I just put out CATCHY wasp pheromone traps plus strawberry jam under punctured jar lids with sugar water in the jars half full.. I've caught 62 in about 4 hours. None on my grapes yet even though a few are at 20 Brix today. I put the jars on top of vineyard endposts and hanging traps just below the jars i.e. wasp Disneyworld. Update I've caught 83 in 5 hours. Traps are working. Unfortunately black and white wasps only go for the jam jars.
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