Nature is filled with "good bugs", crawling and flying creatures whose diet consists mainly of the pests that ravage garden plants. Here is a list of those good bugs and the plants that they like to visit for food and shelter. Intersperse these plants among the "problem pest areas" in your yard. Remember, though: Many chemical sprays work on both bad and good bugs. To keep the good bugs in your yard, eliminate insecticide use in the areas where they live and work. Our thanks to Steve Zien of Living Resources Company for helping to match up the good bugs with good homes. For more information about beneficial insects, there are two wonderful books (which include the pictures below) from the University of California Press, both written by UC Davis Entomologist Mary Louise Flint: "Pests of the Garden and Small Farm" and "The Natural Enemies Handbook".
LACEWINGS (Chrysopa spp.)
Beautiful little green or brown insects with large lacy wings. Individual white eggs are found laid on the ends of inch-long stiff threads. It is the larvae (which look like little alligators) that destroy most of the pests. They are sometimes called aphid lions for their habit of dining on aphids. They also feed on mites, other small insects and insect eggs.
The lacewing, which is also attracted to well-lit windows and screens on spring and summer evenings.
Plants that attract lacewings:
Achillea filipendulina
Fern-leaf
yarrow Anethum graveolens
Dill Angelica gigas
Angelica Anthemis tinctoria
Golden
marguerite Atriplex canescens
Four-wing
saltbush Callirhoe involucrata
Purple
poppy mallow Carum Carvi
Caraway Coriandrum sativum
Coriander Cosmos bipinnatus
Cosmos
white sensation Daucus Carota
Queen
Anne's lace Foeniculum vulgare
Fennel Helianthus
maximilianii Prairie
sunflower Tanacetum vulgare
Tansy Taraxacum officinale
Dandelion
LADYBUGS
Recognized when they are adults by most gardeners. However, the young larvae, black with orange markings, eat more pests than the adults, and they can't fly. Yellowish eggs are laid in clusters usually on the undersides of leaves.
Plants that attract ladybugs:
Achillea filipendulina
Fern-leaf
yarrow Achillea millefolium
Common
yarrow Ajuga reptans
Carpet
bugleweed Alyssum saxatilis
Basket of
Gold Anethum graveolens
Dill Anthemis tinctoria
Golden
marguerite Asclepias tuberosa
Butterfly
weed Atriplex canescens
Four-wing
saltbush Coriandrum sativum
Coriander Daucus Carota
Queen
Anne's lace Fagopyrum esculentum
Buckwheat Foeniculum
vulgare Fennel Helianthus
maximilianii Prairie
sunflower Penstemon strictus
Rocky Mt.
penstemon Potentilla recta
'warrenii' Sulfur
cinquefoil Potentilla villosa
Alpine
cinquefoil Tagetes tenuifolia
Marigold
- lemon gem Tanacetum vulgare
Tansy Taraxacum
officinale
Dandelion Veronica spicata
Spike
speedwell Vicia villosa
Hairy
vetch
HOVERFLIES
Also known as syrphid fly, hover fly or flower fly. Adults look like little bees that hover over and dart quickly away. They don't sting! They lay eggs (white, oval, laid singly or in groups on leaves) which hatch into green, yellow, brown, orange, or white half-inch maggots that look like caterpillars. They raise up on their hind legs to catch and feed on aphids, mealybugs and others.
Plants that attract hoverflies:
Achillea filipendulina
Fern-leaf
yarrow Achillea millefolium
Common
yarrow Ajuga reptans
Carpet
bugleweed Allium tanguticum
Lavender
globe lily Alyssum saxatilis
Basket of
Gold Anethum graveolens
Dill Anthemis tinctoria
Golden
marguerite Aster alpinus
Dwarf
alpine aster Astrantia
major
Masterwort Atriplex canescens
Four-wing
saltbush Callirhoe involucrata
Purple
poppy mallow Carum Carvi
Caraway Chrysanthemum
parthenium Feverfew Coriandrum sativum
Coriander Cosmos bipinnatus
Cosmos
white sensation Daucus Carota
Queen
Anne's lace Fagopyrum esculentum
Buckwheat Foeniculum vulgare
Fennel Lavandula angustifolia
English
lavender Limnanthes douglasii
Poached
egg plant Limonium latifolium
Statice Linaria
vulgaris
Butter and eggs Lobelia erinus
Edging
lobelia Lobularia maritima
Sweet
alyssum - white Melissa officinalis
Lemon
balm Mentha pulegium
Pennyroyal Mentha spicata
Spearmint Monarda fistulosa
Wild
bergamot Penstemon strictus
Rocky Mt.
