you can if you kill the WPM before you harvest ,at this stage I would spray with a 7 to 1 ratio of milk to water , but if you saw it earlier the best remedy Ive found is 3 table spoons of veg oil 2 tbls of dish soap and 2 teaspoons of baking powder per Gallon of water , I have found that its way easier to make a bath and submerge the whole branch into the bath this insures you get as much as you possibly can