Dead Plant Mystery

We were asked to solve a mystery as to why 4 plants that were part of a hedge line had died after growing well for the last 6months, and had doubled in size since they had been planted before dying.

A quick look revealed that they had been ringbarked about 10cm above the stem. This could be done by rabbits, borer or grass grub, however the damage didn’t look right for any of these options.

A clue to what may have actually happened was the Kikuyu grass in the photo. Some further questioning revealed the true cause of the ringbarking.

See if you can work it out from the clues and leave your answers in the comments below.