I feed our stink bugs to the chickens, but I don't think they're the same as yours. I'm pretty sure they don't spray and I've never seen them in the numbers you have there! The joys of a tropical climate, I guess.

My biggest pest on my orange tree is scale. I'm constantly scraping it off, thinking I've got it under control, then it's back the following year. Thankfully I've only had leaf miner once on it. I recall warnings from other gardeners a few years back to look out for gall wasp signs, when it somehow got brought in from Queensland. I've not heard anything since, though, so they mustn't thrive in our dry climate.