I have what appears to be tracks from an insect or larvae on my cabbage leaves. However I can't find the culprit, so any ideas as to what is causing the damage and any solutions would be appreciated
Sounds to me like it's snails. This sounds strange but you can put any brand of beer in old tops of jars and place them in the garden around your plants and they will crawl in the the beer and get so fat they will explode(?). I know from experience, you can sprinkle salt around you base of your plants, they will crawl around the salt and they will desolve. Sounds strange but true.