Flaming May

Not everything I try in the garden works, but my Japanese acer is doing what I intended, providing a flash of fiery red amongst the greenery:

But over on the box hedges I am losing the battle with the caterpillars. What has become a more or less daily disgusting task of squishing them never seems to reduce their numbers; I see other box bushes around the area (including one at the church) reduced to sticks by their attentions. Left to their own devices, the beasts will carry on until the box is destroyed completely, and any other creature that might use it will be bereft, including the box moths themselves. Just like human beings in our relationship with the earth as a whole, perhaps. I am investing in a pheromone trap to grab the adult moths and break into the cycle: that will, all being well, deal with cydalima perspectalis, but what might manage homo sapiens?