penstemon Petroselinum
crispum
Parsley Potentilla recta
'warrenii' Sulfur
cinquefoil Potentilla villosa
Alpine
cinquefoil Rudbeckia fulgida
Gloriosa
daisy Sedum kamtschaticum
Orange
stonecrop Sedum spurium &
album Stonecrops Solidago virgaurea
Peter Pan
goldenrod Stachys officinalis
Wood
betony Tagetes tenuifolia
Marigold
- lemon gem Thymus serpylum
coccineus Crimson
thyme Veronica spicata
Spike
speedwell Zinnia elegans
Zinnia -
liliput
PARASITIC MINI-WASPS
Parasites of a variety of insects. They do not sting! The stingers have been adapted to allow the females to lay their eggs in the bodies of insect pests. The eggs then hatch, and the young feed on the pests from the inside, killing them. After they have killed the pests, they leave hollow "mummies."
Braconid wasps feed on moth, beetle and fly larvae, moth eggs, various insect pupae and adults. If you see lots of white capsules on the backs of a caterpillar, these are the braconid cocoons--leave the dying caterpillar alone!
Ichneumonid wasps control moth, butterfly, beetle and fly larvae and pupae. Trichogramma wasps lay their eggs in the eggs of moths (hungry caterpillars-to-be), killing them and turning them black.
The black dot in the middle of the picture is an emerging encarsia wasp, which is hatching out of an immature stage of a (now dead) whitefly. The wasp lays its eggs onto young whiteflies.
Plants that attract parasitic mini-wasps:
Achillea filipendulina
Fern-leaf
yarrow Achillea millefolium
Common
yarrow Allium
tanguticum
Lavender globe lily Anethum
graveolens
Dill Anthemis tinctoria
Golden
marguerite Astrantia major
Masterwort Callirhoe involucrata
Purple
poppy mallow Carum Carvi
Caraway Coriandrum sativum
Coriander Cosmos bipinnatus
Cosmos
white sensation Daucus Carota
Queen
Anne's lace Foeniculum vulgare
Fennel Limonium latifolium
Statice Linaria vulgaris
Butter
and eggs Lobelia erinus
Edging
lobelia Lobularia maritima
Sweet
alyssum - white Melissa officinalis
Lemon
balm Mentha pulegium
Pennyroyal Petroselinum crispum
Parsley Potentilla recta
'warrenii' Sulfur
cinquefoil Potentilla villosa
Alpine
cinquefoil Sedum kamtschaticum
Orange
stonecrop Tagetes tenuifolia
Marigold
- lemon gem Tanacetum vulgare
Tansy Thymus serpylum
coccineus Crimson
thyme Zinnia elegans
Zinnia -
liliput
Parasites of caterpillars (corn earworm, imported cabbage worm, cabbage looper, cutworms, armyworms), stink bug, squash bug nymphs, beetle and fly larvae, some true bugs, and beetles. Adults are 1/3 to 1/2 inch long. White eggs are deposited on foliage or on the body of the host (in the picture below, the tachinid fly is approaching the larvae of an elm leaf beetle). Larvae are internal parasites, feeding within the body of the host, sucking its body fluids to the point the pest dies.
Plants that attract tachinid flies:
Anthemis tinctoria
Golden
marguerite Fagopyrum esculentum
Buckwheat Melissa officinalis
Lemon
balm Mentha pulegium
Pennyroyal Petroselinum crispum
Parsley Phacelia tanacetifolia
Phacelia Tanacetum vulgare
Tansy Thymus serpyllum
coccineus Crimson
thyme
MINUTE PIRATE BUGS (Orius spp.)
Tiny (1/20 inch long) bugs that feed on almost any small insect or mite, including thrips, aphids, mites, scales, whiteflies and soft-bodied arthropods, but are particularly attracted to thrips in spring.
DAMSEL BUGS (Nabis spp.)
Feed on aphids, leafhoppers, plant bugs, and even small caterpillars as adults and nymphs (teenagers). They are usually dull brown and resemble other plant bugs that are pests. Their heads are usually longer and narrower then most plant feeding species (the better to eat with).
BIG EYED BUGS (Geocoris spp.)
Small (1/4 inch long), grayish-beige, oval shaped) bugs with large eyes that feed on many small insects (e.g., leaf hoppers, spider mites), insect eggs, and mites, as both nymphs and adults. Eggs are football shaped, whitish-gray with red spots.
Plants that attract minute pirate bugs, damsel bugs and big eyed bugs:
Carum Carvi
Caraway Cosmos bipinnatus
Cosmos - white
sensation Foeniculum vulgare
Fennel Medicago sativa
Alfalfa Mentha spicata
Spearmint Solidago
virgaurea
Peter Pan goldenrod Tagetes tenuifolia
Marigold
- lemon gem