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September 2019 – Vol. 102, no. 3

Kapa-kapa (Medinilla magnifica Lindl.) is a commonly cultivated flowering plant known for its magnificent cluster of flowers with large pink bracts. In the wild, this plant grows with its roots attached to other plants, but in gardens, it is usually grown with its roots anchored to the soil. Although this species is naturally endemic to the Philippine archipelago, it is now also grown in some temperate countries. The bioherbicidal activity of kapa-kapa was studied for the first time. The acid-hydrolyzed extract of M. magnifica showed significant herbicidal activity. With a relatively low LD50 value of 64.69 ppm, it has great potential for commercial use for agriculture. This can be attributed to the fairly high amount of phenolic compounds in the extract.

(Photographs courtesy of Antonio L. Rayos, Jr., Plant Biology Division, Institute of Biological Sciences, University of the Philippines Los Baños, College, Laguna, Philippines)

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