Pest & Disease
Copper fungicide
Copper fungicide is a standard, more effective treatment than neem oil for black spot specifically, but sanitation and airflow still matter more than any spray.
Typical Price
$12 to $22
Best Use
Treating black spot on roses
Our Pick
Bonide Captain Jack Copper Fungicide, 16 oz Concentrate
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What to look for
- Concentrate you dilute yourself
- OMRI-listed for organic gardening
- Labeled for roses, vegetables, and fruit trees