I built a Mason Bee house about 3 months ago. I just noticed a yellow plug. Do I have Mason Bee larvea?
Mason bees plug the hole with mud. This looks like it might be a leafcutter bee.
By golly, your right! I have leafcutters all over my garden. I never would have thought they would use the nest.
Fascinating and I couldn't be more pleased.
Thank you so much!