Shortly, in a matter of few days, the cacti which looked healthy to me started to look bloated and swollen up. Some even got discoloured, turning yellow. The other few showed signs of rotting. I was devastated. I had watered them well, trowelled them at regular intervals and had even fed them fertilizers. Surely it was some pest that had attacked. I turned to the master farmer for advice. He just smiled. I smiled back perplexed.