Karen from Muskego, Wi writes
My blue spruces have Rhizosphaera needlecast. How much of the Spectro 90 do I use for a gallon water? My crabapple trees have scab. How much of Spectro 90 do I use per gallon of water?
You would use 1-2 tablespoons of the Clearys Spectro 90 WDG per gallon of water and make sure to spray thoroughly as this is a contact fungicide. You may see a white powdery residue on the needles for a few days but this will eventually wear off. It is recommended that you spray every 3-4 weeks until the conditions are no longer favorable for disease development. Since this product is a curative, you will use it when the disease appears so this could be at any time of the year.
Answer last updated on: 03/12/2018
