Forum home 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.



  • FairygirlFairygirl west central ScotlandPosts: 39,390

    That's one of your worst jokes yet Verd image image

    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 image

    It's a place where beautiful isn't enough of a word....

  • pansyfacepansyface PEAK DISTRICT DerbyshirePosts: 18,626

    Maybe whitefly damage?

    Apophthegm -  a big word for a small thought.
  • The leaves look fine on top, its just on the underside!

    Its not the remnants of slugs or snails.

    Any more suggestions?


  • plant pauperplant pauper Posts: 6,234

    Verd that was shocking!

  • pansyfacepansyface PEAK DISTRICT DerbyshirePosts: 18,626

    Red spider mite?

    Apophthegm -  a big word for a small thought.
  • floraliesfloralies Haute-Garonne SW FrancePosts: 1,361

    Downy mildew perhaps?

Sign In or Register to comment.