White eggs and tracks on our Swiss chard, thoughts?

Hello Ju Blanc There are Leaf Miner Flies larvae inside. They make tunnels, eat chlorophyll until they grow pupae, then emerge as adult flies by boring holes out. This interesting insect is so devastating and difficult to control because you can't see the adults. So, read details of fecundity of this pest in plantix library that is available by clicking on green link and know appropriate control measures 😊