Grey leaf spot is a common plant disease that can hinder growth and reduce yields on garden varieties. Selecting a fungicide that targets leaf spot and related foliar diseases can help protect roses, vegetables, and ornamentals. This article reviews five top fungicides, highlighting their active ingredients, spectrum of control, and recommendations for use. All options are suitable for home gardens and can help manage grey leaf spot while supporting overall plant health.
| Product | Brand | Key Use |
|---|---|---|
| Bonide (BND141) Sulfur Plant Fungicide | Bonide | Controls rust, leaf spot, powdery mildew; for fruits, vegetables, ornamentals |
| Atticus Artavia 2 SC Azoxystrobin Fungicide | Atticus | Broad-spectrum turf and landscape protection; leaf spot, anthracnose, brown patch |
| Earth’s Ally Disease Control Concentrate | Earth’s Ally | Powdery mildew, blight, black spot, leaf spot; safe for people and pets |
| Safer Brand Garden SG5450 Fungicide Ready-to-Use Spray | Safer | Powdery mildew, black spot, leaf spot, rust; OMRI Listed for organic use |
| BONIDE 142 Sulfur Plant Fungicide | Bonide | Controls rust, leaf spot, powdery mildew; also listed for animal use |
Bonide Sulfur Plant Fungicide (BND141) – 1 lb
Bonide Sulfur Plant Fungicide provides micronized sulfur for preventative and curative control of several fungal diseases, including rust, leaf spot, and powdery mildew. The product is versatile for use on fruits, vegetables, and ornamentals in gardens, helping reduce foliar infections. It also notes potential utility as a pesticide in non-plant applications, though users should follow label directions for any such use. Application in accordance with crop type and timing is essential to maximize effectiveness against grey leaf spot and related diseases.
Atticus Artavia 2 SC Azoxystrobin Fungicide – 16 oz
Artavia 2 SC contains azoxystrobin as the active ingredient, offering systemic movement within the plant for comprehensive protection. It targets a broad range of fungi, including leaf spot, anthracnose, brown patch, and rhizoctonia. The formula is designed for turf and landscape use, delivering top-to-bottom plant defense by moving through leaves and roots. This product provides versatile protection for lawns and ornamentals, contributing to disease control against grey leaf spot with a single, broad-spectrum solution.
Earth’s Ally Disease Control Concentrate – 32 oz
Earth’s Ally Disease Control Concentrate is a natural option formulated with citric acid to safely treat and prevent common plant diseases including powdery mildew, blight, and leaf spot. It emphasizes a safer profile for people, pets, and the environment, making it suitable for homes with children and animals. While effective for several foliar diseases, users should follow labeling for recommended use on vegetables, fruit, and ornamental plants to manage grey leaf spot and related conditions.
Safer Brand Garden SG5450 Fungicide Ready-to-Use Spray
Safer Brand Garden SG5450 employs sulfur to combat fungal diseases, including powdery mildew, black spot, rust, and leaf spot. The ready-to-use spray is OMRI Listed for organic gardening, and its formulation aims to be gentle on plants while protecting a broad range of ornamentals, fruits, and vegetables. It is designed for use throughout the growing season, including near harvest, to guard against grey leaf spot progression.
Bonide 142 Sulfur Plant Fungicide – 4 lbs
This Bonide sulfur product provides broad protection against rust, leaf spot, and powdery mildew. It notes utility for organic gardening and also mentions animal applications, though gardeners should adhere to the label when applying to non-plant targets. The 4 lb size offers extended coverage for larger outbreaks or multiple plantings, enabling ongoing management of grey leaf spot across diverse crops and ornamentals.
Buying Guide
- Active ingredient and spectrum: For grey leaf spot, choose products with sulfur or broad-spectrum fungicides like azoxystrobin-based formulations. Sulfur provides general protection, while azoxystrobin offers systemic movement and deeper protection across plant parts.
- Plant safety and organic options: If you garden organically, look for OMRI-listed products like the Safer Brand option. Natural formulations such as Earth’s Ally emphasize lower chemical residues, though follow label directions for efficacy.
- Target crops and timing: Consider the crops you grow and disease pressure. Apply at first signs of leaf spot or when environmental conditions favor fungal growth (high humidity, frequent drizzle). Reapply according to label intervals to maintain protection without phytotoxicity.
- Application method and coverage: Some products are ready-to-use sprays, while others require mixing. Ensure thorough coverage of both leaf surfaces, including undersides, for best results against foliar diseases.
- Safety and compatibility: Follow PPE recommendations and avoid applying during extreme heat. Verify compatibility with existing fertilizers or other garden products to prevent adverse reactions on plants.
- Resistance management: Rotate among products with different active ingredients to reduce the risk of fungal resistance and maintain long-term effectiveness.