There's a real fine line (or actually no line) between the words pest and (I just made it up) non-pest. I know that - like pretty much everything - it's a definition. I remind myself that those 'pests' (insects etc) are just out there in the world too - like us - to survive etc. They just eat and do their own thing, just like we do. We also have to remember that humans destroy much more of the earth than do what we call 'pests'. There's the fine line (or no line).
When we use the insecticides, we may destroy not only what is attacking the orchids, but collateral damage (other insects etc too).
But ------ even though spidermites are the only things that go for some of my orchids here, and that I haven't used it before ------ I'm wondering where certain automated timed sprays can help - at night times that is ---- if it isn't too breezy or windy. The timed pyrethrin sprays. It's possible to buy cannisters in bulk (eg. pestrol brand in australia, or some other brand), and place the cannisters (with their battery operated mist ejector tops) in strategic spots, and have them fire puffs of pyrethrin mist into the air every say 1 hour or so.
Otherwise - occasional applications of azamax, imidacloprid, etc will help. As for snails ------ tactical design for the green-house may be needed.
Fortunately, I've never had snails (except hiding in pots and media of incoming orchids through the mail).
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