Flea beetles are fun the trap - get a small plank and coat it with engine grease, then pass it just above the plants. The beetles will jump up as you disturb them and get stuck to the board. You could do it with yellow sticky traps too if you have them - I won't have yellow sticky traps on my place as they trap beautiful things like bees, hoverflies, ladybirds etc - all the goodies as well as the baddies.
Another way to get the flea beetles, if you have children, is for them to catch them and squash them. One of my sons loved to do that - and no, he hasn't grown up into a serial killer