I'm doing my best to attract beneficial (i.e., predatory) insects to the garden by planting flowers like yarrow, which is also quite pretty. I guess the tiny predators like tiny flowers. I see tons (probably hover flies but hopefully some predatory wasps too) flying away when I walk by, so I think it's working.I think the birds help too, but even birds don't eat the harlequin bug (in blurry picture below, on a cauliflower). It concentrates chemicals from the cabbage family plants it prefers to make itself taste bad. This one got squashed. I read roly polies eat the eggs, and there are plenty of those so I hope they are eating them!