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in : Problems: Roses
Young rose leaves nearest the bud curl up overnight; after a week, small green caterpillars hatch and start to strip the leaves.
The rose leaf rolling sawfly injects a chemical into young rose leaves to cause them to curl protectively around her eggs. Within a week the eggs hatch into green caterpillars that start to eat their home. In mid-summer, leaving behind skeletonised foliage, they crawl down into the soil to overwinter.
When small numbers of leaves are affected, remove and destroy the tubular foliage. With large numbers of leaves, they are best left or the rose will suffer. In winter, carefully fork over the soil around the base of the rose to expose the larvae to hungry birds, but don't damage the roots.
In the case of large infestations, try spraying with thiacloprid insecticide, but there's no guarantee that it'll reach the well-protected larvae tucked up inside the leaf tubes.
24/11/2011 at 15:28
This feature really helpful, I did find these nasty little critters on one of my roses, I killed them, hoping now that I managed to get all of them.
16/04/2012 at 16:26
We had a lot of these sawflies dancing in groups in the garden last spring. We didn't know what they were until many of our rose bushes were affected with leaf curl and we had to remove a lot of leaves. The bushes recovered well in the end. This year I am armed and ready with a bug spray which is for sawfly amongst others. What it doesn't say is when you should use it. Can the bushes be sprayed to prevent the eggs being laid or should I wait until the leaves start to curl?
16/04/2012 at 17:01
You can spray when you expect the eggs to be laid, or on first sighting of curling. That way, you will hopefully get the sawfly as they hatch and limit damage.
19/05/2012 at 22:39
hiya my tea roses is dropping leaves what could this be its in a large container.
20/05/2012 at 00:21
My first thought would be dryness at the roots - are you keeping the container well watered?