Posted: 16/07/2013 at 16:21
Leafcutter bees do much more good than harm for gardeners by pollinating.
Insecticides are indiscriminate & very wrong. The 'swish away' comment just daft!
-My experience is that the bees seem to prefer the leaves of St. John's Wort (Hypericum).
S.J.W is a nice plant itself & grows very readily.
Gardeners worried about their roses might try planting some SJW around & see what happens.