nope, the only thing that is known to maybe work is alcohol sprayed or dabbed on the areas after the protective fluff has been brushed off....and repeat, and repeat and clean all the greenhouse nooks and crannies as well. When I had it and googled, I found a bloke who had lost his whole cactus collection to it. Its a good idea also to prune affected plants that can be pruned very hard and remove and burn the prunings or give them a good dousing in alcohol (surgical spirit) before putting them in the rubbish, don't compost them. This will give you less area to treat.....but plan for the worst and do, as I said, give your conservatory a good clean and spray around with alcohol.