English: kind of mason bee, perhaps Osmia corn...

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It is important to control mites in your mason bees to keep them healthy. One method is to clean them after the bees have matured in the fall (see the October Growing Tips). Another method is to manage the temperatures they are maintained at during the summer as they mature, particularly in the Pacific Northwest and other mild wet spring areas across the country. See the article ‘Mite Control for Mason Bees‘ for easy, specific instructions to keep the mites under control.

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