Hot summer sunshine can burn the leaves so that's probably what you're dealing with. Delphiniums have rather tender leaves. You can prune these leaves off your plants. While you're at it, check to see if there are black, brown or rusty colored spots on the leaves. These types of little spots can indicate fungal diseases. Pruning them off the plants will help keep the disease from spreading. Or, you can use a general purpose fungicide if you find the tell-tale signs. Best wishes with your garden!
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