Spots/Bumps on Mint Stems - Knowledgebase Question

Lake Forest Park, Wa
Question by rapreisinger
April 29, 2010
I have a culinary mint plant in a pot outside that I got a few months ago, and some of the stems have gotten orange/bright yellow bumps near the bases, mostly in two rows that go up the stems. What are these? Are they something bad like an infection or insect eggs? Or perhaps rhizomes?

Answer from NGA
April 29, 2010


Mint is susceptible to rust disease. Rust shows up as orange freckles on the lower foliage and stems. You may be able to control it with fungicides but I have better success just cutting off the affected stems. Healthy new growth will emerge from the crowns of the plants. Good luck with your mint!

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