Garden Allies: Meet the Beneficial Insects That Work for You

Not Every Bug Is a Bad Guy

Spraying broad-spectrum insecticides kills the very creatures that keep pests in check. Learn to recognize your allies—then attract and protect them.

The Big Three Predators

Insect	Prey	Daily Capacity	Attract With
Ladybug adults & larvae	Aphids, spider mites, whiteflies, scale, beetle larvae	40–50 aphids/hr (larvae)	Dill, fennel, yarrow, alyssum, calendula
Green lacewing larvae ("aphid lions")	Aphids, whiteflies, thrips, mealybugs, caterpillar eggs	60 aphids/hr	Cosmos, coreopsis, dill, angelica
Praying mantis	Everything: beetles, grasshoppers, flies, moths, even each other	Generalist	Tall grasses, shrubs, cosmos

Specialist Microscopic Allies

• Predatory mites (Phytoseiulus, Neoseiulus): Devour spider mites & thrips. Release on infested plants.
• Beneficial nematodes (Steinernema, Heterorhabditis): Soil-dwelling; kill grubs, cutworms, weevils, fungus gnat larvae. Water in at dusk.

Tiny Wasps, Huge Impact

• Trichogramma spp.: Parasitize caterpillar eggs (corn earworm, cabbage looper, tomato hornworm). Release weekly during moth flights.
• Aphytis melinus: Controls California red scale on citrus.
• Metaphycus helvolus: Controls black scale.
• Encarsia formosa: Whitefly parasite—greenhouse standard.
• Various spp.: Parasitize fly pupae (houseflies, stable flies).

How to Keep Them

1. Diverse plantings: Continuous bloom (spring–fall) = nectar/pollen for adults.
2. Water: Shallow dishes with pebbles.
3. Shelter: Mulch, bunch grasses, insect hotels, undisturbed corners.
4. Zero broad-spectrum sprays: Even organic ones (pyrethrin, spinosad) kill beneficials. Spot-treat only.
5. Buy & release: Available from nurseries/online. Release at dusk near prey. Provide habitat so they stay.

The Payoff

A balanced garden needs very little intervention. Your job: observe, identify, and protect the workforce.