spray insecticides, pay attention to the time and location of spraying, but also pay attention to the external environment, and do not mix before rain.

It is necessary to pay attention to watering, fertilization, and the use of pesticides, so that we can grow better, and we must pay attention to the selection of varieties of planted plants.

Integrated Pest Management (IPM). For example, the characteristics of egg concentration are used to manually remove; Characteristics of larval colonies, chemical spraying; Adult tropism, tropism, trapping, etc.

Aphids are the most common pests in our agricultural production, and they are also the most destructive pests. This phenomenon is becoming more and more common in rural areas, which not only wastes money on medicine for farmers with low education level, but more importantly, wastes the best opportunity to spray and kill insects. It is recommended that when controlling aphids, it can be controlled in the form of compounding, and at present, cyhalothrin and chlorpyrifos are widely used, and the compound agents include:

Imidacloprid, thiamethoxam, dinotefuran, spiromethane, sulfoxapyr, etc.

Aphids not only suck the juice of crops, affect growth, flowering and fruiting, etc., but also spread viral diseases in the field, causing deformity and yellowing of flower and leaf buds or fruits, which seriously affects yield and quality. In addition, aphids multiply relatively quickly when the temperature and humidity are suitable, and in some areas, nearly 30 generations can occur in a year, and the temperature is about 39 The fastest reproduction, and 10 30 generations can reproduce a year, and the overlapping phenomenon of generations is prominent. Female aphids are born to give birth.

And aphids do not need males to conceive (i.e., parthenogenesis).

You can also choose natural enemies to control in the planting process, ladybugs, spiders, aphid cocoon wasps, etc., can eliminate aphids. It can be combined with wheat fields, and the seven-star ladybugs in wheat fields can destroy aphids. Field management is also crucial for the growth of aphids, and proper management can effectively prevent the formation of aphids.

There is a saying that "natural selection, survival of the fittest", and there is a saying "existence is truth". Probably that means, providence! Nature, environment, climate, temperature, etc., under certain conditions, it is generated.

Aphids are this evil thing, easy to destroy, and pesticides will die as soon as they are hit.

Aphids, in many places are also called greasy insects, because aphids reproduce very fast, and soon breed a bunch of aphids gathered together, and aphids will also secrete some honeydew, slimy, so called greasy insects, aphids are actually very simple to kill, but simple to kill does not mean that aphids are less harmful. The seedling stage begins to harm, so that the cotton seedlings can not grow normally, in this period to use imidacloprid, kill aphid, seven days to prevent and control once, 2 to 3 times in a row, can be prevented, to the day called the aphid, most of the gathering behind the old leaves harm, can be used dichlorvos mixed wheat straw scattered in the field, with the method of fumigation to kill.

1. Eradicate the overwintering host, eliminate the aphid eggs, and eradicate all the grasses in the field after the end of September to the hatching of the overwintering eggs in the next spring, and burn or manure them on the spot; 2. Completely eliminate the aphid nest in the low leaf stage to prevent the spread of the aphid, in early July, timely hit the lower part of the aphid 3 4 leaves, and touch the leaf sheath with your hand to kill the aphids in the sheath; 3. Use a small broom to sweep away the aphids on the sorghum leaves, and kill them intensively, generally 3 or 4 times in a row. 4. Sowing seeds in a timely manner to protect natural enemies can also reduce diseases; 5. Pesticide control, eliminate before heading, not up to the heart leaf and flag leaf is appropriate, spray 5 kg of Xerum fruit powder per mu, or 2000 times of 40% dimethoate, sorghum later, after the plant aging, the absorption of the liquid medicine is poor, and the effect is not good.

Eradicate the overwintering host, eliminate the aphid eggs, in early July, timely remove the 3 4 leaves with aphids in the lower part, kill the intrathecal aphids, sweep the aphids on the sorghum leaves with a small broom, and kill them intensively, generally 3 or 4 times in a row.

In the early stage of the emergence of sorghum aphids every year, sorghum can be sprayed with pesticides to control aphids, so as to effectively avoid the occurrence of aphids harming sorghum.

Aphids suddenly appear on plants that are not originally free of aphids, and they can breed in two ways. One is hatched from eggs produced by the mating of male and female aphids in the previous year, and the other is an aphid produced by winged aphids that land on plants. Aphids usually produce offspring in parthenogenesis, and the vast majority of wingless aphids we see on plants are female aphids.

The propagation speed is very fast, the range is very fast, and the lethality is very large, which will make the leaves of Zanthoxylum pepper turn yellow, will make the growth rate of Zanthoxylum pepper become very slow, and will also make the leaves droop and reduce the yield; Apply more fertilizer, but also sprinkle nutrient solution, poison agent, temperature should be suitable, and there must be a certain amount of sunshine, so as to prevent these pests.

