I’ve used the nematodes but only in pot plants. You need the weather to warm up a bit, I think end of April is good, but the best time Is September when the grubs have all hatched out in the compost. That will see you through the winter if you overwinter plants. It’s really not a good idea to apply a chemical killer such as Provado to the open ground, we don’t need anymore chemicals seeping through to the water tables! Also you can’t use those chemicals on edibles but nematodes are safe. This is a quote from the web site QUOTE
Nemasys Vine Weevil Killer: - environmentally friendly and safe for children, pets and wildlife
Apply to pots and open ground from March to November. This is when the vine weevil larvae are present and the soil is above 5ºC (40ºF). If applying under cover the pest's lifecycle is broken and Nemasys Vine Weevil Killer can be applied at any time, as long as the soil is above 5ºC (40ºF). Apply directly to the soil around the roots, which is where the larvae will be feeding.
To keep a minor problem at bay, one autumn treatment should be adequate. However, for a serious infestation, treat in the spring and again in the autumn. When treating pots take care that the pots are not allowed to dry out.
The nematodes (Steinernema kraussei), seek out the vine weevil larvae and attack the pest by entering natural body openings. Once inside, they release bacteria that stops the larvae from feeding, quickly killing it. They do not stop there. The nematodes reproduce inside the dead pest and release a new generation of hungry infective nematodes, which disperse and search for further prey. Nemasys Vine Weevil Killer will kill larvae present in the area and protect against further larvae damage for up to four weeks.
Nemasys Vine Weevil Killer is available in pack sizes:
Gagzo as far as I’ve read they shouldn’t be a problem in the ground as they dont take over due to other bugs keeping them under control. It is plants in pots that suffer most, at the same time if you suspect vine weevil I’d dig it up & check. Dont know if anyone else knows more about the little nasties in the ground?
A healthy rhodie in the ground will shrug off weevil damage. If you're keeping them long term in pots, make sure the container is big enough and the medium it's planted in is adequate. A good soil based one, not just compost. Plenty of water and good drainage, as well as enough appropriate food.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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This is a quote from the web site
QUOTE
Nemasys Vine Weevil Killer: - environmentally friendly and safe for children, pets and wildlife
as far as I’ve read they shouldn’t be a problem in the ground as they dont take over due to other bugs keeping them under control. It is plants in pots that suffer most, at the same time if you suspect vine weevil I’d dig it up & check.
Dont know if anyone else knows more about the little nasties in the ground?
I live in west central Scotland - not where that photo is...