I have a problem with some black spots on the leaves of some vegetables. These are not the same black spots as those describe as being found on rose bushes. The spots I have are shinny black spots, almost tar like, on both the under and top sides of the leafy vegetables in my garden. The spots are on my chard and lettuce but not on my tomatoes, squash, and cucumbers.
There are no legs associated with these spots. I can pick/scrape them off and they're hard, like a dried resin, or tar. There's no yellow or brown discoloration around the spots. Some spots have very distinctive edges while others sort of fade out, like a mold/mildew.
The garden is newly planted and we've had unseasonably coolish weather the last few weeks (for Sacarmento, CA.) I water each day at 5:00 am for about 15 minutes. I use a drip sprinkler to broadcast the water.
I've never seen these spots before. My gardening problems usually involve snails and earwigs. Any help is greatly appreciated.