Ignoring the safety aspect, preventive application of pesticides, especially insecticides and miticides, should be avoided, as that’s a sure way to promote the development of resistant strains.
Should it be avoided when acquiring new plants too? I feel that it would be a sane thing to do to take any action of prevention when something new's entering the collection. Even if it's only hydrogen peroxide for general disinfection and a mix of paraffin oil + dish soap as a supposed insecticide (an idea from a MissOrchidGirl video which actually worked very well for me on a heavily infected plant). These are not invasive chemicals but would give me at least a (false?) pretence of protection.
Should it be avoided when acquiring new plants too? I feel that it would be a sane thing to do to take any action of prevention when something new's entering the collection.
My approach is isolate and observe for a month before moving plants into “genpop”. If you wish to treat them, I think the same, very thorough, 3-application regimen should be followed, no matter what you’re treating with.[/QUOTE]