As I said the problems and solutions are very varied. I consider myself a beginner in the subject as I am just a home gardener really, but I did a course in commercial. So feel free to school me. What I basically know is. Medium to large scale commercial is obviously pesticides, herbicides incl fungicides and barriers… reading about a small number of those chemicals on wikipedia made me wince.
For organic especially permaculture non toxic solutions prevail. These range from barriers like moats to cohabitation with certain plants, animals and insects to smells to non toxic sprays.
Different plants, latitudes, seasons, weather pose different problems and solutions. So like I said only single solution that exists is agent orange jk. Actually the only real single solution is a big barrier ;). So that’s why the solution I offered was built around arming folks with information.
But your solution will work for many insects and some fungi (moulds, mildew) so its worth implementing as that covers a lot :). A water proof pellet/dust dropping tool could work too.
At home for moths I use netting or pesticide dust, companion plants, for snails a simple moat or pellets, mixes like dishwatering liquid for mould and for my cats a nasty smelling crystalline substance. I have friends on lifestyle blocks who use African guinea fowl for insects and companion plants that draw in beneficial insects and birds.
Hope that helps.