What is the term for the point at which control measures should begin due to pest damage?

The correct term for the point at which control measures should begin due to pest damage is called the Action Level. This is the level of pest infestation where intervention is necessary to prevent further damage and economic losses. Option B, Economic Threshold, refers to the point at which action should be taken if the cost of pest damage outweighs the cost of control measures. Option C, Injury Threshold, refers to the amount of damage a pest causes before economic losses occur. Option D, Pest Tolerance Level, refers to the maximum acceptable level of pest infestation that can be tolerated without causing significant damage or economic losses. Therefore, while all the options relate to pest damage, only option A specifically refers to the point at which control measures should begin.