Richard from Darien, Ct writes
While the Bonide INFUSE Systemic Disease Control is labeled for some conifer diseases, it is not labeled for needle rust on blue spruce – only on Douglas Fir and Shasta Fir. We would instead recommend Clearys 3336F for various rusts. Be sure that you have the correct disease identification so that you can use the best treatment.
Answer last updated on: 03/23/2020