Question: asking about name of some fungicide use for treating the potato seeds before planting. 
Answer: --please treate the seed with carboxin or maneb 2-3 gram per liter or trichoderma viridi 10 gram per liter of water. soak the seed on that water for 20-30 minutes and then  spread the seeds in a polythene sheeth or gunny bag for 2 days. on the 3rd day you can sow the seed in the  furrow by maintaing 10 cm dictance between 2 seed. before sowing you can directly apply insectice such as azadirachtin 2ml/liter or neem oil 5ml/liter or flubensik 1ml/liter  in the furrows befor 1 or 2 days of sowing.