Biological control perspective

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>

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>

**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>

The following were some biological control scholars: Pu Zhelong, the founder of biological pest control in China, an academician of the Chinese Academy of Sciences, and an internationally outstanding entomologist; Zeng Sheng, also known as Zeng Shengzhi, was an agricultural entomologist, biological control scientist, and a doctor of science at the University of Leon, France. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Butterflies belonged to the general name of the superfamily Papilionae of the Lidoptera, which was divided into five families, namely the family of the Hesperidae, the family of the Papilionids, the family of the Pieris, the family of the Nymphalids, and the family of the Lycaenopterids. Judging from its shape, the butterfly's body was long and cylindrical. Its body and wing membrane were covered with scales and hair, forming various colorful spots. The eggs were in various shapes, including round, semicircle, spindle-shaped, oblate, etc. The larvae were caterpillar-shaped, and the pupas were covered pupas, which were oval, spindle-shaped, cylindrical, rhombus-shaped, etc. Judging from the development process, butterflies were completely metamorphosed insects. In their lives, they had to go through four forms: egg, larva, pupa, and adult. In terms of habits and abilities, butterflies had habits such as flocking and migrating, molting, closing wings, building nests, and territorial competition. They also had the ability to mimic, mutate, and protect themselves. It was widely distributed and was most abundant in tropical areas, especially rainforests. In terms of habitat, the larvae mostly inhabit the leaves or branches of the host plant (the larvae that feed on wooden plants mostly inhabit the back of the leaves, and a few inhabit the leaves). The adult female butterflies of most species will not leave their original habitat, but the male butterflies often leave their original habitat and come to the mountains and valleys. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The advantage of biological control was that it used the relationship between biological species to suppress harmful organisms. It was a way to reduce the population density of harmful organisms such as weeds and pests. Its biggest advantage was that it did not pollute the environment, which was incomparable to non-biological pest control methods such as pesticides. Regarding the disadvantages of biological control, the reference materials did not mention it, so it was impossible to answer accurately. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Biological control techniques mainly include the following categories: 1. ** Using Natural Enemies to Control **: - ** Predatory creatures **: such as lacewings, ladybugs, walking bugs, chelae, amblusae, spiders, frogs, toads, mosquito-eating fish, spearfish, and many insect-eating beneficial birds. - [Parasitic Creatures: Parasitic wasps, parasitic flies, etc.] - ** Pathogenic microorganisms **: For example, B. thuijngensis, Beauveria bassiana, etc. In China, the use of the red ladybug to control the orange blowing scale, the use of Beauveria bassiana to control the soybean pod borer and corn borer, the use of the golden wasp to control the overwinter pink bollworm, and the use of the red wasp to control the cane borer were all successful cases. 2. ** 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, sugar cane varieties that were resistant to mosaic disease, linen varieties that were resistant to fusaria wilt, and wheat varieties that were resistant to wheat stem flies. 3. ** Farming Control **: Changing the agricultural environment to reduce the occurrence of pests. 4. ** 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. 5. ** 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. 6. ** Use biological hormones or other metabolism products to control: Use some biological hormones or other metabolism products to make certain harmful insects lose their reproductive ability. For example, using pheromones to confuse insects so that they could not find a mate and could not reproduce smoothly; using the preparation of the wood mold to control plant damping-off, root rot, and root southern silk disease; using the radioactive soil bacteria K84 to control plant root cancer, etc. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>