Real World Gardener Powdery Mildew on Cucurbits in Plant Doctor

March 22nd, 2019


Fungal Problems of Cucurbits: Cucumbers, Zucchini, Squash, Pumpkin, Watermelons and Rockmelons.

You might think that it’s only hot and humid weather that brings out this particular fungus to the fore. 

But no, not only is this fungal problem not host specific, but it can blight your plants, both edible and ornamental during a wide temperature range.

Why is that? You might ask.


Powdery Mildew on Cucumber Leaves

Let’s find out

I'm talking with Steve Falcioni from


LIVE:Powdery Mildew on Cucurbits_13th March 2019

Powdery mildew is the main fungal disease affecting cucurbits. It looks like a white coating over the leaves and stems of the plants.

Powdery mildew has an effective temperature range of 10 – 30 C and can attack just about everything in the vegetable garden as well as your annual flowers or perennials such as Dahlias. 

eco-fungicide-group-LR.jpgPreventative spraying is best if you have it year after year especially as spores can germinate in some districts all year round.

There’s plenty of preventative treatments, some homemade, others commercial. 

  • Full cream milk works best in sunny weather. Bi-carbonate of soda works reasonably well.
  • Sulphur can be used but it will burn the plants on hot days and also kill off any beneficial insects.

The best solution is Potassium bi-carbonate which is sold as eco-fungicide.

 Under a microscope, potassium bi-carbonate affectively kills off the fungus in 5 minutes.

  • You may find that rotating your choice of treatment gives you the best results with this fungal problem.

If you have any questions either for me or for Steve, drop us a line to or write in to 2RRR PO Box 644 Gladesville NSW 1675

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