For about 10 days now, a group of 23 farmers from South Africa has been going around the south Indian States telling farmers to be ultra cautious about the genetically modified (GM) seeds, crops and food besides learning from the Indian expertise in agriculture. The group was here on Sunday for an interactive session with organic farmers of Tamil Nadu. The meeting saw exchange of ideas and experiences in farming. Vetavalam Manikandan and other farmers traced the journey of Indian agriculture since Independence through green revolution and the gains of organic farming.