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My understanding is that once a plant has been treated with a neonicotinoid all pollen and nectar that the plant produces in the future will be dangerous to bees as it damages their immune system so they succumb to a virus that they usually aren't susceptible to.
Jess, yes for, perennials like Heucheras dig them up now, wash off the roots etc and make sure no eggs or larvae etc. Remain. Then excavate the soil and remove to a tray or box and kill the grubs you see or spread out for the birds. Use fresh soil to replant Heuchera.
However, I do use Provado AND nematodes. Provado during the autumn and nematodes in spring and summer. Works for me.
Thanks Verdun and Mike - Verdun, are you worried about bees being affected by nectar and pollen contaminated by Provado? I have no idea what sort of shelf life it has.
I take your point about commercial spraying concentrations v. domestic, Mike - would be good to know whether Provado lingers and is as bad a sa heavy metal (which can never be broken down or removed), or whether it does eventually break down in the soil and in the plant.
I was hoping to find some info online, but no luck so far.
I was also hoping that a good soaking in Provado now, when the bees are inactive, may do the trick...and by Spring the damn stuff would have been dealt with by nature.
It's hard for me to remove the Heucheras V - they are all interlaced with spring bulbs that are coming up right now, so moving the heucheras would be very difficult without collateral damage
I think I may have to resort to a bit of Provado Do you use it, Mike?
We suffered from Vine Weevil in pots for years, and then got a tip which virtually cured the problem.
Just plant a root of CHIVES in pots and containers and you will have no more root damage !!!!!
Honestly, it works.
Campbell Jones - Ludlow
Thanks Brumbull, glad to hear it works
Jess, I bow to people like Dove who are very caring and knowledgeable about the Countryside.....I try to be too though......but I think using Provado is safer than some are saying. Used in moderation and for specific issues it serves a very good purpose. It also enables us to protect our valued plants.
If we don't use the occasional chemical we will have caterpillars eating everything, vine weevils destroying fuschias and slugs and snails eating everything else.
I usually try the organic way first....slugs are always hand picked.....Heucheras dug up and washed amd soil cleared.....peas fleeced for pea moth and carrots for fly.
Some of the Provado products have been banned, but not the vine weevil treatment. Not sure why exactly ....
Provado does use neonicotinoid insecticides but those are not banned. They are systemic so killing the grubs takes a few weeks/several applications. The UK voted against the EU prohibition as the scientific proof of them affecting bee populations is not there.
Thanks your such a positive response - makes me really happy to see I'm not alone in worrying about thus.
im not anti every chemical under the sun (I occasionally use fungicides on my fruit trees), but when wildlife can be hurt, then I find I'm too reluctant to risk it.
However, watching one's hard work and money wither and die in weeks, due to a pest as serious as vine weevil, is both disheartening and not something I'm willing to stomach.
Chives?! How interesting Julian!
i shall definitely try that first!
Will also follow Verdun's tip on at least removing my gardenia from its pot and checking it for grubs. Shame I can't do the same to my beds...
Roll on Spring and then the little b***ers will get a blast of 5 million nematodes like they've never had before
Has anyone used garlic spray as a repellent for the adults?
interesting article here below on legislation- so proud my country voted against
Thanks Brum -send me a bottle will you Your concoction sounds more lethal than mine!
i already use a home-made spray on roses and it seems to do the job for aphids, but wondering if it'll deter the dreaded weevil adult.
Did it work?
could you still step into your garden and not pass out from the fumes?
Works a treat on aphids - and cats!
Ah, you should be living in Greece or Italy- no neighbour there would give two hoots about garlic fumes over a garden fence
You're so right about hostas - only thing that saved mine was the garlic pong!
I have a small pond and over the years as my frog population as grown ... My slug damage on my plants has vanished . To keep the green fly off my roses I plant under or close to the ramblers and bush roses chives or garlic, it works a treat .
Somebody mentioned a salt water soak and I would have thought that would completely contaminate the soil so that nothing could grow. However, does anybody know if just standing a container in a bowl of water for a day would cause the vine weevil to drown? It certainly works for ants and wood lice.
Really interesting to read all the above.
I've just spent a really boring few hours picking out Vine Weevil grubs from one of my hanging baskets (ferns, fuchsia, bulbs, etc.) . I fed them to my Chickens as a treat but some so small I ended up tipping the rest of the compost for them to find themselves.
In Spring 2012 I planted troughs on my house wall with Heucheras and Carex - they looked wonderful until the autumn when I noticed that I could pick some of the plants up.............all the roots had gone. Dreaded vine weevil. I cleared the troughs, washed all the plant roots and potted up the rescued ones individually. I watered them with Provado and later grew them on and planted them in other containers or in the garden. Touch wood, to date, I haven't noticed any problem with these particular plants.
I haven't used this product since but I will use it again now to sluice the plants I removed from the basket today.
I hadn't thought of Chives but it sounds like a good tip.....I assume it is a bit like garlic keeping away vampires
Just as a PS, my Chickens only get the weevil grubs from untreated plants.