Nearly Wild Roses and Black Spot: Cultivar Susceptibility and Spray Timing

Nearly Wild roses in northern South Carolina had persistent black spot despite 2 weeks of Rose Pride spray. One group lost nearly all leaves.

Variety Prone to Black Spot

Nearly Wild is highly susceptible to black spot when conditions favor it. Some roses (like Rugosas) react badly to sprays, dropping leaves. Also, never spray when temperature exceeds 70°F—roses react poorly.

Assessment

Rose Pride is a good product. If the roses don't resent it and it's applied in cool weather, it should work. The variety's susceptibility and spray timing are likely the issues.