My oregano has wound up with some type of fungus or something turning the leaves black. What causes this and can it still be used? Advice needed?
I would suspect the four line plant bug.
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I agree with the 4 line bug answer from @Hillbillyhort . I have them here and oregano seems to one of their favorites. Damage looks like your photos.
They are around until late spring / early summer if I remember correctly. After that you can cut back oregano to get some fresh clean growth for drying.
Is that an every year thing for you? A lot of wasted crop.