I have a mission for anyone who is a gardener/inventor.
My basil continually suffers from white fly infestations. I usually spray it with a garlic and pyrethrum spray every few days, but the little buggers are impossible to get rid of because they lurk on the underside of the foilage - and spraying stuff on them from above doesn't get to where they lurk. The only effective way to spray under the leaves is to pick up the pot of basil, lay it down on one side and then spray under the leaves. I generally have to put it on each side and spray four times all up to get under every leaf.
This is a problem if the plant is actually in the ground in the garden, rather than in a pot.
I have a solution. I need a crafty person to come up with a spray nozzle somewhat like a bottle of Toilet Duck - the idea being that you can spray under the leaves without having to tilt the plant over.
I'm prepared to split the royalties 50/50.