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7 messages
19/08/2012 at 13:27

The cucumber plants in my greenhouse were growing well but started to develop "powdery mildew" which I was told was due to the atmosphere being too moist.I tried to increase ventilation and water carefully.I now have mildew and red spider mite which I know like it hot and dry - you see my dilemma, where is the flaw in the argument? Is there a "dry loving" form of mildew ?

19/08/2012 at 14:32

Does sound odd. Are you sure they're both PM and red spider mite?


19/08/2012 at 17:49

I`m sure of the RSM - an old adversary, as for the PM - white blotches on the leaves which definitely look fungal.

20/08/2012 at 07:58

When I've had PM - or my cukes have had it, anyway - it manifests as, literally, powdery rather than blotches. You might have something other than PM. Here's the sort of thing I usually see:


20/08/2012 at 12:04

The photo looks horribly familiar and having checked the residue is powdery.It is a small house (10`x6`) with 2 cucumber plants and 5 toms. so maybe it is possible to get such extreme variations in conditions that both can thrive ? Anyway I fear the RSM more than the PM so will resume spraying to moisten the atmosphere.Thanks for your efforts

20/08/2012 at 13:43

I did some trials some years ago on organic peppers vs ordinary fed ones. RSM on conventional ones did not cross over to the organic ones and I could only sumise the result was from having Seaweed in the liquid feed.......... why not try a spray?

20/08/2012 at 15:25

Thanks slaphead - will give it a go.

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7 messages