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5 Home Remedies for Fungal Diseases in the Garden

By: Garden Gate staff
Are blackspot and powdery mildew getting to your plants? Check your kitchen for these common ingredients. Here are five quick recipes to fight fungal disease.

5-ways-to-fight-garden-fungus-powdery-mildew: Powdery mildew is a common problem on plants like garden phlox (Phlox paniculata).

Fungal diseases in the garden

There really is a fungus among us. Several, actually. Black spot, powdery mildew and damping off are all common fungal diseases that every gardener has to deal with from time to time.

Of course, you can choose plants that are resistant to fungal diseases, and cleaning up fallen leaves and spreading fresh mulch every spring will help, too. But sometimes it’s not enough. However, a quick sweep through your kitchen cupboards, and you might find just what you need to fight against these persistent diseases without chemicals. All of the recipes here are nontoxic and won’t harm kids, pets, wildlife or insects. Plus, they’re inexpensive and made from common ingredients, so you might not even have to make a trip to the store. Scroll on to learn more about making each recipe.

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dwp-fungus-fighters-chamomile-tea: Steep a cup of chamomile tea in hot water for yourself, then soak the used bag in cool water and apply to seedlings to prevent damping off.

1) Prevent damping off with chamomile tea

When you’re starting seedlings, you hate to see them die from damping off — when the tops of seedlings just fall over because the stem has rotted. Chamomile tea contains sulfur, which fights this fungus.

Recipe

  • 1 chamomile tea bag
  • 1 quart water

How to use

Soak the chamomile tea bag in cool water for 15 to 20 minutes. Mist the solution over seedlings and young plants, or use it to water flats from the bottom.


dwp-fungus-fighters-cornmeal: Sprinkle a light layer of corn meal all around plants susceptible to black spot.

2) Keep black spot at bay with corn meal

This home remedy is said to promote the growth of a good fungus that competes with the fungi that cause diseases, such as black spot. Corn meal gives plants a few extra nutrients, too!

Recipe

  • ½ cup cornmeal per plant
  • Bark mulch

How to use

Sprinkle ½ cup of corn meal around every plant, then cover it with a layer of bark mulch.

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dwp-fungus-fighters-cinnamon:Just a bit of cinnamon rubbed onto the leaf can control fungal leaf spots.

3) Fight fungal leaf spots with cinnamon

Orchid growers use cinnamon to fight fungal leaf spots. It is also useful to stop damping off in seedlings.

Recipe

  • Ground cinnamon

How to use

  • Dip your fingertip in ground cinnamon and rub it gently over the area affected by leaf spots. Don’t use too much, though, as it can burn the leaves.
  • To prevent damping off, you can sprinkle cinnamon lightly over the surface of potting mix when starting seeds.

dwp-fungus-fighters-milkl:Mix milk with water and spray to the point of runoff to prevent fungal infections.

4) Prevent powdery mildew with milk

It’s hard to believe that something as mild as milk could fight fungus, but it does. The theory is that it coats leaves so spores can’t embed themselves in the leaf surface, although proteins or lactic acid may play a role, too.

Recipe

  • 3 cups water
  • 1⁄3 cup milk, whole or skim

How to use

Shake this mixture well and spray it on the plants until the leaves drip. When you’re done, discard the leftovers. This spray can help cut down on powdery mildew if you treat plants before you see symptoms.

Try it on garden phlox (Phlox paniculata), bee balm (Monarda didyma), cucumbers and other vine crops. Unlike some fungicides, it’s safe to use on plants with fuzzy leaves. (And no, it doesn’t smell!)

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dwp-fungus-fighters-bakingsoda:Spray both the top and bottom sides of leaves to get the best disease control.

5) Baking soda & soap can control black spot

If you love roses (Rosa hybrids), you dread the arrival of black spot. Here’s something to help keep this condition at bay.

Recipe

  • 1 quart water
  • 1 tsp. baking soda
  • ½ tsp. liquid soap (Use mild soap, such as Ivory®, not detergent, which will harm plants)

How to use

Combine the listed ingredients in a spray bottle, shake it thoroughly and apply to the tops and undersides of leaves. Use it on cloudy days or in the evening, as this mixture can burn foliage on a hot, sunny day. It works best if you spray plants before you see symptoms, although if the leaves already have a few blotches, it’ll keep black spot from getting worse.

Published: Aug. 7, 2018
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Product Recommendations

Here are some supplies and tools we find essential in our everyday work in the garden. We may receive a commission from sales referred by our links; however, we have carefully selected these products for their usefulness and quality.

Related Tags

disease diy garden basics how to plant protection

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