if they are bumblebees and are just pollinating the flowers they are not anything I would worry about. If they are hornets/yellow jackets, You have to find and get rid of the hive. If they are congregating at a certain spot in the yard they probably have a ground nest. Have someone willing to do it (Hubbies are good) spray the daylights out of the hole. Then have the guys who spray help make sure you got the nest. that's my advice.

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