Please put me right on this?

[tim]

We religiously mist our cus against RSM. But the mist is dry in moments.

How does this deter RSM??

[tim]

[pakaba]

hi
I am guessing that it just increases the humidity in the GH and around the plants, and I guess that RSM like really dry places, and not humid.... i am only guessing, and hoping....   I think i might be over doing it a bit in my GH as i walked in the other morning as within moments my glasses had steamed up!

P.

[tim]

Love it when it does that - like the Botanical Gardens!

Yes - humidity - but it evaporates in moments in a well ventilated 'house??

[moonbells]

I thought humidity was a measure of the evaporated water. If the water is still vanishing, that will cause the humidity rise you want. If you spray and the water stays put, it would mean you're already at 100% saturation of the air with the water, so no more will disappear.  You can't see water-saturated air. Clouds are condensed vapour.

I find shallow trays (ie pot saucers or recycled fruit tubs) full of water in the conservatory work well - the water will evaporate when needed and the humidity happily rises to 100%. I bought a dial humidity meter for about £3 which tells me when I'm at max.

When you ventilate well, the humidity escapes and drier air replaces it, so you've got a bit of a dilemma. If you have plastic tubs going spare, they can be left filled with water to help keep the humidity up. I don't have vents in my C (poor design chosen by previous house owner!) and so it gets very humid very fast. Don't ask me why it still gets RSM...!  The larger the surface area of exposed water the better. Pebble trays are excellent for raising humidity - huge surface area!

moonbells

[tim]

Aha!!

Yes - we ventilate hugely. But there is a plastic membrane on the floor which holds all the watering overflow until it evaporates. So 'spose that's enough?

[moonbells]

Could well be enough to have the sheeting. Those little cheapo humidity dials are handy, if you can get one. Gives you an idea of how much you need to mist or damp down. Hate to think how many miles they've been shipped...

moonbells

[tim]

Indeed!