For whatever reason, I've never had potato bugs on tomato plants, in fact except for one year when I got some green caterpillars (which I think came with the starts) I've never had any bugs on tomatoes. Even potato bugs can be largely thwarted by delaying planting until mid-June (this is in northern New England...dates will obviously vary by planting zone).same bugs that hit taters will also consume tomatoes, eggplant, or anything else in the nightshade family!
I plant mine with my homemade planter and dig with my homemade diggers,---well, cept this year, diggers are useless in the muddy ground so dug the Norlands with a hoe and shovel. Hope the Pontiacs and Kennebecs wait til the ground dries out. So far they are still somewhat green stemed yet, so it will be a while before they are ready.
As for messing around them when they are growing and taking small potatoes,-----DONT! Why?--cause the plants will only set so many tubers and if you take some the plant will not set another one to replace the one you took! ---- tried that one year as a test and actually that plant stopped doing anything and at harvest time it didnt have anything big enough to use! ---- IF ya gotta have potatoes that early, plant Norlands and leave them alone til the tops die down!
I agree on resisting the temptation to grab some potatoes early.