Shield bugs have prothoracic glands (in their thoraces, between the first and second pair of legs) that produce a foul-smelling liquid, which is used defensively to deter potential predators and is sometimes released when the bugs are handled.

What do shield bugs smell like?

The brown shield bug – whose scientific name is Halyomorpha Halys – is an invasive species mostly known for spoiling fruits and vegetables in the US and south-east Asia. Known for its almond-like smell, the pest has a bad habit of ruining foods, especially apples and cucumbers.

Do green shield bugs smell?

Both adults and nymphs suck plant sap. It is sometimes called a green stink bug as it produces a pungent odour from special glands if handled or disturbed.