At what life stage should an insecticide be directed for wood-boring insects?

At what life stage should an insecticide be directed for wood-boring insects?

• A. Eggs
• B. Newly hatched larvae
• C. Pupae
• D. Adults

Answer: (B)

The most effective time to target wood-boring insects is when they are just hatched larvae. At this early larval stage they have begun to bore into the wood and start feeding, which makes them actively exposed to any insecticide present in the wood or surrounding treatment. When larvae are feeding, they ingest or come into contact with the chemical, leading to higher kill rates and preventing further damage deeper in the wood. Eggs are not feeding and are often protected by their shell, so insecticides don’t reach them as effectively. Pupae are quiescent inside the wood, with little to no exposure to the insecticide. Adults can fly away or move, reducing contact and effectiveness. So directing the insecticide at the newly hatched larvae targets the pests when they are most vulnerable and actively causing damage.

The most effective time to target wood-boring insects is when they are just hatched larvae. At this early larval stage they have begun to bore into the wood and start feeding, which makes them actively exposed to any insecticide present in the wood or surrounding treatment. When larvae are feeding, they ingest or come into contact with the chemical, leading to higher kill rates and preventing further damage deeper in the wood.

Eggs are not feeding and are often protected by their shell, so insecticides don’t reach them as effectively. Pupae are quiescent inside the wood, with little to no exposure to the insecticide. Adults can fly away or move, reducing contact and effectiveness. So directing the insecticide at the newly hatched larvae targets the pests when they are most vulnerable and actively causing damage.