There seem to have been more whitefly around in the past couple of years, even flying out of brassicas in the middle of winter, but I never have a problem with them in the greenhouse.
I always grow a few Tagetes plants - French marigolds - in the greenhouse border and it keeps them away. This is usually mentioned in articles about companion planting and it definitely works.
PREVENTING WHITEFLY IN GREENHOUSE
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PLUMPUDDING
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alan refail
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Plumpudding
That's because they are different whiteflies altogether. I presume if you grow brassicas inside (greenhouse or polytunnel) you could get cabbage whitefly. I grow a lot of brassicas in the tunnel all year round and have not noticed any - but, as I have mentioned on the topic before, I have never seen any brassica whitefly in this part of Wales.
For greenhouse whitefly tagetes or French marigolds do seem to work. I always have some of the latter and no whiteflies, but perhaps they wouldn't have come anyway - but the flowers look pretty.
Click on the RHS links above for more info.
Alan
That's because they are different whiteflies altogether. I presume if you grow brassicas inside (greenhouse or polytunnel) you could get cabbage whitefly. I grow a lot of brassicas in the tunnel all year round and have not noticed any - but, as I have mentioned on the topic before, I have never seen any brassica whitefly in this part of Wales.
For greenhouse whitefly tagetes or French marigolds do seem to work. I always have some of the latter and no whiteflies, but perhaps they wouldn't have come anyway - but the flowers look pretty.
Click on the RHS links above for more info.
Alan
Cred air o bob deg a glywi, a thi a gei rywfaint bach o wir (hen ddihareb Gymraeg)
Believe one tenth of what you hear, and you will get some little truth (old Welsh proverb)
Believe one tenth of what you hear, and you will get some little truth (old Welsh proverb)
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PLUMPUDDING
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I'll have to try growing some brassicas in the greenhouse and see what happens.
I must say I also grow some tagetes outside among the veg in summer and don't have a whitefly problem, but only notice them in winter when there aren't any flowers about.
I must say I also grow some tagetes outside among the veg in summer and don't have a whitefly problem, but only notice them in winter when there aren't any flowers about.