Aphids - Ladybugs, tiger beetles, damsel bugs, lacewings
Cabbage Worm (Offspring of cabbage moths, the white moths you see flitting around your garden) - Ichneumonid wasps
Corn Earworm - Pirate bugs, big eyed bugs, flower bugs, ground beetles, hover flies, trichogramma wasps
Colorado Potato Beetles - Stink bugs, ground beetles, ladybugs, tachinid flies
Cucumber Beetles - Tachinid flies, stink bugs, spined soldier beetles
Cutworm - Ground beetles, tachinid flies
European Corn Borer - Ichneumonid wasps, hover flies, flower bugs
Flea Beetles - Braconid wasps
Grasshoppers - Robber flies
Mexican Bean Beetles - Spined soldier beetles, lacewings, big eyed bugs, assassin bugs
Mites - Predatory mites, lacewings, aphid midges
Scale - Ladybugs, chalcid wasps, lacewings
Spider mites - Spider mite destroyer
Thrips - Lacewings, damsel bugs
Whiteflies - Chalcid wasps, ladybugs
How to Attract Beneficial Insects
So now you've gone out to the garden and identified the major pests. Or if you're in the Northern hemisphere, you've checked your garden journal (what, you don't have a garden journal -I'll get to that later) to see which pests were bothering your plants. Now you need to add plants to your garden to attract the appropriate beneficial insects. Here's a list of beneficial insects and which plants you can use to attract them.
Aphid midges - Dill, mustard, sweet clover, herbs
Big eyed Bugs - Potatoes, clover, green beans,
Damsel Bugs - Clover, alfalfa,
Flies (Hover, Robber and Tachinid) - Anthemis, sunny red cosmos, zinnia, tansy, buckwheat, Queen Anne's lace, yarrow , sweet alyssum, caraway, dill, coreopsis, parsley, ivies
Flower Bugs (Minute Pirate Bugs) - Alfalfa, corn, daisies, yarrow, stinging nettles, clover, sweet alyssum, goldenrod, teasel
Ground Beetles - Leave areas weedy including goldenrod and wild amaranth
Lacewings - Angelica, corn, sunflowers, flowering weeds, tansy, caraway, white sensation cosmos, sweet alyssum, dandelion, goldenrod.
Ladybugs - Tansy, angelica, scented geraniums, dill, dandelion, yarrow, wild carrot
Pirate Bugs - Alfalfa, daisies, yarrow, stinging nettles, clover,
Predacious Thrips - Nectar producing plants such as rosemary, thyme, lemon balm, hyssop
Predatory Mites - Nectar producing plants such as rosemary, thyme, lemon balm, hyssop