How to Spray Fungicides

Fungicides are liquids that are applied to the leaves and stems of almost any plant to kill fungal-based diseases such as powdery mildew, black spot and molds. They are readily available to home owners at garden centers and home stores. Fungicides have a variety of active ingredients including copper, sulfur and lime as well as many man-made chemicals. Spray fungicides on plants carefully, since inappropriate application is ineffective, or may even harm the plant.

Garden sprayer
Fungicide
Adjuvant or surfactant

Instructions

- 1
  Read the label on the fungicide carefully to ensure it is formulated for the specific type of diseases your plant has. Many fungicides are broad based and kill many types of fungi, but always read the label first.
- 2
  Open a pump-style garden sprayer and pour in the fungicide using only the amount indicated on the bottle. Dilute the fungicide with water if instructed to do so. Fungicides concentrations are mixed either per plant or for a specified amount of square footage.
- 3
  Open a bottle of spray adjuvant or surfactant, which are oils that helps the fungicide stick to the plant leaves. Add in the amount indicated on the bottle. These substances are particularly important when spraying waxy leaves, such as holly.
- 4
  Close the garden sprayer up and pump the handle repeatedly until you feel resistance. This pressurizes the pump to allow you to spray the fungicide. Shake the sprayer up to mix the contents well.
- 5
  Spray the fungicide mixture onto all surfaces of the plant, including the underside of the leaves, to form a complete protective barrier.
- 6
  Repeat the spraying process every seven to 14 days to treat new foliage that has emerged and to recover old foliage if rainfall has occurred.

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