Stink bugs are a common household insect recognized for their distinctive defense mechanism. These pests can become a nuisance, particularly when they seek shelter indoors as temperatures drop. Understanding their odor and its causes can help manage their presence.
Describing the Distinct Odor
The odor released by stink bugs is widely described as strong and unpleasant, though perceptions can vary. Many people liken the scent to cilantro or coriander, noting a peppery quality. Some also report a skunky, pungent, or bitter almond aroma. Other descriptions include musty, woody, earthy, or even similar to burnt rubber. The odor can also be characterized as an acrid, somewhat sweet smell, sometimes compared to a very sour, fermenting apple.
The Chemistry Behind the Odor
Stink bugs emit their characteristic odor as a protective measure against potential threats. This smell originates from chemical compounds stored in glands located on their body, specifically between the first and second pairs of legs on the underside of the thorax, and also in glands on the abdomen. When the bug feels disturbed, stressed, or is crushed, these chemicals are released. The primary components of this defensive secretion are aldehydes, notably trans-2-decenal and trans-2-octenal.
These volatile aldehydes easily evaporate into the air, contributing to the strong and lingering nature of the smell. While individual aldehydes have distinct scents, their combination creates the unpleasant odor. Along with aldehydes, the secretions can also contain esters and long-chain alkanes, further contributing to the complexity of the smell.
Dealing with the Lingering Odor
Once released, the odor from stink bugs can linger on skin, surfaces, and in the air. For skin that has come into contact with the bug’s scent, washing with soap and water is a primary step. Applying toothpaste or soaking hands in a mixture of lemon juice and warm water can also help diminish the smell. Some have found success rubbing hands with a stainless steel bar or spoon.
For affected surfaces like furniture or walls, cleaning with mild soap and water or vinegar solutions can be effective. A mixture of hydrogen peroxide, baking soda, and mild dish soap may also be used to deodorize furnishings, but it is advisable to test an inconspicuous area first.
To clear the odor from the air, increasing ventilation by opening windows helps replace stale air with fresh air. Odor neutralizers, such as cotton balls soaked in lemon or peppermint extract, or freshly ground coffee, can be placed in affected areas. Commercial odor-eliminating sprays or gels can also absorb the odor rather than merely masking it. If stink bugs are vacuumed, it is important to empty the bag or canister outdoors immediately to prevent the smell from permeating the vacuum and living space.