The field investigations were carried out on sandy loam soil at the research farm, Department of Agricultural Meteorology, Punjab Agricultural University, Ludhiana during rabi 2006-07 and 2007-08. Wheat is the premier cereal crop during rabi season in Punjab. In 2008-09, it was grown on 35.26 lac tonnes and per hectare yield of 44.62 quintals. Wheat needs cool climate during early part of its growth and warm temperature at this stage is unfavourable for tillering and promotes several diseases.