10 Informational Facts About Baby Stink Bugs(Nymphs)

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If you think adult stink bugs are a nuisance, just wait until you meet their babies. Baby stink bugs, or nymphs, are small but mighty, and they’re not afraid to let you know it. Here are 10 informational facts about baby stink bugs that will make you think twice before squishing one.

Continue reading to find out more about stink bugs. 

What do baby stink bugs look like? 

10 Informational Facts about Baby Stink Bugs Nymphs

Baby stink bugs are small and black with a reddish-brown body. They are in the different stages of becoming adults and will eventually have black bodies and wings.

Like their mother stink bug, a baby stink bug’s characteristics are its hexagonal body. They are also generally smaller than the adults and can be in various colors, including black, brown, green, and yellow.

What do stink bug eggs look like?

What do stink bug eggs look like?

Baby stink bugs, also known as nymphs, are the eggs of the stink bug. They look like tiny pistachio nuts and are usually barrel-shaped and white to pale green. The female stink bug lays her eggs on the underside of the leaves of her host plant. 

Once the female stink bug mates, she will lay 20 to 30 egg batches. These eggs are tiny and barrel-shaped, and they are light green. After four to five days have passed since hatching, the nymphs will enter their next stage.

10 Informational Facts About Baby Stink Bugs (Nymphs) 

Pupa stage in the life cycle of a harlequin ladybird, Harmonia axyridis

Stink Bug Odor

The smell that baby stink bugs produce is used to protect against predators. It is produced in a gland on their abdomen, and the chemical composition is made of chemicals used as food additives. These additives are present in cilantro, which likely gives the plant its distinct odor.

Interestingly, stink bugs emit a smell akin to strong herbs and spices like cilantro. Moreover, these pests can linger for hours once they have invaded your house. These nuisance pests are also called pantry pests. 

Green Stink Bug Nymphs

Green Stink Bug Nymphs

The green stink bug has five nymph stages, and the appearance of the nymphs changes as they grow. The first stage is very small and black with orange markings. They are incapable of flying during this stage.

The second stage is also small but becomes black with a green head, and the abdomen assumes a green color with some spots of black. The next stages are similar to the adult form but without wings.

Brown Stink Bug Nymphs

Brown Stink Bug Nymphs

The brown stink bug is easily identifiable by its mottled, dark brown color and the white bands on its abdomen. Brown Marmorated Stink Bug nymphs are small and dark, with a reddish head and thorax.

The adult form of this insect resembles a tick with red eyes and a rust-red body with black spots. Adults have dark and light bands on the sides of their abdomen.

Growth of baby stink bugs – Metamorphosis and Structure System 

Baby stink bugs, also known as nymphs, go through a development process in which they grow and change into adults. This process is called metamorphosis.

Baby stink bugs are small and mostly black at this stage, but they will eventually grow wings and become brown. One interesting thing about baby stink bugs is that they already give off a pungent smell. 

The baby stink bugs, or nymphs, go through five stages of development and reproduction before reaching maturity like their adult counterparts.

The first stage is when they are small and orange with red speckles on their backs. They are mostly black in the later developmental stages.

Stink bugs collect in large clusters.

Stink bugs collect in large clusters.

Stink bugs release a chemical called the aggregation pheromone, which attracts other stink bugs to the area. This chemical also causes them to produce their characteristic smell. Their stink is caused by a different chemical called methyl salicylate.

Stink bugs have no larvae.

Stink bugs undergo complete metamorphosis (or holometabolous type), meaning they have no larval and pupal stages. It is different from many other insects, which have a larval stage and look very different from adults. 

Stink bugs sting but don’t bite.

Brown marmorated stink bugs are not able to sting or bite. They rely on their characteristic smell to deter predators. When disturbed, they release an unpleasant odor that can linger for some time.

Stink bug’s eggs look like pistachio nuts.

Stink bug's eggs look like pistachio nuts.

Baby stink bugs, or nymphs, hatch from eggs that look like tiny pistachio nuts. These eggs are barrel-shaped and white to pale green, depending on the species. Females lay eggs in clusters of between 20 and 30, but 28 is the average number of eggs laid by each female.

Stink bugs have natural enemies.

The stink bug has a few natural enemies, but they are not enough to control the population. These natural enemies include insects that feed on them, such as spiders and assassin bugs.

However, these predators are not aggressive enough to take down the brown marmorated stink bug.

Stink Bugs can spread the infestation.

Stink Bugs can spread the infestation.

Stink bugs are found in the late summer and autumn months, typically when the weather cools. They can be found on the sunny sides of homes, businesses, and crops. Growers can often detect an infestation by the damage they cause to crops.

The consperse stink bugs infestation also depends on sodium vapor lights, building interiors, winter weather conditions, cargo containers, food sources, and warm temperatures.

Trap and pest control the stink bugs using a vacuum cleaner, base coloration, quality silicone bags, insecticides, fertilization in fruit trees, and seal entry points. 

What are the differences between stink bugs vs. kissing bugs?

There are a few key differences between stink bugs and kissing bugs. For one, kissing bugs bite and suck blood from humans and animals, while stink bugs do not.

Additionally, kissing bugs can carry a parasite called Trypanosoma cruzi that causes Chagas disease- a potentially deadly illness. Another difference is the life stages of the two insects: stink bugs have three different stages while kissing bugs have only two.


There are different stink bugs, and depending on the species, they can be either pests or beneficial insects. Baby stink bugs, also known as nymphs, are not as invasive as adults, but that does not mean you should ignore them. In conclusion, baby stink bugs are a nuisance that can be prevented by simply sealing up any tiny holes around your house.

About the author

A biotechnologist by profession and a passionate pest researcher. I have been one of those people who used to run away from cockroaches and rats due to their pesky features, but then we all get that turn in life when we have to face something.