Are you opposed to natural methods or do you just not use anything? Some diamataceous earth on the fan leaves and as a top dress will give them a pretty bad day and should wash right off. I dont know if potassium silicate in a foliar spray would help though i imagine it would to a similar effect. Im working on a spray thats basically the old stage green cleaner using soy bean oil, olive oil, alcohol, castile soap, salt, epsom salt and citric acid. Just figuring out the dilution. Tested 2:1 water to liquid death and kills on contact. Test sprayed a male i flowered to sex, need to give it 24 hours to see. First batch was too potent and caused some damage/left oily residue. I think this too will be too potent but i want to see the progression. I want a kill on contact with no foliar damage. I also want to see how potent i can make it should a really bad problem ever arise.