Natural Fungicide for Plants: How to Get Rid of Powdery Mildew and More

Whether you’re a passionate gardener or a professional grower, managing plant diseases caused by pathogens is crucial. Pesticides, though typically associated with harmful synthetic chemicals, can play a significant role in maintaining plant health. Fortunately, there are natural options like baking soda that can help control pests and diseases, allowing you to achieve organic growing compliance. In this article, we’ll explore everything you need to know about natural fungicides for plants.

What Are Fungicides?

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A fungicide is a type of pesticide that targets fungi. Alongside herbicides (for controlling weeds) and insecticides (for combating insects), fungicides are essential for disease control. Fungi are responsible for significant crop losses worldwide, making plant fungicides crucial in protecting crops.

What Are Common Plant Diseases Caused by Fungi?

Fungal diseases can cause severe damage to plants, making early detection and treatment vital. Some common plant diseases caused by fungi include:

  • Powdery Mildew: characterized by white, powdery growth on leaves.
  • Black Spot: causes dark spots surrounded by yellow on leaves.
  • Rust: results in rust-colored growth on the underside of leaves.
  • Botrytis Blight: leads to the growth of grey, fuzzy mold on decaying flower petals and buds.

Fungal diseases often manifest visible symptoms on plant leaves and thrive in wet, poorly ventilated conditions.

What Natural Fungicide Should I Use?

When it comes to selecting a safe and effective natural fungicide spray, options abound. One excellent choice is Grower’s Ally Fungicide. This product not only combats fungi but also acts as a bactericide. It contains no synthetic pesticides, heavy metals, or residual solvents.

Grower’s Ally Fungicide is a certified organic solution that forms a protective barrier on the surface of plants. It dehydrates fungi and prevents the growth of new spores. This fungicide is safe for bees, has no known phytotoxicity, and is formulated with food-grade citric acid. It can be applied at any stage of plant growth, indoors or outdoors, in greenhouses, or hydroponic systems.

To apply Grower’s Ally Fungicide, either use the ready-to-use (RTU) spray bottle or dilute the concentrate with a ratio of 45 mL per gallon of water. Depending on the situation, spray your plants every 5-10 days.

What Are Fungicides Made From?

While many fungicides on the market are synthetic, there are several naturally derived alternatives. These natural fungicides are environmentally friendly and offer effective protection against plant diseases. Some common active ingredients in natural fungicides include sulfur, copper, horticultural oil, neem oil, and baking soda.

Types of Natural Fungicides for Plants

Natural compounds like sulfur, copper, horticultural oil, neem oil, and baking soda have been used as effective garden fungicides for centuries. They provide protection against a variety of plant diseases and are considered more environmentally friendly than synthetic options.

  • Sulfur: The oldest fungicide, sulfur prevents fungal spores from growing. It is effective against many types of fungal infections if applied early enough.
  • Copper: Copper sulfate is often used as a liquid fungicide before plants are infected by fungi. It kills both fungi and bacteria, but proper dilution is crucial to minimize any negative impact.
  • Horticultural and Neem Oils: These oils are primarily used for pest control and also protect against some viral plant diseases. However, certain tree species may be sensitive to oils, and high temperatures and humidity can increase their phytotoxicity.
  • Bicarbonates (Baking Soda): Baking soda has been used as a natural fungicide for a long time. However, ammonium bicarbonate and potassium bicarbonate are recommended over baking soda due to their effectiveness without additional oils. Baking soda can be diluted in water and applied to plants to combat black spot and powdery mildew.

Integrated Pest Management (IPM)

Integrated pest management (IPM) is a holistic approach to pest control that involves gaining knowledge about pests and implementing effective management strategies. IPM focuses on action thresholds, monitoring and identifying pests, prevention, and control. It prioritizes natural pesticides and fungicides with minimal risks for crop protection.

How Do Fungicides for Plants Work?

Plant fungicides are typically applied as liquid sprays to control diseases. They can also come in the form of granules, dust, or gas, and can be used as mists or fogs in greenhouse environments. Most fungicides require regular application to protect new growth and withstand environmental factors like irrigation and rain.

Fungicides are generally classified as contact or systemic. Contact fungicides remain on the surface of the plant, providing external protection. Systemic fungicides are absorbed by the plant tissue, allowing them to travel short distances within the plant.

Understanding the mode of action and whether a fungicide has single-site or multi-site activity is crucial in selecting the appropriate product. Single-site fungicides target specific pathways or cell membranes of pathogens, reducing the likelihood of toxicity to plants. Broad-spectrum fungicides, on the other hand, provide protection against a wider range of fungal pathogens.


Fungicides play a vital role in pest control and disease management for your garden or growing operation. While synthetic options exist, naturally derived fungicides offer a more environmentally friendly approach that aligns with organic farming practices. Implementing a robust pest control plan, including the use of natural fungicides like Grower’s Ally, can help protect your plants and ensure healthy and thriving crops.

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