Which of the following is an appropriate time to apply an insecticide?

Applying an insecticide at dusk or dawn when insects are most active is the most effective choice because it maximizes the potential for the pesticide to come in contact with the target pests. Many insects, including pests that affect ornamental and turf plants, tend to be more active during these times, increasing the likelihood of successful pest control. This timing helps ensure that the insecticide has a better chance of being effective by targeting pests when they are foraging or engaged in activities that increase their exposure to the treatment.

Utilizing this strategic timing also minimizes potential environmental and non-target impacts, helping to prevent pesticide drift and reduce exposure to beneficial insects that may be active at other times of the day. Overall, applying insecticides when insect activity is highest optimizes their effectiveness while considering safety and environmental health.