What is the biological control method?

Biological control mainly used the natural enemies of pests. These natural enemies could be easily divided into two categories: predatory and parasitic insects. For example, ladybugs, lacewings, aphid flies, mantises, and so on were predatory insects, while trichospices, parasitic flies, and Zhou's biting wasps were parasitic insects. Other than that, there were also parasitic wasps like the beautiful aphid wasps and the Guan's swollen leg wasps. In addition to natural enemies of insects, pathogenic microorganisms such as Beauveria bassiana and B. thuigiensis could also be used for biological control. Biological control could be roughly divided into three categories: using insects to control insects, using birds to control insects, and using bacteria to control insects. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Biological control can reduce the population density of harmful organisms such as weeds and pests. It uses the relationship between biological species to suppress one or another type of organism. It has little environmental pollution, can effectively protect natural enemies, play a role in continuous disaster prevention, low cost, safety to humans and animals, pests are not easy to produce drug resistance, reduce the amount of chemical pesticide, save energy and other prevention and control effects. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Biological control was the core component of green prevention and control technology for plant protection. It was a method of using certain organisms or their metabolism to control pests or reduce their damage. For example, natural enemies such as insects, carnivorous spiders, carnivorous vertebrae, pathogenic microorganisms, parasitic nematodes, and some higher plants played a great role in suppressing the occurrence of pests and adjusting the balance of natural populations. They were all organisms that could be used for biological pest control. Green prevention and control refers to the overall perspective of the farmland ecosystem, based on agricultural prevention and control, actively protecting and utilizing natural enemies, worsening the living conditions of pests, improving the ability of crops to resist pests, and rationally using chemical pesticides when necessary to minimize the damage caused by pests. Through the promotion and application of green prevention and control technologies such as ecological regulation, biological control, physical control, scientific medication, etc., it can achieve the purpose of protecting biological richness and reducing the probability of pest outbreak. At the same time, it is also an inevitable requirement to promote standardized production and improve the quality and safety level of agricultural products. It is also an effective way to reduce the risk of pesticide use and protect the ecological environment. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

In 2019, there were many kinds of vegetable pests in the protected land. The main pests that occurred all year round were whiteflies, thrips, harmful mites, aphids and other piercing-sucking pests. The generations overlapped, the number of insects was large, the resistance was high, and the harm was serious. Occasionally, there were diamondback moths, cotton bollworms, Spodoptera exigue, Prodenia litura and other Lepidoterous pests. The cultivation environment of protected land was closed, and it was difficult for chemical pesticide to degrade and cause serious pollution. Biological control technology was an effective way to replace the use of chemical pesticide, ensure the quality and safety of vegetables, and promote green plant protection. The prevention and control goal of that year was to control and dispose more than 95% of the important pests in the protected vegetables, control more than 80% of the overall pest control effect, control the damage loss rate within 10%, and reduce the use of chemical pesticide by more than 50% compared with conventional control methods to ensure the safety of vegetable production and products. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The main advantages of biological control included being friendly to the environment, not polluting the environment, and avoiding harm to humans and animals; many natural enemies of pests had long-term inhibition effects on the occurrence of some pests, which could continuously control the occurrence of pests; it was safe for humans and animals, and there was no pollution, so pests would not develop resistance; it could effectively avoid the shortcomings of chemical control and other non-biological control methods, and had a broad development prospect. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Biological control methods mainly included the following categories: 1. ** Using Natural Enemies to Control **: - ** Predatory organisms **: such as lacewings, ladybugs, walking bugs, chelae, ambluseius, spiders, frogs, toads, mosquito-eating fish, spearfish, and insect-eating birds. They control their numbers by preying on harmful organisms. - ** Parasitic Creatures **: For example, parasitic wasps, parasitic flies, etc., parasitize the body or surface of harmful organisms, affecting their survival and reproduction. 2. ** Using microorganisms to control **: - ** Fungus **: For example, Beauveria bassiana was used to control pine caterpillars. - ** bacteria **: For example, the various variants of B. thuigiensis can be used to control a variety of forest pests. - ** Virus **: The crude extract of the virus can be used to prevent and control the oriental cypress moth, pine caterpillar, paulownia big bag moth, etc. - ** Other microorganisms **: such as Actinomycetes (5406 to prevent seedling damping-off), Protozoa (Microsporidia to prevent larvae of Lymantria dispar), nematodes (Taishan No. 1 to prevent longicorn beetles), etc. 3. ** Control with plant extract **: Some plant extract has an inhibition or killing effect on harmful organisms. 4. ** Resistance-resistant crops **: Breeding resistant crop varieties to control pests and diseases. The resistance of crops to insects is expressed in tolerance, antimatter, and no preference. For example, breeding potato varieties that were resistant to potato late plague. 5. ** Farming Control **: Change the agricultural environment and reduce the occurrence of harmful organisms. 6. ** Insect control **: Collect or cultivate a large number of harmful insects, use gamma-rays or chemical sterilants to make them infertile, and then release them to mate with wild pests, causing their offspring to lose their reproductive ability. 7. ** Genetic Control **: By changing the genetic composition of harmful insects, the vitality of their offspring will be reduced, the fertility will be weakened, or there will be genetic infertility. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

