markyscott
Imperial Masterpiece
So far, so good, in my Winter garden. Everything is setting bud but still look to be at least a few weeks or more before they swell and open. I'm trying @markyscott method of winter spraying, got the dormant oil on last weekend while it was warmer. If all goes to plan I'll be spraying the fungicide here in about 4 weeks to hit everything right before bud break. I'm hoping this will give me a leg up on all of the black leaf spot I dealt with last year.
Thiophanate-methyl is also effective on black spot. So you might consider putting down Bonide Infuse as a systematic if this has been a problem for you. Also consider environmental factors. Black spot spore require water - they have to be wet for at least 7 hours before they germinate. So try and make sure you have good air circulation around the plants and make sure they are not shaded such that they stay wet all the time.
S