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Minute Pirate Bugs (Orius insidiosus) are small, aggressive beneficial insects used primarily for biological control of Thrips. Both adults and nymphs are predators and will also feed on Aphids, Spider Mites, insect eggs, whiteflies, and small caterpillars.
Pirate Bugs are especially valuable against Thrips because they attack both immature and adult stages. They actively search leaves, flowers, and other plant surfaces for prey and can continue to survive on pollen when pest populations are low.
Pirate Bugs are true bugs equipped with a sharp, piercing-sucking mouthpart called a rostrum. They grab their prey with their front legs, pierce it, and feed on the body contents.
Although Thrips are their primary target in biological control programs, Pirate Bugs are generalist predators. This makes them particularly useful where several small pests are present at the same time.
Pirate Bugs are supplied in a carrier material that helps distribute them throughout the crop. Before releasing, gently rotate and turn the container to distribute the insects evenly through the carrier.
Spread the contents over plant foliage and throughout the infested area. Concentrate additional material around flowers and areas where Thrips populations are highest.
Release as soon as possible after arrival. If temporary storage is necessary, keep the container out of direct sunlight in a cool location and release the Pirate Bugs as soon as practical.
For best results, distribute the contents throughout the crop rather than releasing the entire container in one location.
Release rates depend on the crop, size of the growing area, and severity of the Thrips infestation. A useful general horticultural starting rate is approximately 2 Pirate Bugs per square meter, or about 1 Pirate Bug per 5 square feet. Heavier infestations and pest hot spots may require higher concentrations.
Adult Pirate Bugs are tiny—about 1/8 inch long—with dark brown to black bodies and contrasting pale markings on the wings.
Young Pirate Bug nymphs are yellowish to orange. As they develop through successive nymphal stages they become progressively darker, eventually developing into winged adults.
Female Pirate Bugs insert their tiny eggs directly into plant tissue, commonly in leaves, stems, petioles, and veins. Because the eggs are inserted into the plant tissue, they can be difficult to see.
Under favorable conditions, development from egg to adult can take approximately three weeks. Adults can live for several weeks, allowing Pirate Bugs to reproduce and establish in suitable crops rather than functioning only as a one-time treatment.
Unlike a contact pesticide, beneficial insects do not produce an instant knockdown. Pirate Bugs must disperse through the crop, locate prey, and begin reproducing.
Flowers and pollen can help support Pirate Bug populations when prey is scarce. This makes them particularly useful in flowering crops such as peppers, strawberries, and many ornamentals.
For persistent Thrips problems, Pirate Bugs can also be used as part of a biological control program with Thrips-eating predatory mites. The mites concentrate heavily on younger Thrips stages while Pirate Bugs actively hunt Thrips on foliage and in flowers.
Pirate Bugs perform well under typical greenhouse and growing temperatures. Temperatures around 68-85°F are generally favorable for activity.
Day length is also important. Orius insidiosus can become much less reproductively active under short-day conditions. Supplemental lighting during winter or other short-day periods can help maintain a longer photoperiod and improve establishment in indoor growing areas.
Avoid broad-spectrum insecticide residues before and after releasing Pirate Bugs. Many conventional insecticides can kill Pirate Bugs directly or interfere with establishment of the population.
If another pest treatment has recently been used, consider its residual effect on beneficial insects before making a release.
Pirate Bugs are primarily recommended for:
For difficult Thrips infestations: Pirate Bugs are particularly useful as the above-ground component of a broader biological control program using predatory mites or other Thrips controls.
Minute Pirate Bugs are predators, and occasionally one may probe or bite a person. The sensation can be surprisingly noticeable for such a tiny insect, but it is temporary and Pirate Bugs do not feed on people or infest homes.
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Tags: thrips, aphids, mites, whitefly, whiteflies, whiteflys, spider mites, caterpillars, Orius insidiosus, Pirate Bugs, Minute Pirates, Minute, ladybugs, lady bugs, thrip control, stink bugs