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Ageratum: Lower leaf purplish black discolouration

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 250ppm N fertilization rate.

In an effort to diagnose the cause of these symptoms, the substrate was tested for pH and EC. Tests indicated that the electrical conductivity (EC) was 3.81 mS/cm [saturate media extraction method (SME)]. Benary suggests growing ageratum by fertilizing with 100 to 150 ppm N weekly, while PanAmerican suggest higher levels of 150 to 200 ppm N weekly.

Click here to read the complete e-Gro Alert report written by Brian E. Whipker at egro.org (PDF)