Which insect is widely regarded as beneficial to plants due to pest consumption?

Which insect is widely regarded as beneficial to plants due to pest consumption?

• A. Syrphid fly
• B. Aphid
• C. Cabbage looper
• D. Pine weevil

Answer: (A)

Beneficial insects are those that help plants by reducing pest populations. The syrphid fly is a classic example: its larvae are voracious predators of aphids and other soft-bodied pests, so they naturally keep pest numbers down and lessen damage to plants. The adults resemble hoverflies and feed on nectar, but it’s the larval stage that provides the pest-control benefit, which is why this insect is widely valued in gardens and landscapes. Aphids themselves are pests that suck sap and can spread disease, so they’re not beneficial. The cabbage looper is a caterpillar that chews leaves and can cause serious defoliation, and the pine weevil damages seedlings by feeding on bark and cambium. None of these offer the same pest-control advantage as the syrphid fly.

Beneficial insects are those that help plants by reducing pest populations. The syrphid fly is a classic example: its larvae are voracious predators of aphids and other soft-bodied pests, so they naturally keep pest numbers down and lessen damage to plants. The adults resemble hoverflies and feed on nectar, but it’s the larval stage that provides the pest-control benefit, which is why this insect is widely valued in gardens and landscapes.

Aphids themselves are pests that suck sap and can spread disease, so they’re not beneficial. The cabbage looper is a caterpillar that chews leaves and can cause serious defoliation, and the pine weevil damages seedlings by feeding on bark and cambium. None of these offer the same pest-control advantage as the syrphid fly.