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Biological pest control is better than chemical control.

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Introduction

Biological Pest Control is Better than Chemical Control. A pesticide is any agent used to kill pests or control the incidence of insect pests, plant pathogens and weed populations. Biological control is the control of pest and weeds using specially chosen living organisms or biological products, whereas chemical control is the use of pesticides or chemicals to kill or control pests. Predators or parasites are used to keep the pest population low. Insects move, leaving their enemies behind, so by introducing their natural enemies to the environment the number of pests and their effect on the surroundings decreases. The population of the enemy can be increased by mass production in a lab. Releasing it when the pest is most susceptible makes it more likely this method will be effective. Selective breeding could also be used to breed a more effective insect to kill the pest. ...read more.

Middle

Fungi pathogens are controlled by the use of specific chemical fungicides, for instance, the rice blast and rice blight were both stopped by the use of a specific chemical. New compounds are being developed to stop fungi pathogens from adapting. Strobilurins are also being developed. These are based on naturally occurring fungi, and are toxic to other fungi pathogens. Old weed killers (such as 2,4D) are still in use because they are much cheaper than newer herbicides. However, a lot more is required to be effective in the killing of plants. Old weed killers are very good at killing a wide range of different weeds. However, many wanted plants may also be killed in the process. If it is washed into rivers or lakes, pondweed and other underwater plants will be killed, removing the source of food for many fish and insects. ...read more.

Conclusion

To develop alternative pesticides is expensive and the same thing could easily happen again. Biological pest control is generally cheaper and "some biological control measures can actually prevent economic damage to agricultural crops"(www.ncsu.edu/bio). They are usually specific and do not affect other insects or animals. There is less danger of impact on the surroundings. However, Biological control can take, months rather than weeks to become effective. The results are not as dramatic or quick as the results of chemical pesticide use. On building sites, rail tracks and motorways you may want all plant life to be killed. In these circumstance it would be better to use a chemical that will not break down or only kill certain pests. Generally, biological pest control is better than chemical control as it doesn't pollute the environment or affect other plants or animals. However, there are some circumstances when it would be more sensible to use a chemical. ...read more.

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