Last year my spinach crop was mostly decimated by the time I figured out that it wasn't blight but a creature that was harming it. But once you know what to look for, the signs of leaf miner are obvious and unmistakable.
The trail of a leaf miner in chard. |
Leaf miner damage to a beet seedling |
Leaf miners aren't a big deal once a plant is established, if you don't mind a few blemishes (and the memory of a gross larva) in your greens. But when plants are young, they can decimate the crop of a small home garden.
Now I know better than to let them get out of control. I keep them in check by rubbing the eggs off the leaves before they hatch. The eggs are easy to spot - tiny tight rows of tiny white eggs on the backs of the affected crop.
A row of leaf miner eggs on the back of a chard leaf |
I have raised beds so I just take my coffee outside in the mornings and sit on the walls while turning over leaves and rubbing off the eggs. There are usually a couple patches of eggs on the backs of each leaf of my spinach, chard, and beets every other day or so, so that would be a lot of little grubs eating up my food if I didn't get after them. Maybe after a season or two of management they'll be less prolific, but I don't mind the task.
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