Stomach poison insecticides are most effective against which type of insects?

Stomach poison insecticides are designed to be ingested by insects, which makes them particularly effective against chewing insects. These types of insects have mouthparts adapted for biting and chewing plant material, allowing them to consume the insecticide when they feed on treated plants. When they ingest the poison, it disrupts their biological functions, leading to their mortality.

In contrast, sucking insects, such as aphids or spider mites, feed by piercing plant tissues and sipping sap. They may not consume the stomach poisons in the same way that chewing insects do, making these insecticides less effective against them. Flying insects may avoid treated areas or surfaces, and stinging insects, which generally are not plant feeders, are not impacted by ingestion in the same manner as chewing insects. Therefore, the mechanism of action of stomach poison insecticides aligns closely with the feeding behavior of chewing insects, making this the most appropriate choice.