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Protect Mason Bees and make an Impact

Predators multiply rapidly in nesting chambers and if not cleaned, then overtime your "bee hotel" will become a "predator hotel"

Pollen Mites

Pollen Mites, are kleptoparasites and are hidden in the flowers in your yard. They impact many species of bees by hitching a ride on bees to infiltrate their nesting spots. Upon entry, they congregate in large numbers within the nesting chamber, feasting on the pollen loaf reserved by the mason bee for her offspring. This results in the starvation of the developing mason bee larvae. They will multiply by the thousands and remain within the chamber until the next spring when mason bees emerge. During this emergence, the Pollen Mites cling onto the backs of the bees, facilitating their spread once again among the flowers in your yard.

Houdini Fly

The Houdini fly is a non-native kleptoparasite. What that means is that it does not attack mason bees directly, but lays its eggs on the pollen meant for the mason bee young inside of the nesting blocks. When the Houdini maggots hatch, they consume the food before the mason bee larvae, which causes them to starve. When the flies are fully formed, they escape from the sealed chambers, earning them the name “Houdini” fly.

Learn more about Hodini Fly here Mason Bee Predator Alert – Invasive Houdini Fly – Rent Mason Bees


Chalkbrood is caused by fungal spores that infest pollen. When the female mason bee collects pollen for her baby she doesn’t realize that some of it is infested with a chalkbrood. The larvae eats the pollen that contains the spore and the spores germinate in the gut and infect the bee and dries it up. The spores multiply and stay in the nesting chamber. When the adult bee emerges, it will crawl through the spores and transfer to other bees and to the flowers.

Summer Predator - Mono Wasp

Mono wasps seek out nesting holes to lay their babies. Female wasps invade solitary bee nests through small crevices or through incomplete or uncapped cells. They use their slender, stinger-like ovipositor to paralyze the bee larvae by inserting it through the wall of the cocoon. After paralyzing the bee larva, the female wasp lays 20-50 eggs inside the mason bee cocoon. When they hatch they consume the bee and then pupate within the bee cocoon for up to a month. They develop quickly and multiple generations can occur each season, causing a growth explosion, where more Mono wasps can seek out mason bee cocoons. Mason bees are susceptible to Mono wasp attacks up to a day before hatching in the spring.

Learn more about mono wasp VIDEO -Predator: Mono Wasp! Learn how to protect your bees – Rent Mason Bees

How you can help Mason Bees

Bee Amazed

Mason bees
visit up to
flowers a day
400 Mason bees
do the work of
honey bees
One Mason bee
block can hold
bees per acre
to pollinate their