The Garden Community for Garden Lovers

Cabbage Root Fly

Devon, United Kingdom Gb

I have just removed all my brussel sprout plants as they have been felled by the dreaded cabbage root fly.
The questions now are,what should I do to the soil they were planted in and what and how long before I can plant there again. would appreciate any help as this is my first year gardening.



Ive just read that digging over will make the pupae available for the birds reducing it ahppening so much next year, other than that I dont know

x x x

31 Jul, 2009


If this is a real problem, whenever you plant brassicas, place a cardboard collar around the stem (a piece of flat card three or so inches square, into which you have cut a slit for the stem.) Fitted around the stem this means that the adult fly is less likely to lay her eggs there which hatch and descend to devour the roots.
I also find that mulching heavily around plants with a thick layer of straw or other fibrous compost largely prevents the fly. I don't know if this is because it alters the smell and the flies don't lay eggs, or whether the larvae can't penetrate the mulch. Or perhaps it attracts predators that eat the eggs and/or larvae.
Heavy mulching with straw is also a successful organic method for Colorado beetle on potatoes which we get frequently here, and it really works, again because it attracts predators.

31 Jul, 2009


Hi Flyingkites when growing vegetables it is good to practice a four year crop rotation as this helps to ensure any pests or diseases can't infect the crops from one year to the next. It also makes sense for other reasons... take a look at this page from my blog site for more info

31 Jul, 2009


Thanks all for the info and Moon grower thanks for the link makes good reading.

1 Aug, 2009


You are welcome :-)

1 Aug, 2009

How do I say thanks?

Answer question


Related questions

Not found an answer?