The larvae underneath will do the damage though @LilyW - they eat through roots, which is the main problem with v. weevil. The adults can be present all over a garden, and the main problem is aesthetic, ie notching to foliage. It's the young which do the real damage, although eliminating any adults when you see them helps with the inevitable reproduction. As @KeenOnGreen says - plants like Heuchera are far more vulnerable in pots than in the ground, but if you get them in time, and thoroughly wash all the soil off the roots, they're usually fine after re planting. I didn't have them here until I bought a very nice sedum, which turned out to be the source. The layer of grit would have to be pretty thick, as @Palustris says - a thin layer doesn't stop them in my experience.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
Yes @LilyW I'd also be interested to know if that worked.
I'm going to try the same thing on my gooseberries and redcurrants this year to see if I can diminish the sawfly larvae emerging. They are in raised beds, so it shouldn't be too difficult to do.
Bee x
Gardener and beekeeper in beautiful Scottish Borders
A single bee creates just one twelfth of a teaspoon of honey in her lifetime
I intend to leave it in place all season, with just a layer of bark chips on top to keep it there. Each bush is in a bed 1.2m square so the larvae will have a long way to travel to get out at the edges. I accept some will though.
Bee x
Gardener and beekeeper in beautiful Scottish Borders
A single bee creates just one twelfth of a teaspoon of honey in her lifetime
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The adults can be present all over a garden, and the main problem is aesthetic, ie notching to foliage. It's the young which do the real damage, although eliminating any adults when you see them helps with the inevitable reproduction.
As @KeenOnGreen says - plants like Heuchera are far more vulnerable in pots than in the ground, but if you get them in time, and thoroughly wash all the soil off the roots, they're usually fine after re planting. I didn't have them here until I bought a very nice sedum, which turned out to be the source.
The layer of grit would have to be pretty thick, as @Palustris says - a thin layer doesn't stop them in my experience.
I live in west central Scotland - not where that photo is...
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
I'm going to try the same thing on my gooseberries and redcurrants this year to see if I can diminish the sawfly larvae emerging. They are in raised beds, so it shouldn't be too difficult to do.
Bee x
A single bee creates just one twelfth of a teaspoon of honey in her lifetime
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
Each bush is in a bed 1.2m square so the larvae will have a long way to travel to get out at the edges. I accept some will though.
Bee x
A single bee creates just one twelfth of a teaspoon of honey in her lifetime