Counts and mean weight per site of Osmia cornifrons that tested positive (+) or negative (-) based on PCR screens for Ascosphaera (Asc), Aspergillus (Asp), Paenibacillus (Pae), and multiple microbes (mul).

a Mean values of the weight in milligrams (mg) of live bees that were then screened for the presence of microbes (mean weight), of only those bees testing negative (mean weight -), and of only those bees testing positive for one or more microorganism(s) (mean weight +).* Mean weight of bees testing positive versus negative were significantly different based on a Welch's t-test at p Counts and mean weight per site of Osmia cornifrons that tested positive (+) or negative (-) based on PCR screens for Ascosphaera (Asc), Aspergillus (Asp), Paenibacillus (Pae), and multiple microbes (mul).