Rove Beetle (Dalotia Coriaria)


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Rove beetle (Dalotia coriaria), formerly known as Atheta coriaria, is a native species of a soil-dwelling rove beetle which feeds on small insects and mites. Both adults and larvae are active aggressive predators and are attracted to decomposing plant or animal material and algae, where their hosts are found. While they are beetles, they do not necessarily look like beetles. They are light to dark brown in color, with adults being 3-4 mm long. They are slender with short wing covers. Rove beetles have an interesting habit of curving their abdomen upwards like scorpions and can run or fly when disturbed (usually close to the ground). Since they can actively fly, they rapidly colonize the release area. However, too many Atheta in flight may be because of disturbance to their home.

Use in Biological Control: Rove beetles are used primarily to assist in the control of shore flies and fungus gnats and other small arthropods in the soil or planting media. They also help control soil stages of thrips and feed on most other small soil organisms such as moth flies, springtails, and root mealybugs.

It has been used successfully in vegetable, bedding and potted plant production and seedling and cutting propagation. Atheta adapts well to the various growth media (including rockwool and coconut fiber) and capillary mats used in plant production. They will not survive freezing or flooding conditions.

Life Cycle: The complete life cycle of rove beetles is 21 days at 70°F (21°C), with relative humidity between 40 and 99%. The sex ratio is an equal, 1:1 females to males. Eggs hatch in 3-4 days into larvae, which resemble adults. Pupal chambers are constructed out of silk. Each adult rove beetle consumes 10-20 prey per day. In greenhouse conditions, adults are non-diapausing and can be used year round.

For Best Results: Rove beetle is most effective when applications are started before fungus gnat population becomes well established or while numbers are still low (less than one seen in a trap, per week). One application of Atheta per crop cycle is usually sufficient if started early in the season. Because rove beetle has a longer life cycle and takes longer to establish than the Stratiolaelaps predatory mite, so should be used along with Stratiolaelaps for best results.

Introduction Rates: Rove beetle is most effective when applications are started before fungus gnat populations become well established or while numbers are still low (below 10 per trap, per week). One application of rove beetle per crop cycle is usually sufficient if started early in the season. For soil culture, sawdust bag, or rockwool culture, apply 1 per 10 ft2 (1 m 2 ).

Target Pests: Shore flies (Ephydridae), fungus gnats (Sciaridae), western flower thrips (Frankliniella occidentalis), root aphids

Do not water soil or growing medium 10 minutes before and a few hours after release. To release, rotate the canister (to distribute beetles inside), then open the lid and release in centrally located area where major infestation is onto damp soil (only open when ready to release as they may fly away). Also distribute on floors, greenhouse weeds, under benches, and places where larvae will develop. Leave the canister on its side in the treatment area to ensure release of all mites. Release in the evening or late afternoon within 4 days of being received. Store canister on its side at 45-55° F.

Insects are shipped via UPS Overnight and may take 3 days to process.

In order to make sure we supply everyone with the freshest products available, we do not keep a rolling inventory (except sometimes Stratiolaelaps- which is subject to change). All bugs ship Monday through Thursday. No Friday shipments. Anything placed Friday will be shipped the following week. All bugs are overnighted.

Most Washington and Oregon orders may be shipped Ground, allowing for next day arrival. Any shipping outside of the Pacific Northwest will need to ship UPS 2nd Day or Next Day, depending on weather, location, and beneficial insect. Remember that we are working with a perishable product, and shipping methods reflect the need for your bugs to arrive to you alive and well.

Release throughout the greenhouse at a rate of 100- 1,000 per greenhouse weekly or biweekly, depending on greenhouse history of shore flies and fungus gnats. To ensure reproduction and mating, release 50-100 in one spot in the center of the release area. Be sure to treat areas with wet, exposed areas of soil where fungus gnats and shore flies are likely to breed.

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