White mold on cucumbers

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Notty1975

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White mold on cucumbers
« on: June 21, 2018, 16:32 »
Hi all been away for a few days and just noticed white mold on my cucumbers I’ve just sprayed with the milk water mix anything else I could do thanks all
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mumofstig

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Re: White mold on cucumbers
« Reply #1 on: June 21, 2018, 17:27 »
Did it get watered while you were away? Mildew always seems to start when the plants are dry at the roots.

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Notty1975

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Re: White mold on cucumbers
« Reply #2 on: June 21, 2018, 18:45 »
Yes them the toms peppers and chillis are all on auto irrigation set at 4am the 3 of these type (Louisa I think) have the mold but the 3 trafalgar have nothing showing

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mumofstig

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Re: White mold on cucumbers
« Reply #3 on: June 21, 2018, 19:00 »
Not that then - weird  ::)

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John

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Re: White mold on cucumbers
« Reply #4 on: June 22, 2018, 10:36 »
I trialled a product called plant magic essence from Greenhouse Sensations that was fairly effective on powdery mildew. 

Biological Control for Powdery Mildew - Allotment & Gardens

Essence Starter Kit - Anti-Leaf Disease Kit


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sunshineband

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Re: White mold on cucumbers
« Reply #5 on: June 22, 2018, 18:31 »
I trialled a product called plant magic essence from Greenhouse Sensations that was fairly effective on powdery mildew. 

Biological Control for Powdery Mildew - Allotment & Gardens

Essence Starter Kit - Anti-Leaf Disease Kit

Interesting John.

I find that a dry atmosphere encourages mildew on cucumber and courgette leaves, not only dryness at the roots. Maybe there was insufficient water to keep the atmosphere around them buoyant?
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Notty1975

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Re: White mold on cucumbers
« Reply #6 on: June 22, 2018, 22:06 »
Do you suggest damping the ground more and adding more trays of water then

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Dr_Pepper

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Re: White mold on cucumbers
« Reply #7 on: June 24, 2018, 23:02 »
Just looking back on notes from a recent plant pathology course we did at work I found the following on powdery mildew info:

Dry conditions help the dispersion of the spores;
Sporulation and germination need high humidity;
2 hours of high humidity can be enough for spore germination
Wetting the leaves can inhibit spore germination

So watering late in the day can exacerbate the problem by giving the fungus that window of high humidity overnight for the spores to germinate; during the day the spores will disperse in the dry atmosphere.

From experience I know that professional organic cucumber growers use potassium bicarbonate sprays to successfully cure powdery mildew on cucumber. It is a 'commodity substance' so falls outside legislation covering plant protection products.
 
Preventative spays of compost teas as John mentions, or plant extracts work if applied regularly to plants before the mildew starts but are unlikely to cure an existing infection (fennel oil sprayed weekly does definitely work - I know growers in Belgium and NL who get really good control spraying it weekly all through the spring and summer). Mineral (paraffinic) oils also work but I think these are for professional use rather than amateur.

Another thing to bear in mind is that some varieties are more tolerant than others, so look for 'mildew-resistant' varieties when choosing seed.

With your picture of the milk spray, I would say make your droplets much smaller if possible so you cover the entire leaf with a fine spray.

Hope that's of some help/interest!

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John

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Re: White mold on cucumbers
« Reply #8 on: June 25, 2018, 00:04 »
Thanks for that really informative and useful contribution, Dr Pepper :)

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Notty1975

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Re: White mold on cucumbers
« Reply #9 on: June 25, 2018, 06:38 »
Thanks for all the helpful comments hopefully will get them sorted now



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