Ageratum: lower leaf purplish-black discoloration

April 01, 2014
Written by Brian E. Whipker, Floriculture Extension & Research, NC State University
April 1, 2014 — Low substrate pH induced micro-nutrient (Iron/ Manganese) toxicity is discussed on ageratum (Ageratum houstonianum) in this week’s e-GRO Alert.

During an experiment with ageratums (Ageratum houstonianum) at NC State University, we noted that  the lower foliage developed purplish-black spotting on the lower leaves of plants grown with a 250  ppm N fertilization rate.  In an effort to diagnose the cause of these symptoms, the substrate was tested for pH and EC.

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