Which factor directly affects pest resistance in plants?

The factor that has a direct impact on pest resistance in plants is climate changes. Changes in climate can influence the development and life cycles of pests, potentially leading to increased pest pressures. For instance, warmer temperatures can accelerate pest reproduction, and altered rainfall patterns can affect plant health and stress, making them more susceptible to insect invasions. Additionally, climate change can shift the distribution of both pests and their natural enemies, affecting the dynamics of pest populations in various regions.

When plants are exposed to new climate conditions, such as drought or increased humidity, their ability to defend against pests can be compromised, making the plants more vulnerable. Furthermore, climate conditions can influence the production of secondary metabolites in plants, which are crucial for their pest-resistance traits. Hence, understanding climate changes is essential for managing pest resistance effectively.