Fungicide Rotation for Rose Black Spot Control

Black spot fungi can develop resistance if you use the same fungicide repeatedly. The solution: rotate products with different active ingredients every four weeks.

Recommended Rotation Schedule

1. Chlorothalonil (e.g., Daconil)
2. Myclobutanil (e.g., Spectracide Immunox)
3. Triforine (e.g., Ortho Orthenex Rose Spray)
4. Propiconazole (e.g., Bonide Infuse)

Apply each product for four weeks, then switch to the next. Always read the label for rates, timing, and safety precautions. Consistent rotation keeps black spot in check all season.

Fungicide products for black spot rotation