When do sawflies (rose and berberis) stop breeding?
I have been plagued with both this year, on the roses for the first time. My berberis are on their third set of foliage and picking them off them and the rose leaves is an endless battle I’m clearly losing. Please tell me when this will be over!
When they finally stop multiplying, I plan to clear up underneath and scrape off and bin the mulch around the plants to try get any over-winterers, then remulch with pine bark chips (allegedly a hostile environment for the grubs) but is this a waste of time? How do you cope/defeat them?