Add a little Windex (or anything with ammonia) to the soap spray. It will kill bigger insects more effectively. Doesn't harm the plants, either.
I've got black stink bugs sucking on my beautiful ginger flowers. Nothing has ever bothered the gingers before.
Looked up stink bugs and only got info on the brown marmorated stink bugs. Are these the same? They are all black with one white dot on the middle of the back. Anyway, the soap/windex spray killed them in about 3 minutes. About a dozen bugs on two flower heads.
