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10 messages
24/05/2014 at 10:22

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. 

24/05/2014 at 10:24

Sounds like whitefly 

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

24/05/2014 at 10:38
24/05/2014 at 10:48

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.

24/05/2014 at 10:49

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.

24/05/2014 at 11:01

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.

  

24/05/2014 at 11:08

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

24/05/2014 at 12:04

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

KEF
24/05/2014 at 12:28

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.

24/05/2014 at 12:36

Hello, Lily....welcome aboard.

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10 messages