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Lice, whitefly and the like can be treated easily with nettles - simply cut fresh ( not dried - has to sting ) nettles and chop, leave in water for 24 hours and apply using a spray bottle ( make sure to use a fine sieve so it won't clog ). After about five days the water will turn into a fertiliser but won't be scarying the pests away.
PS: Apologies, forgot to mention the container should not be metal.
Useless. I was trying to find out more about a non-chemical treatment for whitefly and link to someone else, but all the webpage did was say 'Done' when I couldn't read it. Really sometimes these things are so difficult.
How true, more research for alternatives should be done by the publishers.
I've heard that placing pots of growing mint in the greenhouse will deter whitefly. Is this true? Spud.T


I have tried boiled rhubarb leaves and added soft soap to the strained liquid. It works for black fly also.
Before using thiacloprid, imidacloprid, acetamocloprid or any other neonicotinoid pesticide, I recommed visiting the Buglife website, to read their report summarising independent research on neonicotinoids. They kill bees & other non-target insects - eg. butterflies etc. Miniscule amounts impair the ability of insect to function resulting inevitably in death. Also, seek out the fact sheets from the US environment agency -you may get a shock! We used to manage without them & can now.

I've just noticed that there are small whiteflies on my parsnips and some of the leaves are curling. The solution above refers to soap based solution - should I just dilute washing up liquid with water and spray? If yes, what's the ratio? I'll also try the nettle solution.

No No, not detergent. Detergent will burn the leaves of plants. Use soap that comes in a bar. Or those soap flakes you can buy for washing woollen things by hand. Just mix it as if you were washing your hands in soapy water. But don't spray it onto leaves infull sun. Again, it will burn them.

I've got it on my broccoli but it doesn't harm it, just means you have to wash the leaves carefully and rub it off, if you eat the leaves too. It also seems to be living in my compost bin, every time I open the lid a swarm of white fly fly up. Or is it something else? We're organic so I could try a soap spray but should I do something about the bin? Advice please.
For the last few years I have had a whitefly problem on brassicas. In June I was invaded suddenly by greenfly too but I decided to allow nature to help. Within a few weeks all the greenfly were gone and the whitefly never got a real hold (yet!). Is it co-incidence that I have a large wasps nest in a small outbuilding on the veg garden? It's about the size of a football cut in half and looks magnificent. As it was out of the way of the family I left the wasps alone. Co incidence perhaps but are the wasps actually keeping other pests at bay?

I believe wasps eat huge quantities of insects early in the year.  They don't come looking for your jam sandwiches until midsummer and autumn.

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