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Excellent source for fact sheets on harmful pests
Thanks for the graphics of:    Aphidius Ervi, Cabbage aphid

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More than a sting
This predator packs quite a whollop if you tick him off but did you know that they are one of the largest group of beneficial predators. You could actually hear the crunching as I took this photo of him devouring this tent caterpillar. See Good Bugs Bad Bugs for more.