Black Streaks on Pepper Stems: Pests, Disease, or Normal?

Black discoloration at stem joints on peppers can be normal woody tissue, but combined with worms and aphids, it signals trouble.

Immediate Actions

Spray Sevin (carbaryl) every 7 days for worms and aphids; cover leaf undersides.
Hand-pick visible larvae.
Monitor for Phytophthora stem rot (unlikely if plants otherwise healthy).

Aphids cause blossom distortion and drop. Control aphids to improve fruit set. Plant hormone sprays may help blossom retention.

Replace with fresh plants in sterile potting soil.

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