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You can start by using a hose (I use a jet washer) and wash as many as you can off the trunk and branches most sprays that are effective on greenfly will also treat mealey bug but have have to be persistant as they hide in nooks and crannys in the bark you could also use a soap based pesticide spray but there is no quick or easy treatment.
Tricky customers to be sure. I can suggest a 3-way product SB Invigorator which works by a physical mode rather than chemical so its safer for users & edible/ non-edible crops without harming useful predators. Also acts against Powdery Mildew.....
Richard@Progreen