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The Good Guys
The beneficial insects in our yards and gardens far outnumber the destructive or pesky insects. While some insects become a part of the life cycle of the plants by acting as pollinators, others keep harmful insects in check by parasitizing or feeding on them. When we use chemicals to rid the garden of pests, we are also eradicating beneficial insects, and often create an imbalance that effects the overall health of the garden.
Beneficial Insects
Many beneficial insects are available by mail order. Before you order, make certain you identify the target pest, because most predators or parasites only attack a particular species or group of pests. Ask an agricultural extention agent or a reputable local organic gardening outlet expert or inquire at your library for literature on the subject for your area.
| Beneficial Species | Pests Controlled | Tips |
| Predatory Mite Geolaelaps | Fungus gnats, thrips | Release a minimum order to establish population early in the season. Good in greenhouses and on houseplants. |
| Predatory Mite
Phytoseiulus persimilis |
spider mites | Release 2 to 5 per plant in greenhouses, on strawberries, or on houseplants. They need a moderate temperature (65-75 F) |
| Western
predatory mites
Metaseiulus occidentalis |
European red mite | Release 50-100 per tree to establish a population or 1,000 per tree to control outbreaks. Also good on strawberries. |
| Aphid Midge
Aphidoletes aphidimyza |
aphids | Release 3-5 pupae per plant. Two releases may provide better results. Good in greenhouses, shade trees, orchards, gardens, rose gardens. |
| Braconid
Wasp
Aphidius matricariae |
Green peach and apple aphids | Buy the minimum order for a garden. Plant parsley-family flowers to provide a food source. |
| Lady Beetles
Hippodamia convergens |
aphids | Release minimum order in greenhouses with screened vents. These insects will hibernate in cool greenhouses. |
| Lacewings
Chrysoperla carnea, Chrysoperla rufilabrus |
aphids and thrips | Best to order eggs rather than adults. Distribute widely through the garden - 1 to 3 eggs per plant. |
| Mealybug Destroyer
Cryptolaemus montrouzieri |
mealybugs | Use in greenhouses or cage them on houseplants. use 2 to 5 per plant. Nymphs look like mealybugs. |
| Minute
Pirate Bug
Orius tristicolor |
thrips, mites | Release 1 to 3 per plant. Plant pollen-rich flowers to entice them to stay in your garden. |
| Scale Predator Beetles
Chilocorus spp. Lindorus spp. |
soft scales | Use in greenhouses or on houseplants, citrus, or ornamental trees. Minimum order is sufficient for most needs. |
| Spined
soldier bug
Podisus maculiventris |
Colorado potato beetle, Mexican Bean Beetle | Release 5 per square yard. Look like stink bugs. |
| Greenhouse Whiteflies
Encarsia formosa |
Greenhouse Whiteflies | Release 5 per plant at the first sign of whiteflies. Perform best in warm, bright environment. |
Get a good look at the beneficials before releasing them so that you'll be able identify them in the garden. Many beneficials are very small and you'll need a magnifying glass to identify them.
Release some of the insects directly on or near infested plants, then distribute the remaining insects as evenly as possible throughout the garden.
A few plants rich in nectar such as catnip, dill and yarrow planted throughout the garden will serve as a food source for your beneficial insects.
It can take two to five weeks to see the effects of your beneficials. Keep in mind that you're providing a long term solution, not a quick fix.
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