Predatory Bugs : Stink bugs

Biology

Stink bugs are shield-shaped and range from ¼ to 1 inch in size and usually discharge a disagreeable odor when handled. Although plant-feeding stink bugs are more common, a number of species of predatory stink bugs may be found in gardens including the cryptically colored rough stink bug. Like many predatory bugs, the rough stink bug may feed occasionally on plants but does not cause noticeable damage or injury. Until recently, the Pacific Northwest was fortunate in not having any stink bug species capable of causing serious damage to plants or crops. The invasion of our area by the marmorated Asian stink bug (Halyamorpha halys), which is very similar in appearance to the rough stink bug, has changed this. Identification should be sought for any stink bug found in the garden before encouraging its persistence.

Prey or Pest Targeted

• Mites, aphids, leafhoppers, thrips, caterpillars, mealybugs, beetles, scale insects, insect eggs

Attracting and Keeping Natural Enemies and Pollinators in Your Yard and Garden

• Avoid regular use of synthetic, broad-spectrum pesticides. Infrequent use of certain narrow-spectrum pesticides is more compatible with some beneficials but generally the less chemical inputs there are, the greater and more diverse the beneficial insect community will be. Extensive lawns are also not conducive to attracting and retaining a diversity of beneficial insects, mites and spiders. Minimize lawn areas and maximize shrub and bush plantings. Many beneficials reside naturally in riparian and other ‘natural’ areas near to many back yards. Natural dispersion from these refuges ensures that some beneficials will visit back yards but they will not stay unless food, host and shelter resources are available. Native plants have closer affinities with native insects and therefore provide most of these resources. A garden with a good diversity of local native flora in and around back yards, will improve the abundance and diversity of local, beneficial arthropods. Native flora also provides natural overwintering sites for many beneficial insects and it is useful to leave at least a small area of native vegetation undisturbed during fall and winter.
• Some kinds of beneficial insects (e.g. lady beetles, lacewings, predatory mites) are available for purchase from commercial suppliers. However, benefits from introducing these beneficials are usually limited and short-lived. Upon release, commercially obtained lady beetles and lacewings often disperse and may rapidly leave your backyard despite the presence of prey and suitable nectar resources. Generally, it is more effective and sustainable to create a garden habitat that will be colonized by beneficials naturally.