Beneficial insects is a general term for insects that are beneficial to humans and agricultural production

Beneficial insects are insects that directly or indirectly benefit human production and life or the ecological environment. They mainly provide value by preying on pests, parasitizing pests, pollinating plants, or producing useful substances. As opposed to pests, the division between beneficial insects and pests is not absolute; rather, it depends on how the insect affects human interests in a specific environment.

Common beneficial insects can be divided into several major categories. Predatory beneficial insects such as the seven-spot ladybird, green lacewings, mantises, and dragonflies feed on small pests such as aphids and planthoppers; parasitic beneficial insects such as Trichogramma wasps and ichneumon wasps lay their eggs inside pests, thereby suppressing pest reproduction. Pollinating beneficial insects are represented by honeybees and also include some adult butterflies; they help fruit trees, melons, and many crops complete pollination. In addition, silkworms can produce silk and honeybees can make honey, so they are also insects with direct output value for humans.

In agricultural production, the role of beneficial insects is mainly reflected in two aspects: biological control and assisted pollination. Protecting and using natural enemy insects such as ladybirds, green lacewings, and Trichogramma wasps can reduce the use of chemical pesticides, lower control costs, and is also more conducive to ecological balance. Planting nectar-source plants appropriately and avoiding the excessive application of broad-spectrum insecticides both help provide habitat and breeding conditions for beneficial insects.

It should be noted that beneficial insects and pests are not fixed categories. Take ladybirds as an example: most ladybirds prey on aphids and are common beneficial insects in fields, but a few species feed on plant leaves and instead become pests. Adult butterflies can pollinate, but their larvae may chew crop leaves. Therefore, judging whether an insect is beneficial or harmful should be based on a comprehensive consideration of its species, life stage, and environment.