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Cabbage stalk weevils

Has any knowledge/experience of cabbage stalk weevils? The little blighters arrived in their hundreds, I think from a seemingly untreated oilseed rape field about 1/2 km away, about 4 days ago. I have heartbreakingly ripped out all of my brassicas except for the cavolo nero that they seem not to go for at all. All the plants are at the skip.
With no brassicas, they seem to be settling down among the nasturtiums. I have no idea if this is temporary or if they will be happy there for the foreseeable. I could rip out the nasturtiums as well but would they then just move on to the next plant?
I'm hoping the field will be harvested in the not too distant future, at which point I'm expecting an massive influx of displace weevils.
Does anyone know what, if anything, I can do other than swish them? And pray that other veggie gardeners nearby - there are loads - are aware and trying to deal with it as well, otherwise they will presumably just breed away happily.
I can find very little information online except for farmers where the advise if zap away with chemicals, which aren't available to individuals even if I did want to use them, which I don't.
It was all going to well, the garden is starting to look fab, and now this. It's a real kick in the guts.
With no brassicas, they seem to be settling down among the nasturtiums. I have no idea if this is temporary or if they will be happy there for the foreseeable. I could rip out the nasturtiums as well but would they then just move on to the next plant?
I'm hoping the field will be harvested in the not too distant future, at which point I'm expecting an massive influx of displace weevils.
Does anyone know what, if anything, I can do other than swish them? And pray that other veggie gardeners nearby - there are loads - are aware and trying to deal with it as well, otherwise they will presumably just breed away happily.
I can find very little information online except for farmers where the advise if zap away with chemicals, which aren't available to individuals even if I did want to use them, which I don't.
It was all going to well, the garden is starting to look fab, and now this. It's a real kick in the guts.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
looks like flea beetle, maybe small weevil?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I have inadvertently discovered a trap, just leave a bit of brassica stalk out and they're all over it. Shake into water, down the loo. I really do hate killing anything but when you've nurtured your seedling, planted with love, got all excited at the emergence of the first little cauli... to see it all go to the skip is just too much.
@Lyn, tiny little holes could be flea beetles? And groups of tiny yellow eggs possibly small white butterfly eggs?
I have my fingers firmly but possibly temporarily crossed, I seem to be on top of the weevils. Interestingly, although most of my gardening friends had never heard of them, the market growers have also been blighted. They lost all their cauliflowers and broccoli, which is no joke as it's their living.
After pulling up (nearly) all of the brassicas, I was surprised to see so many weevils still around. It turns out they love nasturtium flowers as well. Shake a nasturtium flower and you get a handful. So the nasturtiums went as well. This left me with a mere 50 or so to squish a day. I hate killing insects but sometimes it's needs must if you want to grow things.
I did keep my 5 kalette plants. They are too precious, I couldn't bring myself to pull them out, so for about 3 weeks I just kept on checking and squashing. The weevils tended to lurk on the underneath of bigger leaves, and also curl up and fall off as a means of self defense, so there's a distinct knack to turning over a leaf while having the other hand ready to catch!
In the end, I seem to have eradicated them. There will probably be the odd one from time to time but for the last few days I've not found one. The weather may be a factor, it's cool, wet and windy.
I have some cabbage, turnip, swede and sprout seedlings in the coldframe, either with the lid shut or netted with a very fine silk scarf, which has worked to keep most munchies out, and I'll wait till they're a good size before planting them out.