Osmia californica

Michael emailed me with a question on setting out new nests when the old nests…

Osmia californica comes out late in spring, often their emergence overlaps the latter end of the…

I had to go to my old stomping ground to get this article.  In 10…

Osmia californica cocoons are yellowish with bright orange frass (fecal pellets) Osmia californica cocoons

The Wasmann Journal of Biology  (Vol 32 no 1 1974) has an excellent article on…

Finding anything written about Osmia californica is not easy.  Although I found an article written…

This little mason bee Osmia californica, emerges soon after the early spring mason bee Osmia…