Posts Tagged: Polistes dominula

Hunting for Prey

Be careful when you're harvesting an artichoke.

You might find a European paper wasp (Polistes dominula) hunting for a little protein, such as ants, flies and tiny bees to carry back to its nest.

Entomologist Whitney Cranshaw of Colorado State University writes in one of his fact sheets that "European paper wasps rear their young on live insects. They do not produce nuisance problems around outdoor dining that characterize scavenging species, such as the western yellowjacket. European paper wasps will sometimes feed on sweet materials, including honeydew produced by aphids. On rare occasions, they also may feed and damage ripe fruit."

Don't consider the European paper wasp a pest. "European paper wasps have become one of the most important natural controls of many kinds of yard and garden insects," Cranshaw writes. "Most commonly they feed on caterpillars, including the larvae of hornworms, cabbageworms, and tent caterpillars. Sawfly larvae are also commonly taken prey."

As its name implies, it's a native of Europe. Says Cranshaw: 'The European paper wasp is the common paper wasp of Europe. It was first found in North America in the 1970s in the Boston area. Since then it has spread rapidly to much of the northern half of the United States and British Columbia." 

Volunteers at the Häagen-Dazs Honey Bee Haven at the Harry H. Laidlaw Jr. Honey Bee Research Facility, University of California, Davis, recently spotted a paper wasp nest on a lush growth of grey musk sage.

As the paper wasps tended and guarded their nest, honey bees, bumble bees and carpenter bees gathered nectar.

The bees: vegetarians. The wasps: carnivores.

European paper wasp hunting for prey on an artichoke. (Photo by Kathy Keatley Garvey)

uropean paper wasp hunting for prey on an artichoke. (Photo by Kathy Keatley Garvey)

European paper wasps guarding a nest. (Photo by Kathy Keatley Garvey)

European paper wasps guarding a nest. (Photo by Kathy Keatley Garvey)

Another Use of a Potted Plant

When temperatures soar, look for honey bees to head for water resources.

On the grounds of the Harry H. Laidlaw Jr. Honey Bee Research Facility at the University of California, Davis, something as simple as a freshly watered potted plant will do.

Without water to ventilate and cool the hive, the wax inside an overheated hive on a hot day will melt and the brood will die.

However, if you see a honey bee collecting water, you might also see a European paper wasp (Polistes dominula). 

These wasps need water to mix with their saliva and wood fibers to build their nests (right). They also bring back water for the offspring and to cool their nests.

Honey bees stand on the lip of the container or on rocks or sediment. They don't like getting their feet wet. Not so with wasps.

Potted Plant

SOMETHING AS SIMPLE as a watered potted plant can provide honey bees with a good source of water. Honey bees, which don't like to get their feet wet, will stand on the edge of the container, on sediment, or on leaves to sip water. (Photo by Kathy Keatley Garvey)

European Paper Wasp

EUROPEAN PAPER WASP (Polistes dominula) sips water inside a potted plant container. (Photo by Kathy Keatley Garvey)

Water Forager

WATER-FORAGING European paper wasp (Polistes dominula) takes advantage of the standing water inside a plant container. (Photo by Kathy Keatley Garvey)