Aphids. When and how to control

I’m with you in the old thread now. had green ones on the native plums this morning, first I’ve seen this year. last year they attacked my big plum tree, it was a plague of them.

I’ve got some mantis cases on the trees there and don’t want to hurt those, so I don’t want to spray. not too sure how to beat them back right away before they explode though.

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