Before deciding whether an insect is friend or foe, it helps to know which group it belongs to — because each order has its own patterns of behaviour, life cycle, and role in the garden.
What each order means for your plot:
Orthoptera (grasshoppers, crickets): leaf-chewing insects. Grasshoppers in large numbers can damage crops, but crickets are mainly nocturnal decomposers working through organic matter at soil level.
Diptera (flies, hoverflies): the most varied order in function. Hoverflies are outstanding pollinators and their larvae feed heavily on aphids — one of the most useful groups you can encourage.
Odonata (dragonflies, damselflies): aerial predators that hunt mosquitoes and other small insects on the wing. A garden with dragonflies almost always has clean water nearby and active natural pest control in the air.
Lepidoptera (butterflies, moths): adult butterflies pollinate; their caterpillars can strip foliage. The red admiral you watch nectaring on buddleia in August may well have laid the eggs eating your brassicas in September.
Hemiptera (bugs, aphids, scale insects): the order that causes most damage in British kitchen gardens. Their piercing mouthparts draw sap directly from stems and leaves — aphids, whitefly, and scale insects all belong here.
Coleoptera (beetles, ladybirds): the largest order in the animal kingdom. Ladybirds are key predators of aphids; ground beetles hunt slugs through the night; but vine weevils are a serious pest on container plants and soft fruit.
Hymenoptera (bees, wasps, ants): the most useful order for any garden. Without bees, most fruiting crops fail. Parasitic wasps control caterpillars and aphids without any intervention from the gardener. 🐝🌿🦋🐛
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