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PROBLEM WITH MY BASIL?
in Fruit & veg
I grow my basil in the poly tunnel and for a few years I have had good success with a lovely y quantity that I use for my pasta cooking and especially for making my own pesto.
This year I don't know whats causing it, but I have had to discard so many of my basil leaves as they have a silver like colouring on the underside of the leaves.
Perhaps there is nothing wrong with this and the leaves can be used, but I have aired on the side of caution. Nevertheless, is there anybody on the forum who may know what causes this and/or where I maybe going wrong?
Your advice would be appreciated.
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That's one of your worst jokes yet Verd

Is it uniformly silvery Mark, or a trail of silvery threads which could be leaf miner?
The weather has been difficult this year too, so I'm wondering if it could be a dampness issue - poor air flow, especially if you have lots of planting, and it's causing a mould of some kind? Basil's usually quite trouble free in the pest department, but wet is certainly a big enemy.
I'm sure someone else can offer further advice or suggestions though
I live in west central Scotland - not where that photo is...
The leaves look fine on top, its just on the underside!
Its not the remnants of slugs or snails.
Any more suggestions?
Verd that was shocking!
Downy mildew perhaps?