As for the division of biological prevention and control areas, the current reference materials only mentioned that the garden park center of Zichuan District focused on the prevention and control of green space, parks, communities and important nodes according to the characteristics and laws of pests and diseases, and reasonably divided the prevention and control areas. Botanic Garden, Xincheng Park, Hongguang Mountain, Exhibition Green Area (surrounding forest land), Spider Mountain, Carp Mountain, Hongmiaozi Mountain, Pingding Mountain, Shuita Mountain, Hot Spring Mountain, Qingquan Mountain, Xuelian Mountain and surrounding barren mountain green areas; No. 2 Operation Area: Coking Mountain, Big Green Valley, Small Green Valley and surrounding barren mountain green areas; No. 3 Operation Area: Yamalik Mountain, Hongshan Park, People's Park, Urumchi River Beach Green Area, Hippo Spring Green Area; No. 4 Operation Area: Yan 'er's Nest Ancient Forest (including industrial therapy and dry therapy), Water Park, Tianshan Park, and Wulapo Forest. Xinglong Town of Jinxiang County divided the "large area" of forest pest control into "small grids" for prevention and control work, but did not explicitly mention whether it was specifically for biological control area division. On the whole, different regions were divided into biological control areas according to their respective control targets, geographical environment and other factors. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

**Biological Control: Its Advantages and Disadvantages** **I. Advantages** **A. Environmental Friendliness** 1. Biological control is highly beneficial for the environment. It reduces the need for chemical pesticides. For example, when using natural predators or pathogenic organisms to control pests, there is no or less chemical residue left in the soil, water, and air. This helps in maintaining the ecological balance and protecting non - target species. 2. It has a long - lasting impact on pest control. For instance, some natural enemies, like certain parasitic wasps, can continuously prey on pests over a long period. This sustainable control is better than the short - term effects of chemical pesticides which often require repeated applications. **B. Safety** 1. It is relatively safe for humans. Since it doesn't involve large - scale use of toxic chemicals, the risk of chemical exposure to farmers, consumers, and other people in the agricultural and surrounding areas is minimized. 2. In terms of food safety, it can lead to cleaner and healthier produce. Fruits and vegetables grown with biological control methods are less likely to carry harmful chemical residues, which is important for human health. **C. Economic Benefits** 1. In the long run, it can be cost - effective. Although the initial setup of a biological control program might require some investment, for example, in breeding and releasing natural enemies, over time it can reduce the need for expensive chemical pesticides. This can save money for farmers and the agricultural industry as a whole. 2. It can also help in maintaining the quality of agricultural products, which can lead to better market prices and thus more economic returns. **II. Disadvantages** **A. Uncertainty in Effectiveness** 1. The effectiveness of biological control can be unpredictable. The success of using natural enemies to control pests depends on many factors such as the climate, availability of alternative food sources for the natural enemies, and the adaptability of the pests. For example, if the climate suddenly changes and becomes unfavorable for the natural enemies, their ability to control pests may be severely affected. 2. Sometimes, the natural enemies may not be able to establish themselves well in the new environment. They might die off or not reproduce effectively, leading to a failure in pest control. **B. Slow Action** 1. Biological control is often a slow process compared to chemical pesticides. It may take a longer time for natural enemies to build up their populations and start having a significant impact on pest numbers. This can be a problem when there is an immediate need to control a pest outbreak. 2. In some cases, the slow action may result in significant damage to crops before the pest population is effectively controlled. **C. Potential for Unintended Consequences** 1. There is a risk of introducing new invasive species when using biological control. For example, if a non - native natural enemy is introduced to control a pest, it might start preying on other native species as well, which can disrupt the local ecosystem. 2. Sometimes, the balance between different organisms in the ecosystem can be accidentally tipped. If a biological control agent is too effective in controlling a particular pest, it may lead to a decline in other species that depend on that pest in some way, such as some birds that feed on the pest. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The main reasons for doing biological control were as follows: 1. The biggest advantage of biological control was that it did not pollute the environment, which was incomparable to non-biological pest control methods such as pesticides. 2. Dealing with pests: Under certain conditions, pests can cause harm to human life, production, and even survival. For example, pests and rats are a serious threat in the process of planting, breeding, processing, storage, and transportation. The impact of pests in industrial processing can cause huge economic losses. Biological control can reduce the population density of harmful organisms such as weeds and pests. 3. Use of biological relationships: Biological control uses the relationship between biological species to suppress one or another type of organism. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>