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DIY Powdery Mildew Spray


  • 1 liter water
  • 1/2 tsp baking soda
  • 1/2 tsp neem oil - preferably with Azadirachtin
  • Few drops soap - as natural as possible


  • Combine ingredients in a spray bottle & shake vigorously - add a few more drops of soap, if ingredients don't incorporate
  • As always, test spray a leaf and wait 24-48 hours before spraying the entire plant/garden.
  • Remove the most badly affected leaves & spray the remaining leaves liberally. You may need to shake the bottle periodically to mix.
  • Repeat spray weekly through the hot months to treat & prevent powdery mildew.