(I) This is so because pests have a natural ability to evolve and adapt to their environment, including the pesticides used to control them. Over time, pests can develop resistance to these chemicals, making them less effective. This rapid evolution of pests can outpace the development of new pesticides, leading to a situation where current pesticides remain effective only for a short time.
(ii) Man has used his knowledge of natural selection to deal with this problem by developing integrated pest management (IPM) strategies. IPM is a multi-faceted approach that combines a variety of pest control methods to reduce pest populations and minimize the use of pesticides. This approach includes cultural, biological, and chemical control methods, such as crop rotation, biological control agents, and low-risk pesticides. The use of multiple methods helps to reduce the pressure on pests to evolve and adapt, slowing the development of resistance to pesticides. Additionally, IPM strategies help to promote a more sustainable and environmentally-friendly approach to pest control, reducing the impact of pesticides on the environment and human health.
In conclusion, man is facing a growing challenge in controlling pests due to the rapid evolution of pests and their ability to develop resistance to pesticides. By using his knowledge of natural selection and applying integrated pest management strategies, man can slow the evolution of pests, reducing the pressure on pesticides and promoting a more sustainable and environmentally-friendly approach to pest control.