1Central Potato Research Institute, Shimla, 171 001, (UP).
2Central Potato Research Institute Campus, Modipuram, 250 110, (UP).
Information on the Phytophthora infestans mating types and metalaxyl resistance revealed that A2 mating type continued to remain dominant in the hilly areas and sub-tropical plains. Resistance to metalaxyl had crossed the threshold level at most of the places studied.