10 Best Fungicides For Roses 2025 in the United States

Bonide Captain Jack's Copper Fungicide is a 32 oz ready-to-use spray designed for organic gardening. Its active ingredient is copper, which is effective in controlling a wide range of common fungal diseases like blight, black spot, powdery mildew, and peach leaf curl. The mode of action is straightforward – you simply shake well and spray on affected plants and foliage. This makes it quite user-friendly, especially since it comes in a convenient trigger spray bottle.

The fact that it is approved for organic gardening is a significant plus for those looking to maintain an organic garden. Additionally, it can be used right up until the day of harvest, which provides great flexibility for gardeners. However, as with any copper-based fungicide, there are considerations regarding safety and environmental impact.

While it is generally safe for use in organic gardening, overuse or improper application could potentially harm beneficial insects or contaminate soil and water. So, it’s essential to follow the instructions carefully. If you are looking for an easy-to-use, effective solution for controlling plant diseases in an organic garden, this product offers a good balance of efficacy and convenience. Just be mindful of its environmental footprint and adhere to usage guidelines.

The BAYER CROP SCIENCE 701285 3-in-1 Insect Disease and Mite Control Concentrate is a versatile and comprehensive solution for maintaining the health of your roses, flowers, shrubs, and trees. Its 3-in-1 formula tackles insect infestations, disease, and mites, making it a convenient choice for gardeners dealing with multiple issues. The active ingredients—Imidacloprid, Tau-fluvalinate, and Tebuconazole—are effective against a range of common pests and diseases, including Aphids, Spider Mites, Japanese Beetles, and Black Spot, Powdery Mildew among others.

This fungicide is rainproof and provides up to 30 days of protection, meaning less frequent applications are necessary, which is a time-saver. A 32-ounce bottle creates up to 12 gallons of spray, offering good coverage for larger areas. However, it’s important to note that this product is not available for sale in certain states like NY, CT, CO, MD, MA, ME, and VT. While the safety and environmental impact specifics are not detailed, the product does meet EPA specifications, suggesting a standard level of compliance.

Weighing 2.4 pounds and with easy spray application, it’s user-friendly but care should be taken to follow all safety instructions provided.

Earth's Ally Disease Control Concentrate is a natural fungicide formulated to treat common diseases on roses and other plants, such as powdery mildew, black spot, and blight. Its active ingredient, citric acid, works by creating an environment unfavorable to fungal growth rather than relying on harsh chemicals. This makes it a safer choice for people, pets, and the environment, and it is approved for organic gardening.

The concentrate form is convenient—6 tablespoons mixed with 1 gallon of water produces enough solution to cover a large area, which enhances cost-effectiveness. Application is straightforward via spray, a method typical for fungicides and useful for targeting affected areas on rose leaves and stems.

Since the product uses citric acid, its mode of action may be milder compared to stronger chemical fungicides. This might require frequent applications to maintain effectiveness, particularly in severe infestations. It is recommended for gardeners seeking a gentle, eco-friendly fungicide for rose care, though those needing rapid or long-lasting control might prefer synthetic alternatives.