Ninebark bush

There is a powdery substance on the bottom leaves of our Ninebark bush. Can you suggest anything I could make or buy or make to solve this problem?…

Thuja occidentalis ‘Smaragd’ (Emerald cedar)

i live in eastern ontarioand have allways trouble with above cedar they are planted on the northside of the house no windprotectin here lots of north west and northeast wind looking for a replacement soiltype is clay with sand and…