Tiny white insects in greenhouse

I have noticed for a few weeks now I have tiny white insects in the greenhouse.  They are on the plants and on the soil around the base of the plants.  They are now on soil around my tomato plants.  Any ideas what is causing this and what can I do to get rid of them. 



  • DovefromaboveDovefromabove Central Norfolk UKPosts: 43,618

    Sounds like whitefly image

    Info here http://www.rhs.org.uk/advice/profile?PID=193 

    No-one knows if you've done your housework, but everyone knows if you've done your gardening !
  • Pottie PamPottie Pam Posts: 887

    French marigolds planted in the greenhouse worked for me Lavender Lady. I think to be effective they have to be planted in the soil that the plants are growing in.

  • Orchid LadyOrchid Lady Posts: 5,800

    You could also put some Marigolds in the GH, that's what I've done so far and (touch wood) I haven't had any.  White fly don't like the smell of marigolds so stay away, I'm not sure they will get rid of the current ones though.

  • Anyone wonder why marigolds work to deter whitefly?

    They contain pyrethrum, which is extracted & used as a commercial spray. When you rub the leaves of marigolds between your fingers, they exude a very pungent smell.....this is the smell of pyrethrum.

    Btw, while marigolds will deter whitefly, it won't kill the ones you already have. Hence I recommend those yellow sticky strips.


  • Orchid LadyOrchid Lady Posts: 5,800

    Thanks David, I did wonder why image I don't like that smell and not overly keen on Marigolds but am growing them as a companion plant for my tomatoes image

  • lily1lily1 Posts: 2

    If you want to try a spray most greenfly sprays will also sort out the white fly.

  • KEFKEF Posts: 8,915

    If I don't put marigolds in GH I cut some curry plant and stand it inside, aphids don't seem to like the smell of that. I also have sticky yellow traps so I can see what might have sneaked in.

  • Hello, Lily....welcome aboard. image

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