Seeing predators in the garden is second only to seeing blooms! I've spent an hour every few days these past 3 months squishing aphids by hand, trying not to damage the soft new growth at the same time. Doesn't seem to make much difference though as they always seem to be back. I've found that aphids seem to be all over more vigorous roses with red leaves/stems while completely avoiding new foliage thats green (Jude the Obscure had almost zero aphids this year while James Galway was being eaten alive).