13. August 2012 · Comments Off · Categories: General

Powdery Mildew is one of many fungus diseases that can affect plants.  It overwinters in plant debris and spreads through spores in the spring time.  Although it can make your plants unsightly and stressed, it is rarely a death sentence for them.  

It looks like patches of white or gray spots on the leaves and buds often resembling powder on the leaves.  Like most molds, spores are formed and spreading occurs especially in high humidity and moderate temperatures. The spores are spread through wind, splashing of raindrops or by insects when the conditions are conducive for growth of mold. Infected leaves can become distorted, turn yellow and fall off prematurely.  It can also stop buds from opening and affect the taste of the vegetables or fruits of the plant that has it.

 There are ways to reduce or prevent powdery mildew and other fungus problems in your garden.

  •  It is always best to use plants that are resistant to fungal diseases.   

  •  When you must plant non resistant plants, put them in locations that aren’t low and shady ~whenever possible. 

  • Always allow enough space between plants for proper circulation. 

  • When watering saturate the soil beneath the plant instead of wetting the leaves.

  • Water early in the day so the plant and soil beneath have time to dry out before night time.

  • Avoid watering in the evening or night time since this is when cooler temperatures make growth of mold more apt to occur.

  • If you do find evidence of mold beginning on plants, remove the affected leaves and dispose of them (not in your compost) away from your garden so it will not spread to other susceptable plants. *One good thing is that powdery Mildew is host specific. ex… lilac powdery mildew will not infect rose bushes etc… 

  • Proper cleaning of gardening tools that have been used on infected plants is essential to reduce spreading of the disease. (use a solution of 4 parts water to 1 part bleach)

  •   If despite  your efforts powdery mildew  or any other plant fungus persists, you most likely will need to apply a fungicide. There are remedies you can mix yourself or you can buy fungicides.  These formulas will do the trick as well as prevent molds from returning or ever beginning at all if used preventively at the start of the season. 

GreenCure is a highly effective antifungal product for many plant fungus diseases and is approved for use in organic gardening.