A reader wrote to us with a very simple question a little while ago: what effect do Catawba worms have on pecan trees? Nothing else was written, so we aren’t sure if the reader is dealing with Catawba worms in some way, or if perhaps he is just interested in this one very specific question. Regardless, it’s a slightly puzzling question to be interested in because Catawba worms should have no effect on pecan trees. So, the answer to our reader’s question – none – is perhaps the easiest we’ve ever supplied.