 And then if you plant the same thing the next year, you've got existing bugs, and then they just keep on getting worse and worse and worse and worse. So you need to separate your crops and not have too big a patch. And this is easy in a home garden, unless you have really an obsession with growing green beans or tomatoes. A lot of people have obsessions with growing tomatoes, so that's a bit of a struggle on that one. But if you break them up, then it's harder for the pest to move from one patch to the other.