What is an Ensign Wasp?
If you have seen an insect in your house that resembles a fly but isn't one, it's probably an ensign wasp. Also known as hatchet wasps, these oddly shaped insects are black in color and have triangular and flag-like abdomens. Their abdomens move up and down, making it look like a flag that's being signaled, hence the name ensign wasp.
They belong in the family Evaniida and feed on nectar and honeydew deposited on leaves by aphids. Adults can reach ¾ inches long.
Ensign Wasp Sting
Unlike many other wasps, ensign wasps are not aggressive and do not sting humans or pets. Their unique appearance often causes concern, but there’s no need to worry—these insects are harmless to people.
How are Ensign Wasps Beneficial?
Unlike other wasps or bees, ensign wasps are not known to sting or harm humans or pets in any way. However, this is not why you should refrain from squashing an ensign wasp. As hatchet wasps reproduce, they help in controlling cockroach infestations.
Roaches are one of the most versatile pests that are hard to eradicate fully. This is because, even after exterminating live roaches, their eggs can survive and hatch months later. This is where ensign wasps come in. When a female hatchet wasp wants to lay eggs, it looks for cockroach egg cases, referred to as ootheca, to lay her eggs inside.
When ensign wasp eggs hatch, the larva will eat the cockroach eggs within the case. The larva will remain inside and only emerge as an adult after pupating.
What Does the Presence of an Ensign Wasp Signify?
Ensign wasps often feed around areas where they can breed. The presence of one indicates that there may be cockroach egg cases or even adult roaches within your house. So, once you spot an ensign wasp, allow it to do free roach extermination for you. However, you should also take action and call Safehaven Pest Control. Search for ootheca and other signs of roaches in crevices. Ensign wasps can help prevent future infestations.
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