Due to long working hours I , unfortunately couldn't monitor my roses this last few weeks. when I went out yesterday they had what looked like black streaks on the leaves. It looked as though a small paint brush had been dipped in black paint and swiped over the leaves. I immediately sprayed with Bayer. What could this be? I couldn't find anything on line that resembled it. I just moved to northern okla from central okla and haven't encountered this before , even though I've been growing roses for about 10 yrs.