
The effect was the opposite of what was intended. After adding them to my feeders they are worse than without them. After reading a little more I found that yellow bees are also attracted to a large surface, they will pool into a pool ball and attack feeders until they dry up. To test I removed a few and used some with protection and others without protection, the unprotected eaters saw bees and wasps but not in such numbers and the threshers had a chance to feed. Do yourself a favor, stay away.

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