What is the term for pests that become problematic when key pests are controlled?

The correct term for pests that become problematic when key pests are controlled is "secondary pests." This concept refers to species that typically do not pose significant issues in the absence of certain primary pests. However, when the primary pests are reduced or eliminated, the environmental balance can shift, allowing these secondary pests to thrive and potentially cause damage.

This phenomenon often occurs in integrated pest management (IPM) systems where the control measures may inadvertently allow for the resurgence of these less dominant pests. Understanding this dynamic is crucial for pest management strategies, as it highlights the importance of monitoring for changes in pest populations and ensuring that control measures do not inadvertently create new pest challenges.

In contrast, key pests are those identified as the main targets for control due to their significant impact on crops or environments. Causal pests are not a standard classification in pest management terminology, and occasional pests typically refer to species that may only cause issues under specific conditions, rather than as a result of controlling other pests.