First of all, it is necessary to disinfect the soil when planting, pay attention to regular pest prevention, and also pay attention to regular deworming. Moreover, the seeds should be treated and disinfected, so as to prevent the occurrence of some diseases.

Most of the dry conditions will occur, seriously affect the growth of plants, be sure to pay attention to watering, pay attention to the local climate, and use pesticides on time.

Aphids. It is true that larvae and adults feed differently than they do for survival.

1.In spring and summer, most or all of the aphid colonies are female, because the eggs hatched after the winter are mostly female. At this time, the female mother directly produces larvae, and the eggs develop directly in the mother's body, so it is ovoviviparous.

This reproductive cycle continues until the end of the summer. Thus, a single female can produce hundreds of millions of aphids after hatching in the spring. In autumn, the light cycle and temperature changes and the amount of food decreases, causing female aphids to start producing male larvae.

Male aphids are genetically identical to their mothers, except that one sex chromosome is missing. Male and female aphids begin to mate, and females lay eggs. These eggs, after spending the winter, hatch into female aphids with or without wings.

2.Places with a lot of aphids often have ants. Aphids take the phloem of plants.

The sap in the sieve tube is fed, and the plant contains a low concentration of nitrogenous substances that are used to make proteins. As a result, the aphids have to consume a large amount of sap that exceeds their own volume to meet their nutritional needs, and the excess fluid is excreted through the rectum with honeydew. Honeydew from aphids is rich in sugars.

Ants are very fond of honeydew and shuttle among aphids, often patting their backs with their antennae to encourage them to secrete honeydew. Ants are the "herdsmen" of aphids, and they will carefully guard there to protect aphids from ladybugs, ticks.

Wait for the invasion of natural enemies, beware of other ants snatching away aphids. In this way, a symbiotic relationship between ants and aphids is formed.

Aphids provide food for ants, and ants protect aphids and create a good feeding environment for aphids.

I think because they are mutually reinforcing, it is most afraid of pesticides, because pesticides can kill them, so it makes sense that it is afraid.

1. Fear of predatory predators.

Pests that can prey on aphids include seven-star ladybugs, lacewings, aphid-eating flies, aphid cocoon wasps, etc., all of which prey on aphids.

2. Fear of low temperatures.

Aphids will overwinter on plants in winter, and if the temperature is too low, the aphids will freeze to death.

Summary. The introduction of ladybugs to control aphids is a very effective method of natural enemy control, but there may be some factors that affect the effectiveness:1

Too few ladybugs introduced: If too few ladybugs are introduced, they are not enough to control the aphid population, resulting in poor results. 2.

Insufficient adaptability of exotic ladybugs: the introduced ladybugs may not be able to adapt to the local environmental conditions and the survival and reproduction conditions of local aphids, resulting in a slower reproduction rate and thus unable to control the number of aphids. 3.

Environmental pollution: Strong pesticides and chemicals can have a negative impact on natural enemy crops, causing ladybugs to lose their ability to control aphids. 4.

Weather conditions: Changes in weather may also affect the population and reproduction of natural predators, such as drought, high temperatures, and other extreme weather may lead to a decrease in ladybug populations.

What is the reason for introducing ladybugs to your own vegetable garden to control aphids, but the results are poor? May affect the introduction of natural enemy control+

The introduction of ladybugs to control aphids is a very effective method of natural enemy control, but there may be some factors that affect the effectiveness:1The number of hood-leaking ladybugs introduced is too small:

If the number of ladybugs introduced is too small, they are not enough to control the aphid population, resulting in a poor effect. 2.Insufficient adaptability of exotic ladybugs:

The introduced ladybugs may not be able to adapt to the local environmental conditions and the survival and reproduction conditions of the local aphids, resulting in a slower reproduction rate and thus the number of aphids cannot be controlled. 3.Environmental pollution:

Strong pesticides and chemicals can have a negative impact on natural enemy crops, causing ladybugs to lose their ability to control aphids. 4.Weather conditions affect:

Changes in weather may also affect the population and reproduction of natural predators, such as drought, high temperatures, and other extreme weather may lead to a decrease in ladybug populations.

What are the possible reasons that affect the sustainability of the introduction of natural enemy control?

The sustainability of the introduction of natural enemy control may be affected by the following factors:1Environmental Changes:

Environmental changes may affect the number and distribution of natural enemies, thus affecting their control of pests. For example, factors such as climate change and land use change may affect the ecological environment of natural enemies, affecting their survival and reproduction. 2.

Pest resistance: Pests may become resistant to certain pesticides or natural enemies, making them less effective against these pests. 3.

Effects of natural enemies on other organisms: The introduction of natural enemies may have an impact on other organisms in the area, such as insects, plants, and microorganisms in the air, which are not pests. 4.

Invasive species: Introduced natural enemies may become new species in the area, causing imbalances in existing ecosystems and causing new environmental problems.