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Concealed Nests
Paper Wasps
Bee Swarming
Concealed Nests
The most challenging wasp nests to control are those that are concealed in voids behind walls or in attics. Often, the only evidence of the nest is wasps flying back and forth through a crack or hole in the home.
Aerosol insecticides usually do not work very well against hidden nests. The best method is to apply a small amount of insecticidal dust or drill small (about 1/8 inch) holes to deliver the insecticide into the nest area.
When treating wasp nests hidden in building voids, we may use the following insecticide dusts:
bendiocarb
chlorpyrifos
boric acid (will be slow acting)
Paper Wasps
The name "paper wasps" typically refers to members of the vespid subfamily Polistinae, though it often colloquially includes members of the subfamilies Vespinae (hornets and yellowjackets) and Stenogastrinae, which also make nests out of paper. Twenty-two species of Polistes paper wasps have been identified in North America and approximately 300 species have been identified worldwide. The Old World tribe Ropalidiini contains another 300 species, and the Neotropical tribes Epiponini and Mischocyttarini each contain over 250 more, so the total number of true paper wasps worldwide is about 1100 species, nearly half of which can be found in the Neotropics.
Bee Swarming
Swarming is a natural division of the hives population. When the number of workers exceeds the capacity of the hive, the workers will raise a second queen and she will travel to a new location with half of the colonies worker bees and Drones. Generally this occurs in the Spring or Summer months - 4 to 5 weeks after the queen begins laying eggs after Winter. Each hive can swarm several times a year, often until August in Eastern Ontario.