Phisherman wrote:

Spring prevention goes a long way. Keep roses pruned for appearance
and better air circulation. Never get the leaves wet. If black spot
appears, it is usually too late to use fungicide treatments but you
can heavily prune the rose bush (and discard the clippings in the
trash). You may want to replace your roses with types that are
resistant to fungus. Roses require a lot of maintenance.


I have roses at the head of each row in my vineyard. I spray them the same
time I spray the vines. I normally use both sulphur and Penncozeb at the
rate of:
Sulphur - at rate of 3.84 oz per 4 gallon packpack spray tank
Penncozeb - at rate of 2.56 oz per 4 gallon backpack spran tank

If you don't have a lot of roses, you could just just adjust for half a
backpack tank etc.

You can also use Ziram in place of the Penncozeb or Tenncop (a Copper
fungicide) in place of the Sulphur.

If you already have a black spot problem, you might consider using a
systemic such as Nova at the rate of about 5 grams per back pack spray
tank.

The Sulphur and Copper will do nothing for the black spot but they are good
for powderly mildew which Penncozeb or Ziram are not too good at
controlling.